easy A solid disk rotates in the horizontal plane at an angular velocity of 0.067 rad/s with respect to an axis perpendicular to the disk at its center. The moment of inertia of the disk is 0.10 kg · m2. From above, sand is dropped straight down onto this rotating disk, so that a thin uniform ring of sand is formed at a distance of 0.40 m from the axis. The sand in the ring has a mass of 0.50 kg. After all the sand is in place, what is the angular velocity of the disk?

Answer:

Work done by external force is given as

[tex]Work_{external} = mgLsin\theta + \mu mgLcos(\theta) + \frac{1}{2}mv_2^2 - \frac{1}{2}mv_1^2[/tex]

Explanation:

As per work energy Theorem we can say that work done by all force on the car is equal to change in kinetic energy of the car

so we will have

[tex]Work_{external} + Work_{gravity} + Work_{friction} = \frac{1}{2}mv_2^2 - \frac{1}{2}mv_1^2[/tex]

now we have

[tex]W_{gravity} = -mg(Lsin\theta)[/tex]

[tex]W_{friction} = -\mu mgcos(\theta) L[/tex]

so from above equation

[tex]Work_{external} - mgLsin\theta - \mu mgLcos(\theta) = \frac{1}{2}mv_2^2 - \frac{1}{2}mv_1^2[/tex]

so from above equation work done by external force is given as

[tex]Work_{external} = mgLsin\theta + \mu mgLcos(\theta) + \frac{1}{2}mv_2^2 - \frac{1}{2}mv_1^2[/tex]

Answer:

The required charge is 3.175 × 10⁶ C

Explanation:

Given:

Potential difference, ΔV = 12.0 V

mass of the car (m) = 850 kg

velocity of the car, v = 25.0 m/s

Height of the hill upto which car traveled, h = 2.3 × 10² m = 230 m

Now, the energy required to accelerate the car from rest to 25 m/s will be

E₁ = kinetic energy of the car = [tex]\frac{1}{2}mv^2[/tex]

on substituting the values we get

E₁ = [tex]\frac{1}{2}850\times 25^2[/tex]

or

E₁ = 2.65 × 10⁵ J

Now, the potential energy gained by the car at the height 'h' will be

E₂ = mgh = 850 × 9.8 × 230 = 1.91 × 10⁶ J

Also, the energy required to make the car travel at the constant speed of 25.0 m/s with the force of 4 × 10² N for an hour will be

W = Force × displacement

now, the displacement will be = velocity × time = 25 m/s × 1hr = 25 × 3600 = 90000 m            [as 1 hr = 3600 seconds]

substituting in the above equation, we get

W = 4.0 × 10² N × 90000 m = 36 × 10⁶ J

Now, the electric potential energy (ΔU) is given as:

ΔU = qΔV

where, q is the charge

Now this electric potential energy is required to do all the work in the above cases

thus,

ΔU = E₁ + E₂ + W

or

qΔV = E₁ + E₂ + W

on substituting the values in the above equation, we get

q × 12 = 2.65 × 10⁵ J + 1.91 × 10⁶ J + 36 × 10⁶ J

or

q = (3.81 × 10⁷)/12

or

q = 3.175 × 10⁶ C

Hence, the required charge is 3.175 × 10⁶ C

Final answer:

Modifying a truck to increase its ground clearance involves installing larger tires or lift kits, which raise the suspension and increase the distance between the ground and the underside of the truck. These modifications can improve off-road capability and traction, but it's important to consider the impact on handling and stability.

Explanation:

When modifying a truck to increase its ground clearance, one approach is to install larger tires or lift kits. These modifications can raise the truck's suspension and increase the distance between the ground and the underside of the truck.

By raising the ground clearance, the truck will be able to navigate rough terrains more easily without damaging the undercarriage. It can also provide better off-road capability and allow for larger tires, which can improve traction.

However, it's important to note that modifying a vehicle's suspension can affect its handling and stability. It's recommended to consult with a professional or experienced mechanic to ensure that the modifications are done safely and will not negatively impact the truck's performance.

Answer:[tex]k=1.2\times 10^6 N/m^2,\theta =3.56^{\circ}[/tex]

Explanation:

Given

[tex]t=kx^2 Nm/m[/tex]

And a torque of 50 N.m is applied thus

[tex]T=\int_{0}^{0.05}kx^2dx[/tex]

[tex]50=\frac{1}{3}\left [ 5\times 10^{-2}\right ]^3[/tex]

[tex]k=1.2\times 10^6 N/m^2[/tex]

T at a distance x is given

[tex]T=\int_{0}^{x}1.2\times 10^6x^2dx[/tex]

[tex]T=0.4\times 10^6.x^3[/tex]

For Angle of twist

[tex]\theta =\frac{TL}{GJ}[/tex]

[tex]J=\frac{\pi d^4}{32}[/tex]

[tex]J=\frac{\pi \times 8^4\times 10^{-12}}{32}=0.402176[/tex]

G=75 GPa

[tex]\theta =\int_{0}^{0.05}\frac{\left ( 50-0.4\times 10^6x^3\right )}{GJ}[/tex]

[tex]\theta =3.56^{\circ}[/tex]

Final answer:

To find the constant k and the twist in the shank of the bolt, we equate the applied torque to the reactive torque equation, yielding k = 20,000 N.m/m^3. Then, using the shear modulus of A-36 steel, polar moment of inertia formula for circular cross-sections, and shear strain formula, we calculate the shear deformation.

Explanation:

To determine the constant k and the amount of twist in the shank AB, we first must understand that the torque T is the reactive torque on the shank due to its tightening, which is given by t = (kx2) N.m/m. Considering that the torque applied to the bolt head is T = 50 N.m, and the length of the shank x is 0.05 m (converting 50 mm to meters), we can set these values equal to find the constant k.

The shear deformation in the shank can be determined using the shear modulus (G), which is a material property indicative of the steel's rigidity. Given the shear modulus for A-36 steel is 75 GPa, and using the formula for shear strain γ = t/G, where t is the shear stress (related to torque T and the radius r), we can calculate the amount of twist in the shank.

First, we find k using T = kx2, which yields 50 N.m = k(0.05 m)2, solving for k gives us k = 20,000 N.m/m3.

Next, we calculate the shear stress t using the polar moment of inertia for a circular cross-section J = πr4/2, and shear strain using γ = tL/JG where L is the length of the shank. Substituting the given values including the radius r in meters gives us the shear deformation or twist in the shank.

Answer:

The real answers are: A, B, C, G

Explanation:

The wrong answers are: D and E

D: the magnetic force (Fm) is canceled if the Speed (V) is parallel to the direction of the magnetic field (B)

E: if there is no Speed (V) there is no Force (Fm).  F = q₀*v*B

q₀= electric charge

Final answer:

In a uniform magnetic field, the magnetic force acts on moving electric charges perpendicular to both their motion and the field itself, but not on stationary charges or those moving parallel to the field.

Explanation:

Considering a magnetic force acting on an electric charge in a uniform magnetic field, we find that the following statements are true:

a. The direction of the magnetic force acting on a moving electric charge in a magnetic field is perpendicular to the direction of motion.

b. The direction of the magnetic force acting on a moving charge in a magnetic field is perpendicular to the direction of the magnetic field.

c. A magnetic force is exerted on an electric charge moving through a uniform magnetic field.

g. An electric charge moving perpendicular to a magnetic field experiences a magnetic force.

Conversely, statements d and e are inaccuracies based on physics principles. An electric charge moving parallel to a magnetic field (statement d) does not experience a magnetic force because the force is dependent on the velocity of the charge being perpendicular to the field.

Similarly, a stationary electric charge in a uniform magnetic field (statement e) experiences no magnetic force, as the force acts only on moving charges.

Answer:

speed of plane in still air = 1060 km/h

speed of wind = 170 km/h

Explanation:

Let teh speed of plane in still air is vp and the speed of air is va.

Irt travels 2670 km in 3 hours against the wind

So,

vp - va = 2670 / 3 = 890 km/h ..... (1)

It travels 11070 km in 9 hours along the wind.

vp + va = 11070 / 9 = 1230 km/h .... (2)

Adding both the equations

2 vp = 2120

vp = 1060 km/h

and va = 1230 - vp = 1230 - 1060 = 170 km/h

Answer:

  (E) a greatly increased number of small particles in Earth’s orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible

Explanation:

The trade is one strong reflection for many weak reflections (and more dangerous near-Earth space travel).

None of the answer choices except the last one has anything to do with the effect of exploding a satellite. When you are arguing that exploding a satellite is ill conceived, you need to address specifically the effects of exploding the satellite.

Answer:15 KJ

Explanation:

We have given

at 1 atm

The heat of sublimation of Gallium =277 KJ/mol

heat of vaporization of Gallium =271 KJ/mol

[tex]\Delta H=277-271=6KJ/mol[/tex]

So heat required to melt 2.50 mol of gallium at 1 atm

Heat Required=[tex]2.5\times 6=15 KJ[/tex]

So heat required to melt 2.5 mol of gallium is 15 KJ

Final answer:

The heat required to melt 2.50 mol of gallium at 1 atm pressure is 692.5 kJ.

Explanation:

To find the heat required to melt 2.50 mol of gallium, we can use the heat of fusion (also known as the heat of sublimation) of gallium. The heat of fusion is the energy required to change a substance from a solid to a liquid at its melting point. In this case, we are given that the heat of sublimation of gallium is 277 kJ/mol.

Since gallium sublimes at 1 atm pressure, it bypasses the liquid phase and turns directly from a solid to a gas. Therefore, the heat required to melt 2.50 mol of gallium is the same as the heat of sublimation.

Therefore, to the correct number of significant figures, the heat required to melt 2.50 mol of gallium at 1 atm pressure is 2.50 mol x 277 kJ/mol = 692.5 kJ.

Answer:

A) may experience a magnetic foce, but its speed will not change

Explanation:

A charged particle moving in an uniform magnetic field experiences a force given by:

[tex]F=qvB sin \theta[/tex]

where

q is the charge of the particle

v is the velocity of the particle

B is the magnitude of the magnetic field

[tex]\theta[/tex] is the angle between the direction of v and B

From the formula we notice that:

- if the particle is moving parallel to the field, [tex]\theta=0[/tex], so force experienced by the particle is zero --> so we can exclude option D)

Moreover, the magnetic force experienced by the particle is perpendicular to the direction of motion. This means that:

- The direction of motion of the particle will change --> so we can exclude option B)

In addition, we can notice that since the magnetic force is perpendicular to the direction of motion of the particle, the work done by the force on the particle is zero: this means that the kinetic energy of the particle does not change, so the speed of the particle does not change. So we can exclude also option C, therefore the only correct option is

A) may experience a magnetic foce, but its speed will not change

Answer:

Part a)

[tex]t = 1.03 s[/tex]

Part b)

[tex]N = 10.3 rev[/tex]

Explanation:

Mass of the disc is given as

m = 2.00 kg

radius of the disc is given as

r = 7 cm

so moment of inertia of the disc is given as

[tex]I = \frac{1}{2}mr^2[/tex]

[tex]I = \frac{1}{2}(2)(0.07)^2[/tex]

[tex]I = 4.9 \times 10^{-3} kg m^2[/tex]

Now given that torque on the disc is

[tex]\tau = 0.600 Nm[/tex]

so here the angular acceleration is given as

[tex]\alpha = \frac{\tau}{I}[/tex]

[tex]\alpha = \frac{0.600}{4.9 \times 10^{-3}}[/tex]

[tex]\alpha = 122.45 rad/s^2[/tex]

Part a)

if disc start from rest and then achieve final speed as 1200 rpm then

[tex]f = 1200/60 = 20 rev/s[/tex]

so final speed is

[tex]\omega = 2\pi(20) = 40\pi rad/s[/tex]

now the time taken to reach this speed is given as

[tex]\alpha t = \omega[/tex]

[tex](122.45) t = 40\pi[/tex]

[tex]t = 1.03 s[/tex]

Part b)

Number of revolution in the same time is given as

[tex]N = \frac{\omega_o + \omega}{4\pi} t[/tex]

[tex]N = \frac{40\pi + 0}{4\pi}(1.03) = 10.3 rev[/tex]

Answer:

Explanation:

Let the volume of air be V. at atmospheric pressure, that is 10⁵  Pa

At 20 m below surface pressure will be

atmospheric pressure + hdg

10⁵ + 20 x 9.8 x 1000 = 2.96 x 10⁵Pa

At this pressure volume V becomes V/ 2.96  

This volume will last 1/2.96 times  time that is 60/2.96 = 20.27 minutes.

Newton's 2nd law: F = m a

Divide each side by m :. a = F/m

Plug in the 2 given numbers:

a = 744N / 205kg

Acceleration = 3.63 m/s^2 north

Using the formula for acceleration (Newton's second law), the sled's acceleration is calculated to be approximately 3.63 m/s² to the north.

The question is asking about acceleration, which in Physics is defined as the rate of change of velocity per unit of time. This is a concept in Newton's second law of motion which can be expressed with the formula F = ma. Here, F is the net force on the object, m is the mass of the object, and a is the acceleration of the object.

Therefore, we can solve the given problem by rearranging the formula to a = F/m.

In this scenario, the net force (F) is 744 N and the mass (m) is 205 kg. Substituting the values into the formula we have:

a = F/m = 744 N / 205 kg = approximately 3.63 m/s² (rounded to two decimal places).

Therefore, the sled's acceleration is approximately 3.63 m/s², directed to the north.

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Answer:

Boy has the greater linear velocity.

Explanation:

The liner velocity in a rotatory system is defined as:

v = ω×r

where,

v is the liner velocity

ω is the angular velocity

r is the radius.

The boy is near the edge and the girl is closer to the center. The scenario is shown in the image below.

As, mentioned in question, they are turning out at a constant rate, so the angular velocities of both the boy and the girl are same.

From the above inference, it can be concluded that now the linear velocity only depends on the radius of the disc. The linear velocity is directly proportional to the distance from the center.

Thus, the greater the distance from the center, the greater the value of liner velocity.

From the question also and from the image also the distance of the boy from the center is greater than the distance of the girl from the center. That's why boy has greater linear velocity.

Answer:

(a) 14.5 m /s

(b) 9.5 m /s

Explanation:

(a) velocity of boat with respect to water

V(b,w) = 12 i m/s

Velocity of water with respect to ground

V(w,g) = 2.5 i m/s

By the formula of relative velocity

Velocity of boat with respect to ground

V(b,g) = V(b,w) + V(w,g)

V(b,g) = 12 i = 2.5 i = 14.5 i m/s

Magnitude of velocity of boat with respect to ground = 14.5 m/s along + X axis.

(b)  velocity of boat with respect to water

V(b,w) = - 12 i m/s

Velocity of water with respect to ground

V(w,g) = 2.5 i m/s

By the formula of relative velocity

Velocity of boat with respect to ground

V(b,g) = V(b,w) + V(w,g)

V(b,g) = - 12 i = 2.5 i = - 9.5 i m/s

Magnitude of velocity of boat with respect to ground = 9.5 m/s along - X axis.

Answer:

Speed of one bus is [tex]114 \frac{km}{h}[/tex]  and speed of another bus is [tex] 98 \frac{km}{h}[/tex]

Explanation:

Let the speeds of two buses be [tex]v_1\, and\, v_2[/tex] respectively

Since speed of one bus is 16 km/h slower than the other

Therefore [tex]v_1= v_2+16\frac{km}{h}[/tex]

Since buses are traveling in opposite directions so relative speed of buses

[tex]v_{rel}=v_1+v_2= v_2+16\frac{km}{h}+v_2=2v_2+16\frac{km}{h}[/tex]

Distance traveled , [tex]d=v_{rel}t[/tex]

=>[tex]848=4(2v_2+16)[/tex]

=>[tex]v_2=98 \frac{km}{h}[/tex]

[tex]\therefore v_1=v_2+16\frac{km}{h}=(98+16) \frac{km}{h}=114 \frac{km}{h}[/tex]

=>[tex]v_1=114 \frac{km}{h}[/tex]

Thus speed of one bus is [tex]114 \frac{km}{h}[/tex]  and speed of another bus is [tex] 98 \frac{km}{h}[/tex]

Answer:

The partial pressure of gas A and B is option E) PA = 1.06 atm and PB = 0.53 atm

Explanation:

The pressure exerted by a particular gas in a mixture is known as its partial pressure. Then, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

PT = PA + PB

Dalton's partial pressure law can also be expressed in terms of the molar fraction of the gas in the mixture. The molar fraction is a dimensionless quantity that expresses the relationship of the number of moles of a component with the number of moles of all the components present.

The molar fraction of a gas A in a gas mixture is given by:

[tex]XA=\frac{nA}{nT}[/tex]

where nA is the amount of moles of gas A and nT is the amount of total moles.

This fraction will always be less than 1.

Then in a mixture of two or more gases, the partial pressure of the gas A can be expressed as:

PA = XA * PT

In this case you know that the total pressure PT is 1.6 atm.

You also know that 2.0 mol of gas A is mixed with 1.0 mol of gas B. Then the total number of moles will be 3 (2 moles of A plus 1 mole of B). Then you can calculate the mole fraction of gas A and gas B as:

[tex]XA=\frac{2 moles}{3 moles} =\frac{2}{3}[/tex]

[tex]XB=\frac{1 moles}{3 moles} =\frac{1}{3}[/tex]

Then, the partial pressure of the gas A and the partial pressure of the gas B can be expressed as:

[tex]PA=\frac{2}{3} *1.6 atm=1.06 atm[/tex]

[tex]PB=\frac{1}{3} *1.6 atm=0.53 atm[/tex]

Finally, the partial pressure of gas A and B is option E) PA = 1.06 atm and PB = 0.53 atm

Answer:

80 m/s

Explanation:

Rate of flow of blood, Volume per second = 4 x 10^-4 m^3/s

Area of blood vessel, A = 5 x 10^-6 m^2

So, Volume per second = area x velocity of blood

velocity of blood = (4 x 10^-4) / (5 x 10^-6) = 80 m/s

The speed of blood is 80 m/s.

Answer:

The maximum speed would double

Explanation:

The maximum speed of a mass-spring system is given by:

[tex]v=\omega A[/tex]

where

[tex]\omega[/tex] is the angular frequency

A is the amplitude of the motion

The angular frequency in a spring-mass system is

[tex]\omega=\sqrt{\frac{k}{m}}[/tex]

where

k is the spring constant

m is the mass

Substituting inside the first equation,

[tex]v=\sqrt{\frac{k}{m}} A[/tex]

In this problem:

- the spring constant is increased by a factor 4: k' = 4 k

- the amplitude remains constant: A' = A

So the new maximum speed would be

[tex]v'=\sqrt{\frac{4k}{m}} A= \sqrt{4} (\sqrt{\frac{k}{m}}A)= 2v[/tex]

So, the maximum speed would double.

The maximum speed of the block in simple harmonic motion is not affected by changes in the spring constant when the amplitude of oscillation is held constant.

The maximum speed of the block in simple harmonic motion is not affected by changes in the spring constant when the amplitude of oscillation is held constant.

The maximum speed of the block is determined by the amplitude of oscillation. As long as the amplitude remains the same, increasing the spring constant by a factor of 4 will not change the maximum speed.

Therefore, the maximum speed of the block would not be affected if the spring constant was increased by a factor of 4 while holding the amplitude of oscillation constant.

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We have that Metals are elements that mostly produce ions of Positive charges eg [tex]Na^{2+}[/tex]

While Non metals tends to have negatively charged ions as like [tex]O^-[/tex]

We have that The electro negativity of nonmetals is relatively  High as compared to the electro negativity of metals which is Low

From the question we are told

The electro negativity of nonmetals is relatively __________ as compared to the electro negativity of metals.

Generally

Metals are elements that mostly produce ions of Positive charges eg [tex]Na^{2+}[/tex]

While Non metals tends to have negatively charged ions as like [tex]O^-[/tex]

Therefore

From the definition above

Metals are elements that mostly produce ions of Positive charges eg [tex]Na^{2+}[/tex]

While Non metals tends to have negatively charged ions as like [tex]O^-[/tex]

We have that The electro negativity of nonmetals is relatively  High as compared to the electro negativity of metals which is Low

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Answer:

E. two times the original diameter

Explanation:

Resistance of a wire is:

R = ρ L/A

where ρ is the resistivity of the material, L is the length, and A is the cross-sectional area.

For a round wire with diameter d:

R = ρ L / (¼ π d²)

The two wires must have the same resistance, so:

ρ₁ L₁ / (¼ π d₁²) = ρ₂ L₂ / (¼ π d₂²)

The wires are made of the same material, so ρ₁ = ρ₂:

L₁ / (¼ π d₁²) = L₂ / (¼ π d₂²)

The new length is four times the old, so 4 L₁ = L₂:

L₁ / (¼ π d₁²) = 4 L₁ / (¼ π d₂²)

1 / (¼ π d₁²) = 4 / (¼ π d₂²)

Solving:

1 / (d₁²) = 4 / (d₂²)

(d₂²) / (d₁²) = 4

(d₂ / d₁)² = 4

d₂ / d₁ = 2

So the new wire must have a diameter twice as large as the old wire.

Answer: easy transportation

Explanation:

Natural gas, after being extracted from the ground, can be sent from one place to another, wether by long gas pipelines or by large methane vessels after having gone through the liquefaction process (pass it to the liquid state).

It should be noted that in the case of transport by these vessels, it has the advantage of the possibility of ramifying the distribution without being limited to the location of the gas pipelines.

The bucket that holds more water is the bucket that is 65.9 cm from the balance point.

The bucket that exerts the greatest force will be determined by applying the pinciple of moment as shown below;

 |___________1.43 m_________________|

 ---------------------------------------------------------------

↓           Δ  5.59 cm    |                                     ↓

W1                                 W                                   W2

Take moment about the pivot;

W1(0.715 - 0.0559)  =  W(0.0559) + W2(0.715 + 0.0559)

W1(0.659) = W(0.0559) + W2(0.771)

Since the weight of the first bucket balances the weight of the rod and theb second bucket, the weight of the first bucket is the greatest.

Thus, the bucket that holds more water is the bucket that is 65.9 cm from the balance point.

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The bucket that holds more water is on the side of the rod that is closer to the balance point. This is because the weight of the water is causing a greater torque on that side, pulling the balance point towards it.

This problem relates to the principle of torque and balance. The total torque on an object is the sum of each individual torque, and when a system is in equilibrium, the total torque is zero. The torque caused by a force is calculated by multiplying the force by the distance it is from the pivot.

In this scenario, the man is balancing a long rod with two non-identical water-filled buckets. The rod is balancing off-center, indicating that the system is unbalanced and more weight is on one side. The bucket that holds more water is on the side of the rod that is closer to the balance point because more weight is pulling down on that side.

Given that the balance point is 5.59 cm from the midpoint of the 1.43m rod, the side that has the balance point nearer to the mid-point is experiencing a higher force - meaning it contains the bucket with more water.

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Answer:

(B) 0.06W

Explanation:

power absorbed by the resistor is given by [tex]\frac{V^2}{R}=I^2R[/tex]

Where V = voltage

           R= resistance

            I =  current through the circuit

we have given V =12 Volt and resistance =2.4 K[tex]\Omega[/tex]

current [tex]I=\frac{V}{R}=\frac{12}{2.4\times 1000}=5\times 10^{-3}A=5mA[/tex]

power using voltage and resistance equation

[tex]p=\frac{12^2}{2.4\times 1000}=60mW[/tex] =0.06W

using current equation [tex]P=I^2R=5^2\times 12=60mW[/tex]= 0.06W

Answer:

person A

Explanation:

because the sound is moving twords them

In the context of the Doppler Effect, person A will hear the highest pitch if they are located to the west of the moving sound source. The correct answer is a.

As the source of the sound moves west, the observer who would hear the highest pitch is the one located to the west of the source, i.e., in the direction of the source's movement.

Since the source is moving towards the west, according to the Doppler Effect, the sound waves are compressed, and the wavelength is reduced in the direction of motion (west). This results in a higher frequency, which corresponds to a higher pitch, being heard by the observer in that direction.

If person A is to the west of the source, then person A will hear the highest pitch. It's important to note that person B has been indicated as not correct, hence, if person A is in the correct position relative to the westward movement of the source, person A will experience the higher pitch sound as compared to the others positioned differently.

Answer:

Time taken from transmission = 719.61 seconds or  11.99 minutes

Explanation:

Given data:

The distance between the mars and the earth = 1.34 × 10⁸ miles

Now, converting the distance into meters

1 mile = 1.61 km = 1610 m

thus, we have

1.34 × 10⁸ miles = 1610 × 1.34 × 10⁸ m = 2.1574 × 10¹¹ m

Now, the picture will travel with the speed of light i.e 2.998 × 10⁸ m/s

also,

Time = Distance/speed

thus we have,

Time taken from transmission = (2.1574 × 10¹¹ m)/(2.998 × 10⁸ m/s)

or

Time taken from transmission = 719.61 seconds or (719.61/60 = 11.99 minutes)

The time it takes for TV pictures transmitted from the Viking space vehicle on Mars's surface to reach Earth is approximately 7.17 × 10^2 seconds.

To calculate the time it takes for TV pictures transmitted from the Viking space vehicle on Mars's surface to reach Earth, we need to convert the distance between Mars and Earth from miles to meters. The approximate distance between Mars and Earth is 1.34 × 108 miles, which is approximately 2.15 × 1011 meters. The speed of light is approximately 3 × 108 meters per second. Dividing the distance by the speed of light, we can calculate the time it takes: 2.15 × 1011 meters / (3 × 108 meters per second) = 7.17 × 102 seconds.

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Answer:

C. Potential energy

Explanation:

At this point the roller coaster is just waiting to be dropped into moving energy, kinetic energy. But at the moment that its at the top, its just potential energy.

At the highest point of the hill, the coaster has potential energy, therefore the correct option is C.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.

As total mechanical energy is the sum of all the kinetic as well as potential energy stored in the system.

As the coaster is stopped at the highest point it has zero kinetic energy the only form of energy it contains is potential energy.

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Answer:

Option (d)

Explanation:

The electrons in a conductor moves with the drift velocity when the electric current is flowing through the conductor.

The drift velocity is due to the applied electric field across the conductor.

Answer:

Force = 6.25 N

Explanation:

Given:

Distance between the rails, l = 50cm = 0.5m

since it is forming a square area. thus, area = 0.5² m²

Resistance of the bar = 0.05Ω

Magnetic field, B = 0.5T

Time = 0.1s

Now,

The value for EMF is given as

EMF = (ΔArea x Field) /time

substituting the values in the above equation we get

EMF = (0.5² x 0.5) /0.1 = 1.25 Volts

now,

Current, i = EMF/ Resistance

substituting the values in the above equation we get

i = 1.25/0.05 = 25 A

Now the force is given as:

Force = i x l x B

Force = 25 x 0.5 x 0.5

Force = 6.25 N

Answer:

B. Any object that moves through air or space solely under the influence of gravity.  

Explanation:

Once it is dropped it continues in motion by it's own inertia and is influenced only by the downward force of gravity.

Final answer:

The correct definition of a projectile is any object that moves through air or space solely under the influence of gravity. Projectile motion involves an object launched into the air, only affected by gravity, with its horizontal and vertical motions being independent. A projectile's path is termed its trajectory, with its peak called the maximum height, and the distance covered called the range.

Explanation:

A projectile is best defined as (B) any object that moves through air or space solely under the influence of gravity. This definition eliminates any objects that are powered by engines or propellers after launch, such as rockets, and instead includes objects like balls thrown in sports, bullets fired from a gun, or rocks thrown into the air.

Once a projectile is in motion, it is subject to what is known as projectile motion. To clarify, projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. The initial force that causes the projectile to move is disregarded after launch, and the only force acting on the projectile is the force of gravity pulling it downwards.

Properties of projectile motion are important when studying the physics behind these objects. When a projectile is in flight, its horizontal and vertical motions are independent of one another. This means that the projectile's horizontal velocity remains constant (ignoring air resistance), while the vertical velocity changes due to the acceleration of gravity. The trajectory of a projectile is its path through the air, and is typically a curved shape due to the influence of gravity. The maximum height reached by the projectile is the highest point in its trajectory, and the range is the maximum horizontal distance it covers.