A long uniform thin rod of length 55 cm and mass 1.2 kg in FIGURE 2 rotates in
the plane of the figure about an axis through one end of the rod. As the rod
swings through its lowest position, it collides with a 200 g putty wad that sticks to the end of the thin rod. Given the rod's angular speed just before the collision is 3 rad/s. Calculate

(i) the moment of inertia of the long thin rod.
(ii) the initial angular momentum of the system before the collision.
(iii) the angular speed of the rod-putty wad system immediately after collision.​

Ek = 6KJ.

In physics, the kinetic energy of a body or object is the one that owns due to its movement and is given by the equation [tex]E_{k} = \frac{1}{2} mv^{2}[/tex], where m is the mass of the object in kilograms and v is the velocity in m/s.

An object that it has a mass of 30 kilograms and moves with a velocity of 20m/s, its kinetic energy is given by:

[tex]E_{k} = \frac{1}{2} (30kg)(20m/s)^{2}=6000J=6KJ[/tex]

Answer:

A. 19.6 m/s

B. 44.6 m

C. 5.0 s

D. -19.6 m/s

Explanation:

At the highest point, the stone's velocity is 0.

A. Given:

v = 0 m/s

t = 2 s

a = -9.8 m/s²

Find: v₀

v = at + v₀

0 = (-9.8)(2) + v₀

v₀ = 19.6 m/s

B. Given:

y₀ = 25 m

t = 2 s

v₀ = 19.6 m/s

a = -9.8 m/s²

Find: y

y = y₀ + v₀ t + ½ at²

y = 25 + (19.6)(2) + ½(-9.8)(2)²

y = 44.6 m

C. Given:

y₀ = 25 m

y = 0 m

v₀ = 19.6 m/s

a = -9.8 m/s²

Find: t

y = y₀ + v₀ t + ½ at²

0 = 25 + (19.6)t + ½(-9.8)t²

0 = 4.9t² − 19.6t − 25

t ≈ 5.0 s

D. Given:

v₀ = 19.6 m/s

a = -9.8 m/s²

t = 4 s

Find: v

v = at + v₀

v = (-9.8)(4) + 19.6

v = -19.6 m/s

The velocity is -19.6 m/s.  If you want the speed, or magnitude of the velocity, take the absolute value: 19.6 m/s.

Explanation:

B.

The final thermal energy of the system is the sum of the original internal energy of the system and the change in energy of the system (ΔE). When the piston does work (W), all the thermal energy is transferred to kinetic energy.

The law of conservation of energy states that the total energy of a closed system remains constant over time. This includes both mechanical and thermal energies, where mechanical energy is the sum of kinetic and potential energy, and is conserved in the absence of external forces. The first law of thermodynamics encompasses this principle through the statement that the change in internal energy of a system is equal to the heat added to the system plus the work done on it. So the correct option is A.

The law of conservation of energy in a closed physical system indicates that the total energy within the system remains constant over time. This concept is articulated in the question which concerns how mechanical and thermal energies are conserved within such a system. To clarify, none of the answer choices directly match the principles of energy conservation as generally understood in physics. However, using the information provided, we can explore the principles relevant to the question.

In a closed system, mechanical energy, which includes both kinetic and potential energy, is conserved unless acted upon by external forces. If a piston does work (W), it may convert some of the system's internal energy to kinetic energy, but the total mechanical energy of the system will not change. This aligns with the principle that during any process, the change in a system's mechanical energy will be equal to the work done on the system minus any heat transfer (Q).

According to the first law of thermodynamics, the change in internal energy of a system (ΔE) is equal to the heat added to the system (Q) plus the work done on the system (W). This statement encompasses the conservation of thermal energy as part of the system's total energy. The energy may shift between mechanical and thermal forms, but the total remains the same.

Therefore, the interpretation of the law of conservation of energy should reflect these ideas, and none of the answer choices provided perfectly do so. The closest is perhaps option A, which mentions the transfer of mechanical energy and the work done by the piston, but the phrasing about energy differences is not accurate.

Answer:when a wave moves from a dense medium to a less dense medium most of the wave energyis refracyed.

Explanation:

Answer: reflected

Explanation: A P E X

Answer:

2 seconds

Explanation:

v = at + v₀

19.62 m/s = (9.81 m/s²) t + 0 m/s

t = 2 s

Answer:

the answer is to safeguard Americans rights took the test

Explanation:

C. To safeguard American's rights

The bill of Rights is the name given to the primary 10 amendments to our constitution. The bill of Rights consists of guarantees of civil liberties and checks on state power; it was introduced in order to convince states to ratify the constitution.

the 3 most important Bill of Rights

The Bill of Rights lists essential rights to be protected

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Answer:

false

Explanation:

because

scalar quantity :has only magnitude but no direction

vector quantity : has both magnitude and direction

Answer:

The forth one

Explanation:

8N of net force is applied to the golf ball

Answer:

2500

Explanation:

1 Angstrom (1 A) corresponds to

[tex]1 A = 10^{-10} m[/tex]

Therefore we can convert the wavelength of the light from Angstroms to meters:

[tex]\lambda = 4000 A = 4000 \cdot 10^{-10} m = 4\cdot 10^{-7} m[/tex]

We also know that

[tex]1 mm = 1\cdot 10^{-3} m[/tex]

So the number of waves in 1 mm of distance is:

[tex]n=\frac{1\cdot 10^{-3} m}{4\cdot 10^{-7} m}=2500[/tex]

Answer: -194 mph

Explanation:

Taking into account the Sun as the center (origin, point zero) of the reference system, the velocity of the spacecraft relative to the Sun [tex]V_{R-S}[/tex] is:

[tex]V_{R-S}=126mph[/tex]  Note it is positive because the spacecraft is moving away from the Sun

Taking into account the spacecraft as the center of another reference system, the velocity of the asteroid relative to the spacecraft [tex]V_{A-R}[/tex] is:

[tex]V_{A-R}=-68mph[/tex] Note it is negative because the asteroid is moving towards the spacracft.

Now, the velocity of the asteroid relative to the Sun [tex]V_{A-S}[/tex] is:

[tex]V_{A-S}=V_{A-R}-V_{R-S}[/tex]

[tex]V_{A-S}=-68mph-126mph[/tex]

Finally:

[tex]V_{A-S}=-194mph[/tex] This is the velocity of the asteroid relative to the Sun and its negative sign indicates it is moving towards the Sun.

The asteroid's velocity relative to the spacecraft (68 mph) from the spacecraft's velocity relative to the sun (126 mph), resulting in 58 mph.

The question involves calculating the velocity of the asteroid relative to the sun, given its velocity relative to a spacecraft and the spacecraft's velocity relative to the sun. To do this, we need to add the velocities, taking into account the direction each one is moving.

Since the asteroid is moving in the opposite direction to the spacecraft relative to it, we subtract the asteroid's velocity from the spacecraft's velocity. The spacecraft's velocity relative to the sun is 126 mph. Therefore, we subtract the asteroid's relative velocity of 68 mph from this to find the asteroid's velocity relative to the sun.

The asteroid's velocity relative to the sun = spacecraft's velocity relative to the sun - asteroid's velocity relative to the spacecraft = 126 mph - 68 mph = 58 mph.

Thus, the asteroid is moving at 58 mph relative to the sun.

Answer:

Earth's spin on its axis causes the equator to bulge

Explanation:

The Earth is not a perfect sphere but an oblate ellipsoid. The force that holds a planet is gravity. The Earth is rotating on its axis at a speed of 460 m/s at the equator. Due to this reason there is a build up of centrifugal force on the Earth which causes it to expand giving it a bulge.

The Sun and the Moon's gravity causes waves on the surface of large water bodies.

Answer:

Constructive

Explanation:

Superposition of two wave crests produces constructive interference.

Answer:

Superposition of two wave crests produces destructive interference.

Explanation:

You may have already let your phone ring near the speakers of a computer and noticed that they started to sizzle. You must also have heard that, when traveling by plane, the cell phone must be turned off to avoid failures in the communication devices. Both cases have the same reason: wave interference. Waves are energetic pulses that propagate through space periodically. When two waves overlap in the same region of space, interference occurs, which results in another wave with different intensity. These inferences can be either constructive or destructive.

The superposition of two wave crests produces destructive interference. This type of inference occurs when two waves that meet have different phases, so that one annihilates the other. The result is a wave with zero amplitude.

Answer:7.92 gallons

Explanation:

Answer:

D. move independently.

Explanation:

To be considered a living thing, an organism must be able to move independently.

Answer:

To be considered a living thing, an organism must be able adapt to change.

A person riding a bicycle past a tree while wearing a helmet is moving relative to the tree, the bicycle, and the helmet. This is a concept in physics known as frames of reference, implying movement and direction are dependent on the perspective of observation.

When a person rides a bicycle past a tree while wearing a helmet, the person is moving relative to the tree, the bicycle, and the helmet. That is to say, if you were observing from the cyclist's perspective, everything would be moving: the tree as they pass, the bicycle beneath them, and even their helmet.

This is typical of what we discuss in physics as frames of reference, with the notion of relative movement. While the tree appears to move in one direction, the bicycle and helmet in another, everything depends on your perspective or your frame of reference.

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Answer:

A. [tex]0.5 m/s^2[/tex]

Explanation:

The average acceleration is equal to the ratio between the change in velocity and the time elapsed:

[tex]a=\frac{\Delta v}{\Delta t}[/tex]

The change in velocity between t=0 s and t=10 s is the change on the vertical axis:

[tex]\Delta v = 5 -0 = 5 m/s[/tex]

Whule the time interval is

[tex]\Delta t = 10 s[/tex]

So the average acceleration is

[tex]a=\frac{5 m/s}{10 s}=0.5 m/s^2[/tex]

Answer:

A

Explanation:

plato

Answer:

wrist watch

Explanation:

The energy stored in a spring of a watch is potential energy which is as a result of winding of the string. This energy is used to run the watch as it converts this potential energy to rotational kinetic energy.

"Wrist watch" stores the least electrical potential energy within their capacitors. A further explanation is below.

Thus the response above is appropriate.

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For a wave:

v = fλ

v is the velocity, f is the frequency, and λ is the wavelength.

Assuming the velocity of the wave doesn't change...

If you increase its frequency, its wavelength will shorten.

Answer:

As the frequency of a wave increases, the shorter its wavelength is.

Explanation:

Answer:

(C) 2P

Explanation:

Ideal gas law states:

PV = nRT

n (the number of moles) and R (ideal gas constant) are constant, so we can say:

(PV / T) before = (PV / T) after

Chamber X starts at pressure P, volume V, and temperature T.  At equilibrium, the pressure is Px, the volume is Vx, and temperature 3T.

PV / T = Px Vx / 3T

Chamber Y starts at pressure P, volume V, and temperature T.  At equilibrium, the pressure is Py, the volume is Vy, and temperature T.

PV / T = Py Vy / T

Substituting and simplifying:

Px Vx / 3T = Py Vy / T

Px Vx / 3 = Py Vy

Since the chambers are at equilibrium, Px = Py:

Vx / 3 = Vy

Vx = 3 Vy

The total volume is the same as before, so:

Vx + Vy = 2V

Substituting:

(3 Vy) + Vy = 2V

4 Vy = 2V

Vy = V / 2

Now if we substitute into our equation for chamber Y:

PV / T = Py (V/2) / T

PV = Py (V/2)

Py = 2P

The pressure in chamber Y (and chamber X) doubles at equilibrium.

The gas pressure of chamber Y at the equilibrium after the

heating is 2P.

This is defined as the equation of state of a hypothetical ideal gas and it is depicted by the following below:

PV = nRT

We can infer that the number of moles(n) and R (ideal gas constant) are constant

PV / T (Initial) = PV / T (Final)

We were told that Chamber X starts at pressure P, volume V, and temperature T.  At equilibrium, the pressure is Px, the volume is Vx, and temperature 3T.

PV / T = P V / 3T

We were also told that Chamber Y starts at pressure P, volume V, and temperature T.  At equilibrium, the pressure is Py, the volume is Vy, and temperature T.

PV / T = Py Vy / T

Substitute into the equation:

Px Vx / 3T = Py Vy / T

Px Vx / 3 = Py Vy

At equilibrium, the chambers are : Px = Py:

Vx / 3 = Vy

Vx = 3 Vy

The total volume is the same as before, so:

Vx + Vy = 2V

Substitute into the equation

(3 Vy) + Vy = 2V

4 Vy = 2V

Vy = V / 2

Substitute into our equation for chamber Y:

PV / T = Py (V/2) / T

PV = Py (V/2)

Py = 2P

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Final answer:

The correct answer is D. 0 m/s. This is because the ball has no initial vertical velocity when launched horizontally from a cliff.

Explanation:

The initial vertical velocity for a ball launched horizontally from a cliff would be 0 m/s. This is because when an object is thrown horizontally, it means that all of its initial velocity is in the horizontal direction, and thus it has no initial vertical velocity.

Looking at our options:

No.

Uniform motion means no acceleration ... speed and direction are not changing.

Uniform motion involves moving at a constant velocity, while non-uniform motion entails changes in speed or direction. Uniformly accelerated motion changes velocity over time and is not uniform. Uniform circular motion has a constant speed but changes direction, while non-uniform circular motion changes in speed and possibly acceleration.

Uniform motion occurs when an object moves at a constant velocity, meaning that it covers equal distances in equal intervals of time regardless of the length of the interval. On the other hand, non-uniform motion involves changes in the speed or direction of the object, meaning the object does not cover equal distances in equal time intervals, which can include speeding up, slowing down, or changing direction.

Uniformly accelerated motion is not considered uniform motion because, even though the acceleration is constant, the velocity of the object changes over time. Specifically, in uniformly accelerated motion, the object’s speed increases or decreases at a steady rate, leading to a change in velocity.

Uniform circular motion refers to an object moving along a circular path with a constant speed, which means that the object’s velocity is constant in magnitude, but changing in direction. This is a special type of uniform motion because it involves constant speed but the direction is continually changing, which implies the presence of acceleration. Conversely, non-uniform circular motion refers to when an object is traveling along a circular path but with a changing speed, which can also mean changing acceleration.

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Initially, the velocity vector is [tex]\langle 38cos(40^{\circ}),38sin(40^{\circ}) \rangle=\langle 29.110, 24.426 \rangle[/tex]. At the same height, the x-value of the vector will be the same, and the y-value will be opposite (assuming no air resistance). Assuming perfect reflection off the ground, the velocity vector is the same. After 0.2 seconds at 9.8 seconds, the y-value has decreased by [tex]4.9(0.2)^2[/tex], so the velocity is [tex]\langle 29.110, 24.426-0.196 \rangle = \langle 29.110, 24.23 \rangle[/tex].

Converting back to direction and magnitude, we get [tex]\langle r,\theta \rangle=\langle \sqrt{29.11^2+24.23^2},tan^{-1}(\frac{29.11}{24.23}) \rangle = \langle 37.87,50.2^{\circ}\rangle[/tex]

Answer:

86.6Nm(j)

Explanation:

we know,

w=Fd

w=17.32*5

w=86.6Nm.

as we know the distance but we doesnot know the exact force .becauseit acts at an angle.This mean the orginal force of 20N is essentially split up in 2 direction in along axis of displacement ,and perpendincular direction that occur at 30degree angle.

the resultant displacement of object is along a line inclined by 30 degrees of that orginal plane ,then the force acting in the direction of that displacement equal to 20*cos30.I.e,17.32 .

wavelength frequency and other

Explanation:

Waves travel through a medium: A medium is any substance or region through which a wave is transmitted. The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature. Wave speed is calculated by multiplying the wavelength times the frequency (speed = l * f).

Final answer:

The speed of a wave depends primarily on the medium's characteristics, such as elasticity, inertia, pressure, density, and temperature for sound waves, and tension and linear mass density for waves on a string.

Explanation:

The speed of a wave is influenced by the properties of the medium through which it propagates. Factors such as the elasticity of the medium and the inertia of its particles, which are measures of the medium's ability to return to equilibrium and the mass of the particles, respectively, play significant roles in determining wave speed. The speed is not dependent on the wave's amplitude or the energy of the generating mechanism but on the medium's physical properties. For example, the speed of sound waves is affected by the density, pressure, and temperature of air, while the speed of a wave on a string is proportional to the square root of the tension in the string and inversely proportional to the square root of the linear mass density. The wave speed can therefore be experimentally determined using its relationship with the medium's properties.

Answer:

E

Explanation:

As temperatures go up solids become more towards the next state of matter, liquid which is very soluable (like mixing drinks). while as it gets colder, solids become more solid, the atoms come closer together which forms stronger bonds between them so they don't want to mix as well. Solids, for the most part can only become more solid as it gets colder, unless you count bohrs-einstein conisates

Answer:

Hi there!

The answer is: A. True

Explanation:

Heat = mass × specific heat × temperature change

q = m C ΔT

Given:

q = 337500 J

m = 50 kg

ΔT = 15°C

Substitute:

337500 J = (50 kg) C (15°C)

C = 450 J/kg/°C

Specific heat is usually recorded in J/g/°C or kJ/kg/°C.  Converting:

C = 0.45 J/g/°C = 0.45 kJ/kg/°C

Final answer:

The specific heat of the object is calculated using the formula Q = mcΔT. Upon substituting the values provided into the formula and rearranging it to solve for specific heat (c), we determine that the specific heat of the object is 450 J/kg°C.

Explanation:

To calculate the specific heat of the object, we use the formula:

Q = mcΔT

Where:

Q is the amount of heat added, in joules

m is the mass of the object, in kilograms

c is the specific heat capacity, in J/kg°C

ΔT is the change in temperature, in degrees Celsius (or Kelvin, since the change is the same in both scales)

We are given the following values:

Q = 337,500 J

m = 50 kg

ΔT = 15°C

We rearrange the formula to solve for c:

c = Q / (mΔT)

Plugging in the values:

c = 337,500 J / (50 kg × 15°C)

c = 337,500 J / 750 kg°C

c = 450 J/kg°C

Therefore, the specific heat of the object is 450 J/kg°C.

Answer:

Electrons jump between energy levels, absorbing and releasing energy as they are jumping between energy levels. The energy given off corresponds to different frequencies of light. If the light is visible, we see these frequencies as different colors.  

Electrons play a crucial role in producing light. When an electron gains energy, it moves to a higher energy level and quickly returns to its original level, releasing the excess energy as a photon. The energy of the photon determines its color or wavelength, allowing scientists to manipulate light color and intensity by controlling electron energy levels.

Electrons play a crucial role in producing light. When an electron in an atom gains energy, it moves to a higher energy level or orbital. However, this excited state is unstable, so the electron quickly returns to its original energy level, releasing the excess energy in the form of a photon, which is a particle of light.

The energy of the photon determines its color or wavelength. For example, blue light has a higher energy than red light. By controlling the energy levels of electrons in objects such as light bulbs or LEDs, scientists and engineers can manipulate the color and intensity of light produced.

This phenomenon is seen in fluorescent lights, where electricity is used to excite electrons in a gas, causing them to release photons. These photons then strike a material called a phosphor, which emits visible light. So, without electrons and their ability to gain and release energy, we wouldn't have light as we know it.

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