Two electronics technicians are discussing conductors and insulators. Technician A says that conductors have more free electrons than insulators. Technician B says that insulators have lower resistance than conductors. Which of the following statements is correct? 

The book's vertical position in the air is

[tex]y=78.4\,\mathrm m-\dfrac12gt^2[/tex]

where [tex]g=9.80\,\frac{\mathrm m}{\mathrm s}[/tex]. It reaches the ground when [tex]y=0[/tex], at a time [tex]t[/tex] such that

[tex]0=78.4\,\mathrm m-\dfrac12gt^2\implies t=4.00\,\mathrm s[/tex]

So it takes the book 4 seconds to reach the bottom. The given initial velocity is irrelevant since it only has a horizontal component; vertically, the book is starting from rest.

Speed of car A is given as

[tex]v_a = 70 mph[/tex]

now we need to convert it into SI units

1 miles = 1609 m

1 hour = 3600 s

now we have

[tex]v_a = 70 *\frac{1609}{3600} = 31.3 m/s[/tex]

now its distance from Bambi is given as

[tex]d_a = 350 m[/tex]

time taken by it to hit the Bambi

[tex]t = \frac{d}{v}[/tex]

[tex]t = \frac{350}{31.3}[/tex]

[tex]t = 11.2 s[/tex]

Now other car is moving at speed 50 mph

so its speed in SI unit will be

[tex]v_b = 50* \frac{1609}{3600}[/tex]

[tex]v_b = 22.35 m/s[/tex]

now its distance from Bambi is given as

[tex]d_b = 590 feet[/tex]

as we know that 1 feet = 0.3048 m

[tex]d_b = 590*0.3048 = 179.83 m[/tex]

now the time to hit the other car is

[tex]t_2 = \frac{179.83}{22.35}[/tex]

[tex]t_b = 8.05 s[/tex]

So Car B will hit the Bambi first

Answer:

Car b

Explanation:

Element is is a substance that cannot be broken down into a simpler substance

Atom is the basic unit of an element

Particle a tiny piece of matter

A phase is  a unique form of matter in which it can exist

Anything which has mass and occupies spaces is known as matter, mainly there are four states of matter solid liquid gases, and plasma.

These different states of matter have different characteristics according to which they vary their volume and shape.

Unable to be reduced to a simpler substance, an element is a substance.

An element's fundamental unit is the atom, and a particle is a small piece of matter.

An exclusive state of matter is referred to as a phase.

Thus, an Element is a substance that cannot be broken down into a simpler substance, Atom is the basic unit of an element, a Particle a tiny piece of matter, and a phase is  a unique form of matter in which it can exist

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B. Friction can be a centripetal force, such as when it keeps a car on the road going around a curve.

C. Gravity can be a centripetal force, such as when it pulls a satellite in its orbit.

Explanation:

The centripetal force is any force that keeps an object moving in circular motion, "pulling" the object towards the centre of the circular trajectory.

Several forces can act as centripetal force. Examples are:

- friction: when a car is going around the curve, is moving by circular motion. The force that keeps the car in circular motion is, in fact, the friction between the tires and the road.

- Gravity: when a satellite moves around the Earth, it is moving by circular motion. The force that keeps the satellite in circular motion is the gravitational attraction between the Earth and the satellite, that pushes the satellite towards the Earth.

The other two options are not correct because:

A) An object can also accelerate if there is no centripetal force (for example, a car speeding up on a straight road is accelerating, but there is no centripetal force since there is no circular motion

D) Centripetal force is not an outward force, since it pushes the object inwards (towards the centre of the trajectory).

The density of a substance is the ratio of its mass to its volume. So whatever volume you have (call it [tex]V[/tex]), the density [tex]\rho[/tex] is computed by

[tex]\rho=\dfrac{200\,\mathrm g}V[/tex]

The density of the macaroni cannot be calculated without knowing the volume. If volume is available, density can be computed by dividing mass by volume.

In the realm of Physics, density is determined by the ratio of mass to volume, typically in units of grams per cubic centimeter (g/cm³). To find the density of an object, you simply divide the mass by the volume. However, in the context of your question, we are not provided with the volume calculated in question 7a.

Without the volume, the calculation of density can't be completed. If we have the volume, the formula to calculate the density would be Density = Mass / Volume. So for example, if the macaroni's volume was 50cm³, then the density would be 200g / 50cm³ = 4g/cm³.

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newtons law states gravity holds things down there fore wigheing you down

Answer:

The greater force will be required to overcome weight.

Explanation:

According to Newton’s second law of motion:

F = W = mg         ………. (i)

Equation (i) shows that with the increase in mass the force or weight in the downward direction will increase. When climber packs too much gear then he has to apply more force in the upward direction to overcome his on weight and luggage. Therefore, it will be difficult for him to reach the summit before a storm blows in. In this way, this scenario is related with Newton’s law.

Given that 0.8 MJ of energy is used in 3.5 minute of time

Now we need to find the power rating

so here power consumed is given by rate of energy which is defined by formula

[tex]Power = \frac{Energy}{time}[/tex]

now we will plug in all given data

[tex]Energy = 0.8 MJ = 8 * 10^5 J[/tex]

[tex]time = 3.5 min = 3.5 * 60 = 210 s[/tex]

now we will find the power

[tex]P = \frac{8 * 10^5}{210}[/tex]

[tex]P = 3809.5 Watt[/tex]

[tex]P = 3.81 kW[/tex]

so it will consume total 3.81 kW power

Final answer:

The power of a blender that uses 0.8MJ in 3.5 minutes is approximately 3.81kW. To find the power rating of an oven, however, additional information would be required.

Explanation:

To calculate the power rating of an oven that uses 0.8 megajoules (MJ) of energy in 3.5 minutes, we would first convert the energy to joules (J), since 1 MJ = 1,000,000 J. Therefore, the energy used is 0.8 MJ * 1,000,000 J/MJ = 800,000 J. After that, we need to convert the time to seconds for consistency since power is typically measured in watts (J/s). There are 60 seconds in a minute, so 3.5 minutes * 60 seconds/minute = 210 seconds.

Now we can calculate the power using the formula: Power (P) = Energy (E) / Time (t). Plugging in our values gives us P = 800,000 J / 210 s = 3,809.52 watts or approximately 3.81 kilowatts (kW). However, since we are looking for the power rating of the oven and not the blender.

your answer is c) Ends

As can be visualized with the magnetic field lines, the magnetic field is strongest inside the magnetic material. The strongest external magnetic fields are near the poles. A magnetic north pole will attract the south pole of another magnet, and repel a north pole.

Answer: The correct answer is "Ends".

Explanation:

Bar magnet is a permanent magnet.

Bar Magnet has two poles: North pole and South pole.

Same poles repel each other and the opposite poles attract each other.

The magnetic field lines originates from the north pole and ends at the south pole.

The magnetic filed lines are surrounding of the magnet in which the magnetic force can be experienced. The magnetic fields are stronger near the poles of the magnet. As the distances decreases from the poles, the magnetic fields lines get weaker.

Therefore, the correct option is (C).

The number of neutron in the atom of the isotope is  50.

Isotopes are different nuclear species—technically, nuclides—of the same element. They both belong to the same chemical element and have the same atomic number (number of protons in their nuclei), but they have distinct nucleon numbers (mass numbers) because they have different numbers of neutrons in their nuclei.

Although the chemical properties of all isotopes of a given element are almost identical, their atomic weights and physical characteristics vary.

The atomic mass of yttrium atom of the isotope is = 89

The atomic number of yttrium atom is = 39

Hence, the proton number of the atom of the isotope is = 39

Total number of proton and neutron in the atom of the isotope is = 89

Therefore, the number of neutron in the atom of the isotope is = 89 -39 = 50.

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When she starts out, he is (40x2.5)= 100 miles ahead of her.

She gains (65-40)= 25 miles on him every hour.

It takes her (100/25)= 4 hours to catch up to him.

It will take Mrs. Cunningham 4 hours to overtake Mr. Cunningham.

To determine how long it will take Mrs. Cunningham to overtake Mr. Cunningham, use the following steps:

1. Calculate the distance Mr. Cunningham travels before Mrs. Cunningham starts:

2. Determine the relative speed at which Mrs. Cunningham is gaining on Mr. Cunningham:

3. Calculate the time it takes for Mrs. Cunningham to cover the distance between them at the relative speed:

Answer: 4 cm

Explanation:

Here in the given situation two forces are acting on the dummy from two perpendicular directions

Since force is a vector quantity so we need to add two or more forces by vector addition method

Now here we know that two forces are perpendicular to each other

So we will use Pythagoras theorem

[tex]F_{net} = \sqrt{F_1^2 + F_2^2}[/tex]

given that

[tex]F_1 = 130.0 N[/tex]

[tex]F_2 = 4500.0 N[/tex]

now plug in all in the above equation

[tex]F_{net} = \sqrt{130^2 + 4500^2}[/tex]

[tex]F_{net} = 4501.9 N[/tex]

So the sensor will report net force as 4501.9 N

The answer is; A.

This occurs for a cell that has no ion channel receptors. These cells have surface receptors that change conformation on the binding by an extracellular ligand on the active site. This change in conformation results in an initiation of a chain cascade of biochemical reactions inside the cell.  An example is cells responding to insulin and glucagon hormone that bind on their surface receptors that invokes cell responses that regulate blood sugar levels in the blood.

fairlr accurate one .........

Answer:

It is Law/C.

Explanation:

I did the test. ✔

When silver is poured into the mould the it will solidify

In this process the phase of the Silver block will change from liquid to solid.

This phase change will lead to release in heat and this heat is known as latent heat of fusion.

The formula to find the latent heat of fusion is given as

[tex]Q = mL[/tex]

here given that

[tex]m = mass = 500 g[/tex]

[tex]L = 111 kJ/kg[/tex]

now we can find the heat released

[tex]Q = 0.5 * 111 kJ[/tex]

[tex]Q = 55.5 kJ[/tex]

So it will release total heat of 55.5 kJ when it will solidify

If a rock is dropped from a bridge, its acceleration remains the same (9.8 m/s², the acceleration of gravity on Earth, no matter how heavy the rock is), and its speed increases at the rate of (9.8 meters per second for every second it falls).

The acceleration of the rock remains the same while the speed increases as the rock moves downwards.

The motion of an object dropped from a certain height is affected by Earth's gravitational influence.

The object's speed increases as the object moves downwards and it will eventually become maximum before the object hits the ground.

Thus, we can conclude that the acceleration of the rock remains the same while the speed increases as the rock moves downwards.

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Answer

80 coils

Explanation

The turn rule of a transformer says that, the amount of voltage induced in the secondary coil is proportional to the number of coil. It is simplified by the ratio:

Np/Ns  =  Vp/Vs

200/Ns  = 25,000/10,000

200 × 10,000  = 25,000Ns

2,000,000 = 25000Ns

Dividing both sides by 25,000,

Ns = 2,000,000/25,000

       = 80 coils

Answer:

The answers is 80 Coils

Explanation:

Right on edge

For the motion of the plane it is given to us that it travel 15.0 km in 15.3 s

So here we can use the formula of average velocity to find it

formula is given as ratio of total displacement and total time

[tex]v = \frac{displacement}{time}[/tex]

here it is given that

[tex]displacement = 15.0 km[/tex]

time = 15.3 s

we need to convert the time into hour as the speed is required in km/h

so we know that

[tex]1 h = 3600 s[/tex]

[tex]t = 15.3 s * \frac{1h}{3600 s}[/tex]

[tex]t = 4.25 * 10^{-3} h[/tex]

now by the above formula

[tex]v = \frac{15.0}{4.25 * 10^{-3}}[/tex]

[tex]v = 3529.4 km/h[/tex]

so the velocity of the plane would be 3529.4 km/h

The student accelerated at a rate of 0.2 m/s², calculated using the final and initial velocities, and the time taken to change velocity.

To calculate the acceleration of the student moving from 1 m/s to 3 m/s in 10 seconds, we can use the formula for acceleration, which is Δv/Δt, where Δv is the change in velocity and Δt is the time taken to change the velocity.

Here, the initial velocity (u) is 1 m/s, the final velocity (v) is 3 m/s, and the time (t) is 10 seconds. The change in velocity (Δv) is v - u = 3 m/s - 1 m/s = 2 m/s. The time (Δt) is 10 seconds. Therefore, the acceleration (Δv/Δt) is 2 m/s / 10 s = 0.2 m/s².

The student therefore accelerated at 0.2 m/s².

A screwdriver is used to insert a screw into a wall stud. Then, using an electric screwdriver, you drive into the wall. The identical task was done, but the electric screwdriver sped up the process.

Therefore, the answer is "Option b".

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The statement which is true about using both a screw driver and an electric screw driver to put a screw in a wall stud is: B. the same work was done, but the electric screw driver increased the rate of work.

Work can be defined as a measure of energy transfer that takes place when an object is moved due to the application of a force along a displacement.

Hence, the work done by an object is the multiplication (product) of the perpendicular force acting on the object and the distance it covers.

Mathematically, work done is given by the formula:

[tex]Work\;done = Force \times displacement[/tex]

Generally, a screw driver and an electric screw driver can be used to perform the same work of put a screw in a wall stud.

However, an electric screw driver has a motor, which makes the speed (work rate) of putting a screw in the wall faster than a screw driver.

Additionally, a screw driver is a mechanical tool and as such it requires more human effort to put a screw in a wall stud, thereby, decreasing the rate of work.

In conclusion, the same work was done by using both a screw driver and an electric screw driver, but the electric screw driver increased the rate of work.

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The answer is Great Chilean, 9.5.

Answer:

Great Chilean, 9.5

Explanation:

Great Chilean earth quake also known as 1960 Valdivia earthquakes. It is the most powerful earthquake ever which is recorded on 22 May 1960.

Various studies suggests that it is placed at between 9.4–9.6 on the scale of magnetic moment.

It occurred in the afternoon and last long for about 10 minutes of period. Then the resulting Tsunami affects the Southern Chile, Japan, Hawaii, the Philippines, Eastern New Zealand and Southern Australia.

And the epicenter of this earthquake is about 570 km.

Because water is more dense than the object but rubbing alcohol is less dense than the object

An object floats or sinks based on the densities of the object and the fluid. Water's higher density and surface tension compared to rubbing alcohol enables certain objects to float in it but sink in rubbing alcohol.

The object's ability to float or sink in a fluid depends on the densities of the object and the fluid. If the object's average density is less than that of the fluid it will float. This is because the fluid, having a higher density, contains more mass and hence more weight in the same volume. The buoyant force which equals the weight of the fluid displaced is thus greater than the weight of the object. On the other hand, an object denser than the fluid will sink.

Water has a higher density than rubbing alcohol thus objects that can float in water may sink in rubbing alcohol if their density is greater than that of the alcohol. Additionally liquids such as water exhibit properties such as cohesion and surface tension which can support objects denser or heavier than the water to some extent until the surface tension is broken. However the surface tension of rubbing alcohol is significantly lower than that of water affecting the floating capability of the object.

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it equals 1224.9999412

The mainly three types of directions exits between velocity and acceleration.

The velocity and acceleration are the vector quantities as having both magnitude and direction. To direction of both factors depends upon the speed. for example, we take a car to observe the direction of these two factors, then there will be no direction when the car is at rest.

When the car moves at uniform velocity then its direction will be forward but there will be no direction of acceleration.

When the car moves with increasing speed continuously, then the direction of velocity and acceleration will be parallel.

When the car is at speed and trying to slow down its speeds, it will create acceleration. In this case, the direction of velocity and acceleration will be in the opposite.

Final answer:

The minimum distance the gazelle must be ahead of the cheetah to have a chance of escape is 112.5 m.

Explanation:

To find the minimum distance the gazelle must be ahead of the cheetah, we need to calculate the distance the cheetah covers in 7.5 seconds when it reaches its maximum speed.

Using the formula:

Displacement = Initial velocity * Time + (1/2) * Acceleration * Time^2

Since the cheetah starts from rest, its initial velocity is 0 m/s. The acceleration is not given in the question, so we can't calculate the exact distance. However, we can use the example provided, where the cheetah accelerates at 4 m/s², to illustrate the calculation.

Let's assume the cheetah's acceleration is 4 m/s². Plugging in the values:

Displacement = (0 m/s) * (7.5 s) + (1/2) * (4 m/s²) * (7.5 s)^2

Displacement = 0 + (1/2) * 4 m/s² * 56.25 s²

Displacement = 0 + 2 * 56.25 m = 112.5 m

Therefore, the minimum distance the gazelle must be ahead of the cheetah is 112.5 meters.

There will be the following forces:

Force of gravity directly down.

The normal force perpendicular to the hill.

The braking force directed uphill.

The frictional force directed uphill.

All components of the force acting on the car are:

• The Normal force perpendicular to the surface of the car.

• The force of gravity in downhill direction.

• The breaking force in the uphill direction.

• The friction force in the uphill direction.

Further Explanation:

Free body diagram is the graphical representation or illustration of all the forces applied on the body with their directions. This helps us to visualize all the applied forces on the body with their directions and make us possible to solve complex problems based on kinematics.

Given:

The inclination of the road is [tex]20^\circ[/tex].

Concept:

The free body diagram is drawn as shown in Figure 1.

The car is moving on incline hill making an angle [tex]20^\circ[/tex] with the plane surface. When sudden break is applied to the car it skids to some distance. As soon as the brakes are applied, the car experiences a friction force due to brakes and starts slowing down.

The friction force offered by the hill is dependent on the normal force which is equal to the component of the weight acting perpendicular to the road.

The coefficient of static friction [tex]\mu[/tex] is depend upon the nature of surface of the irregularities. The friction force acts in the direction opposite to the motion.

The car has its normal force and it is the component of the contact force which is always perpendicular to the surface of the object.

The car has component of the force in the downward direction along the hill due to gravity called as weight. It’s magnitude depend upon the mass of the body and expressed as [tex]mg[/tex]. the term [tex]g[/tex] is called acceleration due to gravity and it has a constant value of [tex]9.81\text{ m/s}^2[/tex].

Therefore, the all the force acting on the car are given below.

• The Normal force perpendicular to the surface of the car.

• The force of gravity in downhill direction.

• The breaking force in the uphill direction.

• The friction force in the uphill direction.

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Answer Details:

Grade: Middle school

Subject: Physics

Chapter: Kinematics

Keywords:

Friction, acceleration, slammed, break, car, skidding, net stop, going down, 20degree, hill, components, force, force acting on car, weight, normal.