Question 3 of 5

Two carts on an air track have the same mass and speed and are traveling toward each other. If they collide and stick together,

lora16 [44]

Answer:

$p = 0$ , $K_{A} = m\cdot v^{2}$ (before collision), $K_{B} = 0$ (after collision).

Explanation:

The total momentum is obtained using the Principle of Momentum Conservation:

$m\cdot v_{A} - m \cdot v_{A} = 2\cdot v_{B}$

It is trivial to find that final speed and total momentum of the system are zero:

$p = 0$

The total kinetic energy of the system becomes zero due to the inellastic collision and the same masses and speeds. Total kinetic energies before and after collision are, respectively:

$K_{A} = m\cdot v^{2}$

$K_{B} = 0$

7 0

3 years ago

The plates of a parallel plate capacitor are separated by d = 1.6 cm. The potential of the negative plate is 0 V, and the potent

yaroslaw [1]

Answer:

The electric field between the plates is 1875 V/m.

Explanation:

Given that,

Separated d=1.6 cm

Potential of negative plate = 0 V

Potential halfway between the plates = 15 V

We need to calculate the total potential

Using formula of potential

$V=2\times\text{Potential halfway between the plates}$

Put the value into the formula

$V=2\times15$

$V=30\ V$

We need to calculate the electric field between the plates

Using formula of electric field

$E=\dfrac{V}{d}$

$E=\dfrac{30}{1.6\times10^{-2}}$

$E=1875\ V/m$

Direction is negative as the field always points from positive to negative plate

Hence, The electric field between the plates is 1875 V/m.

5 0

3 years ago

A missle is flying at a speed 125 m/s. if the missle has a mass of 125 kg. What’s it’s kinetic energy

Fynjy0 [20]

Answer:

$976562.5\ Joules$

Explanation:

$We\ are\ given:\\The\ mass\ of\ the\ missile=125\ kg\\The\ velocity\ of\ the\ missile=125\ m/s\\Hence,\\As\ we\ know\ that,\\Kinetic\ energy\ possessed\ by\ an\ object\ with\ mass\ m\ moving\\ with\ a\ velocity\ v:\\E_k=\frac{1}{2}mv^2\\Here,\\The\ Kinetic\ Energy\ possessed\ by\ the\ missile=\frac{1}{2}*125*(125)^2=976562.5\ Joules$

6 0

3 years ago

How is capacitance related to the distance between the plates of a capacitor?

svetlana [45]

Answer:C

Explanation: I studied, and C is correct

5 0

3 years ago

A 2.0kg pendulum swings from point A of a height of 0.10m to a point B of the same height. The heights are relative to the lower

mr_godi [17]

Please press “Thanks!” after viewing my answer:
The change in Gravitational Potential Energy (GPE) is actually 0! Think about it:
What is the formula for it?
Well, GPE = mgh.
So, when the height is the same in both cases, we know the gravitational potential energy is the same. Therefore, change in GPE = 0.
Sure, GPE did transform to KE during the swing, but all of that KE transformed back into the original amount of GPE.

Hope this helped! Please press “Thanks!”

4 0

3 years ago