A stone is dropped from a height of h1 = 3.8 m above the ground. After it bounces, it only reaches a height h2 = 2.3 m above the ground. The stone has mass m = 0.1965 kg. Randomized Variables h1 = 3.8 m h2 = 2.3 m m = 0.1965 kg show answer No Attempt 33% Part (a) What is the magnitude of the impulse I, in kilogram meters per second, the stone experienced during the bounce?

3.0 kg·m/s

Explanation:

We use the equation of motion to determine the velocity with which it hits the ground.

At the rebound, we need to determine the initial velocity.

The impulse, by Newton's second law of motion, is equal to the change in momentum.

In the rebound, u is in opposite direction to v.

Taking g = 9.8 m/s²

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27