How much energy is released when 2.8 kg of diethyl ether freezes?

Impulse and Momentim / Work, energy and power questions?

• Work, energy, and power questions: 1)A 1.83 kg block slides down a ramp from a height of 4.09 m. The block has a speed of 3.85 m/s when it reaches the bottom. There is friction. What is the work (in J) done by gravity? 2) In the previous question, what is the work (in J) done by friction? 3) A 1.66 kg object is suspended from a spring with k = 18.5 N/m. The mass is pulled 0.456 m downward from its equilibrium position and allowed to oscillate. What is the maximum kinentic energy of the object in J? 4) A wrecking ball pendulum of length 8.24 m is released from rest at an angle of 19.7 º from the vertical. What is the maximum speed of the pendulum? 5) A spring compressed by 6.49 cm is used to propel a 66.4 g pellet vertically upward to a maximum height of 8.08 m. What is the spring constant in N/m)? Impulse questions: 1) Lee has a mass of 57 kg and ice skates with a speed of 5.48 m/s. She collides into Mat (86.8 kg) who is standing still on the ice. They move off together. What is their final speed in m/s? 2) A 11.4-kg gun at rest contains a 0.003-kg bullet. When fired, the bullet leaves the gun with a forward velocity of 184 m/s. What is the recoil velocity of the gun in m/s? 3) A 68.2 g ball moving to the right at 18.8 m/s is struck by a bat causing it to move to the left with a speed of [y] m/s. If the bat and ball are in contact for 0.01902 s, what is the average force in N exerted by the ball on the bat? 4) A 69.5-kg boy running at 9.25 m/s jumps onto a stationary cart. They move off together at 3.4 m/s. What is the mass of the cart in kg? 5) A 123 kg football player running 4.85 m/s in the positive direction tackles a 97.6 kg opponent running toward him at 10.0 m/s and holds on. What is their velocity in m/s just after the collision? I don't need answers since the page these questions came from change the numbers every time I refresh the page. I really just need to know how to do the work for some of these questions. Any help is sincerely appreciated!

• Answer:

  wow