How much force is required to raise a 1000-kg block of concrete to the surface of a freshwater lake?
Answer: 5539 N
A lead bullet traveling at 200 m/s strikes a tree and comes to a stop. If half the heat produced is retained by the bullet, by how much does its temperature increase?
[specific heat capacity of lead = 0.13kJ/(kg ºC)]?
Answer: 80ºC
A tire contains air at a gauge pressure of 2 bar at 15ºC. If the tire’s volume does not change, what will the gauge pressure be when its temperature is 38ºC?
Answer: 2.24 bar
A gas sample of 0ºC is heated until the average velocity of its molecules doubles. What is its new temperature?
Answer: 819ºC
