Physics – Case study


  1. A 0.01 kg bullet is launched with a muzzle velocity of 850 m/s. It is fired from a 308 Winchester with a mass of 3.2 kg. What is the recoil velocity of the weapon?
  2. A 0.01 kg object is 200 meters above the ground. What is its potential energy?
  3. An athlete in training can run up a flight of stairs in 10 seconds.  If he weighs 800 N and climbs a total height of 4.0 m, how much power does this require?
  4. A ball is thrown straight up with an initial speed of 17.0 m/s. How high will the ball travel above the point where it leaves the thrower’s hand when it stops moving up?  Ignore air resistance.
  5. Calculate the heat energy (in calories) required to make a pot of coffee containing 750 g of water that warms from 23°C to 99°C. The specific heat capacity for water is 1 cal/(g⋅°C)

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