AP Physics 1hardmcq1 pt
A skier of mass 70 kg starts from rest at the top of a 30 m slope with 5.0 m of vertical drop and reaches the bottom at 8.0 m/s (g = 10 m/s²). The energy dissipated by friction is about
A.1300 J
B.3500 J
C.2240 J
D.5740 J
Explanation
Core Concept
mgh − ½mv² = 3500 − 2240 = 1260 J ≈ 1300 J.
Correct Answer
A1300 J
More Unit 4: Energy practice questions
- mediumA 0.30 kg block hits a spring (k = 300 N/m) at 4.0 m/s. The spring's maximum compression is
- easyA motor lifts a 100 kg elevator at a constant 2.0 m/s (g = 10 m/s²). The motor's power output is
- easyA force of 12 N acts on a 3.0 kg block initially at rest on frictionless ice for 2.0 m. The block's final speed is
- easyA 2.0 kg ball is thrown horizontally from a 5.0 m cliff at 4.0 m/s (g = 10 m/s²). Its kinetic energy just before impact is
- hardA rocket engine expels 200 kg of gas per second at 3000 m/s relative to the rocket. The power of the exhaust jet is about
Practice more AP Physics 1 questions with full explanations
Practice Unit 4: Energy Questions →