AP Physics 1mediummcq1 pt
A wheel spins at 10 rad/s when a constant 2.0 N·m frictional torque acts. If I = 4.0 kg·m², the wheel stops in
A.20 s
B.10 s
C.40 s
D.5.0 s
Explanation
Core Concept
α = τ/I = 0.50 rad/s²; t = ω/α = 10/0.50 = 20 s.
Correct Answer
A20 s
More Unit 7: Torque and Rotational Motion practice questions
- easyFor a rotating system, angular momentum remains constant under which condition?
- mediumA 0.60 kg ball swings in a circle of radius 0.50 m with period 0.40 s (π ≈ 3.14). Its angular momentum about the center is about
- mediumA 2.0 kg mass on a 1.0 m string is whirled so its angular momentum is 8.0 kg·m²/s. Its speed is
- easyFor rolling without slipping, the point of contact with the ground is
- hardA cylinder rolls down a ramp from height 1.8 m (I = ½mr², g = 10 m/s²). Its speed at the bottom is about
Practice more AP Physics 1 questions with full explanations
Practice Unit 7: Torque and Rotational Motion Questions →