A uniform solid sphere rolls down an incline of height 3 m after starting from rest. In order to calculate its speed at the bottom of the incline, one needs to know:
a. the mass of the sphere.
c. the mass and the radius of the sphere.
b. the radius of the sphere.
d. no more than is given in the problem.
D
You might also like to view...
Two circular loops carry identical currents, but the radius of one loop is twice that of the other. How do the magnetic fields at the centers of the loops compare?
a) In both cases, the magnetic field at the center would be zero tesla. b) The magnetic field at the center of the larger loop is twice that at the center of the smaller loop. c) The magnetic field at the center of the larger loop is the same as that at the center of the smaller loop. d) The magnetic field at the center of the larger loop is one-half that at the center of the smaller loop. e) The magnetic field at the center of the larger loop is one-fourth that at the center of the smaller loop.
A machine part consists of 0.10 kg of iron (of specific heat 470 J/kg ? K ) and 0.16 kg of copper (of specific heat 390 J/kg ? K). How much thermal energy must be added to the gear to raise its temperature from 18°C to 53°C?
A) 910 J B) 3800 J C) 4000 J D) 4400 J
The electric arc furnace uses ___________% scrap steel.
Fill in the blank(s) with the appropriate word(s).
A bicycle is traveling north at 5.0 m/s. The mass of the wheel, 2.0 kg, is uniformly distributed along the rim, which has a radius of 20 cm. What are the magnitude and direction of the angular momentum of the wheel about its axle?
A) 2.0 kg • m2/s towards the west B) 5.0 kg • m2/s vertically upwards C) 2.0 kg • m2/s towards the east D) 5.0 kg • m2/s towards the east E) 5.0 kg • m2/s towards the west