A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about the force of static friction f exerted on the block?
A) f > mg
B) f > mg cos ?
C) f > mg sin ?
D) f = mg cos ?
E) f = mg sin ?
E
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You stand at attention with your arm overhead and finger pointing to the sky for 12 hours. During this entire time, your finger traces along the celestial equator in the sky. Where are you located on Earth?
a. North Pole b. South Pole c. equator d. mid-latitude between the equator and the North Pole
Briefly explain why high-mass stars have shorter lifetimes than low-mass stars
What will be an ideal response?
A long cylinder (radius = 3.0 cm) is filled with a nonconducting material which carries a uniform charge density of 1.3 ?C/m3. Determine the electric flux through a spherical surface (radius = 2.0 cm) which has a point on the axis of the cylinder as its center.
A. 5.7 N ? m2/C B. 4.9 N ? m2/C C. 6.4 N ? m2/C D. 7.2 N ? m2/C E. 15 N ? m2/C
The current produced by a common generator is
A) dc. B) ac. C) neither of these