A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward
At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration?
A) 21.8°
B) 27.7°
C) 30°
D) 34.5°
E) 45°
Answer: A
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At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 30 V, and R = 5.0 k?, at what rate is energy being stored in the capacitor when I = 2.0 mA?
a.
32 mW
b.
40 mW
c.
44 mW
d.
36 mW
e.
80 mW
Proof that Earth revolves around the Sun is obtained by the use of ______________ and the ______________
Fill in the blank(s) with correct word
If no force is acting on an object, the object is
A. at rest. B. slowing down. C. moving with a constant velocity. D. at rest or moving with a constant velocity.
A 20-solar-mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a
A) day. B) week. C) month. D) year. E) century.