You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the largest possible resistance, you should attach the leads to the opposite faces that measure
A) 3 cm × 5 cm.
B) 3 cm × 8 cm.
C) 5 cm × 8 cm.
D) Any pair of faces produces the same resistance.
A
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A champion athlete can produce one horsepower (746 W) for a short period of time. The number of 16-cm-high steps a 70-kg athlete could ascend in one minute while expending one horsepower is
A. 4. B. 7. C. 65. D. 408. E. 4567.
What are we made of?
A.) Dark energy. B.) Dark matter. C.) Atoms.
According to Newton's Law of Universal Gravitation, if the Moon were three times further from Earth, the force by Earth on the Moon would:
A) increase by a factor of 3. B) decrease by a factor of 3. C) increase by a factor of 9. D) decrease by a factor of 9. E) stay the same.
A 200-N crate rests on a ramp; the maximum angle just before it slips is 21° with the horizontal. What is the coefficient of static friction between crate and ramp surfaces?
a. 0.11 c. 0.38 b. 0.21 d. 0.47