When you walk, you push on the floor to the left and the floor
A) also pushes on you to the left.
B) pushes you to the right.
C) both of these simultaneously.
D) can only wish it could push on you.
E) none of the above
Answer: B
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A variable resistor has a voltage of 12.0 V placed across it. If the resistance is increased 20%, what happens to the current through it?
A. it increases 20% B. it increases 25% C. it decreases 20% D. it decreases 25% E. it decreases 17%
Radiation: Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to the power emitted by object A?
A. 1.7 B. 2.8 C. 81 D. 17 E. 21
A horizontal force of 200 N is applied to a 55-kg cart across a 10 m level surface. If the cart accelerates at 3.0 m/s2, then what is the work done by the force of friction as it acts to retard the motion of the cart?
a. -900 J c. -350 J b. -175 J d. -700 J
Both RR Lyrae and Cepheid variable stars are stars that, when on the main sequence, were considered to be:
A) low mass. B) intermediate mass. C) high mass. D) zero-age main sequence. E) blue stragglers.