If one doubles the emfs in a circuit and doubles the resistances in the circuit at the same time, what happens to the currents through the resistors? Assume there are only emfs and resistors in the circuit
a. They stay the same.
b. They double.
c. They quadruple.
d. They halve.
a
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How does the work required to stretch a spring 2 cm compare with the work required to stretch it 1 cm?
a) same amount of work b) twice the work c) 4 times the work d) 8 times the work
Chondritic meteorites provide important clues because they are believed to
A. contain grains from the first material that condensed out of the Solar nebula. B. be the only source of the necessary amino acids required for life. C. be the source of all coal found on Earth. D. contain many rare metals.
A rocket, initially at rest, is fired vertically with an upward acceleration of 10 m/s2 . At an altitude of 0.50 km, the engine of the rocket cuts off. What is the maximum altitude it achieves?
a. 1.9 km b. 1.3 km c. 1.6 km d. 1.0 km e. 2.1 km
The efficiency of a heat engine is defined as the ratio of
A) the heat input at the high temperature to the heat output at the low temperature. B) the heat output at the low temperature to the heat input at the high temperature. C) the work it does to the heat input at the high temperature. D) the work it does to the heat output at the low temperature. E) the work it does to the difference between the heat input from the heat output.