The output power of an ideal transformer is
A) greater than the input power.
B) equal to the input power.
C) smaller than the input power.
D) may be any of the above
Answer: B
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A 1000 
resistor is in a circuit with 30.0 mA flowing through it. A voltmeter with internal resistance 1000 
is used to measure the voltage across the resistor. What is the reading from the voltmeter if 30.0 mA still flows in the circuit?
A. 30.0 V B. 29.9 V C. 27.0 V D. 15.0 V E. 3.00 V
Acceleration is greater for a satellite when it is at the
A) apogee (farthest point). B) perigee (closest point). C) zenith. D) same acceleration at all of the above places.
We usually think of friction "opposing motion". Explain how friction assists the motion of a car
What will be an ideal response?
A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s with negligible friction and air resistance. What is the average power delivered by the engine? (1 hp = 746 W)
A) 50 hp B) 60 hp C) 70 hp D) 80 hp E) 90 hp