A magnetic field exists in a current-carrying coil of wire
A) if it contains a piece of iron.
B) with or without a contained piece of iron.
C) only if the current changes.
Answer: B
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If you do 10 J of work to push 1 coulomb of charge into an electric field, its voltage with respect to its starting position is
A) less than 10 V. B) 10 V. C) more than 10 V. D) none of the above
In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm
What force must be applied on the small piston in order to lift a car weighing 20,000 N on the large piston? Assume the pistons each have negligible weight. A) 6.7 × 103 N B) 5.0 × 103 N C) 2.9 × 103 N D) 2.2 × 103 N
Objects that subtend a larger angle in the eye
A. Are perceived to be smaller B. Are perceived to be larger C. The subtended angle has no effect on perception D. Are farther way
The Sun is a ball of gas that is on fire
Indicate whether the statement is true or false