An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)
a. 0.94 W
b. 0.81 W
c. 0.58 W
d. 0.69 W
e. 1.5 W
D
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Which object has the largest magnitude of rotational acceleration?
A. An object starting from rest and reaching 2 rev/s in 20 sec B. An object rotating at 3 rev/s and coming to a stop in 10 sec C. An object rotating at a constant 4 rev/s
An object of mass m rests on a flat table. The earth pulls on this object, exerting a force of magnitude mg. What is the Newton's third law pair force to this pull?
A) The table pushing up on the object exerting the force mg. B) The object pushing down on the table exerting the force mg. C) The table pushing down on the floor exerting the force mg. D) The object pulling upward on the Earth exerting the force mg. E) The table pulling upward on the Earth exerting the force mg.
The Quarternary is a(n)
a. epoch. b. era. c. eon. d. period.
What would you observe when two light waves meet in phase with one another?