A motor with a coil resistance of 12.4 ? is attached to a voltage supply of 66.4 V. What is the current in the motor when it is running at its maximum speed with a back emf of 22.6 V?
a. zero
b. 3.53 A
c. 7.18 A
d. 5.35 A
e. 543 A
b
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A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about
A) 1/2 N. B) 1 N. C) 5 N. D) 7.5 N. E) 10 N.
Two frisky otters slide down frictionless hillsides of the same height but different slopes. The slope of the hill of otter 1 is 30°, while the slope of the hill of otter 2 is 60°
If both start from rest, which otter is moving faster when she reaches the bottom of her hill? A) Otter 1 is moving faster. B) Otter 2 is moving faster. C) The heavier otter is moving faster, no matter which hill she used. D) Both otters have the same speed at the bottom. E) The otter that took the shorter time is moving faster.
Only two elements, mercury and ______________, are liquid at room temperature and atmospheric pressure
a. sodium b. bromine c. phosphorus d. iodine
The wavelength at which a blackbody radiates most depends on its:
A) radius. B) mass. C) magnetic fields. D) temperature. E) direction of motion.