The resistance of a conducting material depends on its
a. composition.
b. length.
c. diameter.
d. temperature.
e. all of the above
e
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The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest in m/s is
a. 0. b. 2. c. 4. d. 8. e. 16.
What is the Sun made up of?
a. rock b. metal c. ice d. hot gas e. water
Power: The heating element of a toaster is a 5.4-m length of nichrome wire of diameter 0.48 mm. The resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ? ? m. The toaster is designed to operate at a voltage of 120 V. How much power does it draw in normal operation?
A. 370 W B. 360 W C. 380 W D. 400 W E. 410 W
A 0.10g flea, having lept from the surface of a dog’s cranium, is observed to be moving at 1.25m/s when it is 5.00cm above the position from which it leapt. What was the elastic potential energy stored in its legs before its leap?
a. 
b. 
c. 
d. 
e. 
f. 