A physicist says that a car accelerating along a level road is being propelled by the road. Defend this statement
What will be an ideal response?
Answer: It's true. The tires are made to rotate by the engine, and the tire surfaces are the only points of contact with the road. The turning tires push backward on the road. Interestingly, the tires can only push backward on the road if the road simultaneously pushes forward on the tires. This forward force is the only force that propels the car along the road. Air resistance occurs also, partly counteracting the propulsion by the road.
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Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBI telescope c. an x-ray telescope d. a radio telescope e. none of the above
When a light bulb is turned on, its resistance increases until it reaches operating temperature. What happens to the current in the bulb as it is warming up?
a. It stays constant. b. It increases. c. It decreases. d. It increases at first and then decreases.
An object is undergoing simple harmonic motion with frequency f = 9.7 Hz and an amplitude of 0.12 m. At t = 0.00 s the object is at x = 0.00 m. How long does it take the object to go from x = 0.00 m to x = 0.048 m?
What will be an ideal response?
When Nellie Newton hangs at rest in the middle of a clothesline, the tension will not be the same in each side of the rope when
A) the lengths of rope on each side are different. B) the angles at each side of the rope are unequal. C) she is in equilibrium. D) none of the above