Jim and Mary are carrying Bob on a horizontal stretcher. The uniform stretcher is 2.00 m long and weighs 80 N. Bob weighs 600 N. Bob's center of gravity is 80 cm from Mary. Jim and Mary are at the ends of the stretcher. The force that Mary is exerting to support the stretcher, with Bob on it, is
A. 550 N.
B. 400 N.
C. 300 N.
D. 280 N.
E. 200 N.
B. 400 N.
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From a stationary position, I observe a moving boxcar, which has a mirror along the front wall, but it is open at the back of the boxcar. I send a flash of light from my flashlight and time the flash of light as it goes to the front of the boxcar and returns to the back of the boxcar. A passenger in the boxcar also times the round trip of the flash of light. Previously I had measured the time
required for the round trip of a flash of light when the boxcar was stationary, and I call this the stationary time. Which two times are the same? a. the time recorded on my watch and the previous stationary time b. the time recorded on the passenger's watch and the previous stationary time c. the time recorded on my watch and the time recorded on the passenger's watch d. None of the times are the same.
A picture window in a house is 3 feet high by 5 feet long. If the window is 50ºF and the outside air temperature is -10ºF, estimate the heat transfer by natural convection from the window.
What will be an ideal response?
What idea of Aristotle’s did Galileo discredit with his experiments on balls rolling on an incline?
Which of the following correctly lists the layers of Earth's atmosphere from the ground upward?
A) troposphere, stratosphere, thermosphere, exosphere B) thermosphere, stratosphere, troposphere, exosphere C) exosphere, stratosphere, thermosphere, troposphere D) troposphere, thermosphere, stratosphere, exosphere