We usually think of friction "opposing motion". Explain how friction assists the motion of a car
What will be an ideal response?
Without friction, the turning wheel would not be able to push back on the road causing the reaction force to push the car forward.
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A horse and rider travel in a region in which the vertical component of the Earth’s magnetic field is 0.035mT, while the horizontal component is 0.022mT. Attached to the horse’s bridle is a metal bit, a cylinder approximately 15cm long, in the horse’s mouth that is oriented horizontally. If the horse is galloping at 15m/s, what is the induced potential difference between the ends of the bit?
A. 79mV B. 93mV C. 50?V D. 93?V E. 50mV F. 79?V
A balloon is filled with cold air and placed in a warm room. It is NOT in thermal equilibrium with the air of the room until:
A. it rises to the ceiling B. it sinks to the floor C. it stops expanding D. it starts to contract E. none of the above
You are measuring how velocity changes with time of two stars like the Sun in order to detect their planets
Both stars have a velocity curve with a periods of 2 years, but the maximum size (peak-to-peak amplitude) of the velocity curve of star A is 100 km/s, and for star B it is 200 km/s. What causes this difference? Assume the planets are named after their stars. A) Planet A is farther from Star A than Planet B is from Star B. B) Planet A is closer to Star A than Planet B is to Star B. C) Planet A is more massive than Planet B. D) Planet A is less massive than Planet B. E) Not possible to say, since you're measuring the velocity curve of the stars, not the planets.
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The pressure on A2 is 40 psi. a. True b. False