To observe a spectroscopic binary, we must be able to see both stars individually
Indicate whether the statement is true or false
F
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A bicycle wheel has an outside diameter of 66 cm. How far does a point on the rim travel when the wheel rotates through an angle of 70°?
What will be an ideal response?
The two smallest planets, Mercury and Pluto, have no moons
Indicate whether the statement is true or false
Starting from rest, a car accelerates down a straight road with constant acceleration a for a time t, then the direction of the acceleration is reversed, i.e., it is -a, and the car comes to a stop in an additional time t, the time for the whole trip being 2t. At what time, or times, is the average velocity of the car for the trip equal to its instantaneous velocity during the trip?
a. There is no such time. b. It is at the halfway point at t. c. This occurs at 2 times, at 0.5 t and 1.5 t. d. This occurs at 2 times, at 0.707 t and 1.293 t.
A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
a. 5.0 N b. 3.8 N c. 4.2 N d. 4.6 N e. 6.5 N