An airplane increases its speed from 100 m/s to 160 m/s, at the average rate of 15 m/s2. How much time does it take for the complete increase in speed?
A) 0.25 s
B) 4.0 s
C) 0.0577 s
D) 17.3 s
E) 8.0 s
B
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David stands 2.5 meters in front of a plane mirror
(a) How far from David is David's image in the mirror? (b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other? (c) If David is 180. cm tall, how tall is his image in the mirror?
A 2.10-kg hammer is transported to the Moon. The radius of the Moon is 1.74 × 106 m, its mass is 7.35 × 1022 kg, and G = 6.67 × 10-11 N ? m2/kg2. How much does the hammer weigh on Earth and on the Moon?
What will be an ideal response?
Rotational Kinetic Energy: A solid uniform 3.33-kg disk has thin string of negligible mass wrapped around its rim, with one end of the string tied to the ceiling, as shown in the figure. The disk is released from rest, and as it falls, it turns as the string unwraps. At the instant its center has fallen 2.25 m, (a) how fast is the center moving, and (b) how much rotational kinetic energy does the disk have?
What will be an ideal response?
A car is moving with a constant speed along a circular track. The car is therefore not accelerating
Indicate whether the statement is true or false