Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2 . The magnitude of the velocity of the center of mass of this system of two bodies is
a. less than v1.
b. equal to v1.
c. equal to the average of v1 and v2.
d. greater than v1 and less than v2.
e. greater than v2.
d
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Impulse: A block of mass m = 5.6 kg, moving on a frictionless surface with a velocity of vi = 6.5 m/s to the right, collides with a block of mass M at rest, as shown in the figure. After the collision, the 5.6-kg block recoils with a velocity of vf = 0.70 m/s to the left. If the blocks are in contact for 0.20 s, what is the magnitude of the average force on the 5.6-kg block, while the two blocks are in contact?
A. 202 N B. 192 N C. 182 N D. 34 N E. 162 N
Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it, assuming that air has no effect on the ruler?
A) At least 3.0 cm B) At least 4.9 cm C) At least 6.8 cm D) At least 9.8 cm
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
A. is independent of velocity or acceleration. B. increases when the velocity increases. C. is proportional to the acceleration. D. decreases when the force parallel to the floor increases. E. increases when the force parallel to the floor increases.
During a lunar eclipse, the Moon, Earth, and Sun all lie on the same line, with the Earth between the Moon and the Sun. The Moon has a mass of 7.36 × 1022 kg; the Earth has a mass of 5.98 × 1024 kg; and the Sun has a mass of 1.99 × 1030 kg
The separation between the Moon and the Earth is given by 3.84 × 108 m; the separation between the Earth and the Sun is given by 1.496 × 1011 m. (a) Calculate the force exerted on the Earth by the Moon. (b) Calculate the force exerted on the Earth by the Sun. (c) Calculate the net force exerted on the Earth by the Moon and the Sun.