Two dogs, Rover and Fido, run on a level frictionless surface. Rover runs eastward with a momentum of 24 kg . m/s, and Fido runs northward with momentum 10 kg . m/s
They make a sudden perfectly inelastic collision. What is the magnitude of their combined momentum after the collision?
A) 14 kg . m/s
B) 26 kg . m/s
C) 34 kg . m/s
D) It cannot be determined without knowing the masses and velocities of the dogs.
B
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Which of the following best describes Pluto in terms of the general characteristics of terrestrial and jovian planets?
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A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The brick is kept from sliding down the plane by an ideal spring that is aligned with the surface and attached to a wall above the brick
The spring has a spring constant (force constant) of 120 N/m. By how much does the spring stretch with the brick attached? A) 36 cm B) 360 cm C) 24 cm D) 14 cm E) 240 cm
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A. tangent to the trajectory and in the direction opposite the velocity. B. perpendicular to the trajectory. C. horizontal. D. upward.