You have a machine which can accelerate pucks on frictionless ice. Starting from rest, the puck travels a distance x in time t when force F is applied. If force 3F is applied, the distance the puck travels in time t is
a. x.
b. (3/2)x.
c. 3x.
d. (9/2)x.
e. 9x.
C
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If iron with 4.26 weight percent carbon is cooled to room temperature in a normal manner from the melting temperature, it is called _________cast iron.
Fill in the blank(s) with the appropriate word(s).
Gravitational Force: A very dense 1500-kg point mass (A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table. A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)
What will be an ideal response?
When the Universe was young, it was
A. smaller and less dense. B. bigger and colder. C. bigger and hotter. D. bigger and more dense. E. smaller and hotter.
The attraction of the Moon causes tides on Earth. Because of friction, tidal action slows the rotation of Earth. What happens to the angular momentum of the Earth-Moon system, and does this affect the motion of the moon?
What will be an ideal response?