A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is
A) zero.
B) 1 m/s2.
C) 10 m/s2.
D) none of the above
Answer: B
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Identical point charges Q are placed at each of the four corners of a 3.0-m × 4.0-m rectangle. If Q = 40 ?C, what is the magnitude of the electrostatic force on any one of the charges?
a. 3.0 N b. 2.4 N c. 1.8 N d. 3.7 N e. 2.0 N
According to our theory of solar system formation, what are asteroids and comets?
A) the shattered remains of collisions between planets B) chunks of rock or ice that condensed after the planets and moons finished forming C) chunks of rock or ice that were expelled from planets by volcanoes D) leftover planetesimals that never accreted into planets
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.
The most important effect in clearing the solar nebula of gas and dust was
a. impacts by planetesimals. b. the solar wind. c. the sun's magnetic field. d. the asteroid belt. e. radiation pressure.