The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The acceleration after starting from rest is __________
Fill in the blank(s) with correct word
4 m/s2
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Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction. The particle with both forces acting
A) is brought to a rapid halt. B) decelerates gradually to a halt. C) continues at the speed it had when it encountered the second force. D) theoretically tends to accelerate toward the speed of light. E) none of the above
The greatest variation in size, mass, and luminosity occurs in:
A) globular clusters. B) elliptical galaxies. C) spiral and barred spiral galaxies. D) type I vs. type II irregulars. E) Seyfert galaxies.
A parallel plate capacitor with an air dielectric is attached to a voltage source and charged. The voltage source is removed, and then the plates are separated to double their previous distance. What happens to the potential difference between the plates when they are separated?
A. it doubles B. it quadruples C. it halves D. it is diminished by a factor of 4 E. it stays the same
Armor asteroids cross into the orbit of which planet?
a. Mercury b. Venus c. Earth d. Mars e. Jupiter