) A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is
A) less.
B) greater.
C) the same.
Answer: A
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What causes some asteroids leave the asteroid belt and sometimes approach Earth?
A. Because Earth's gravitational field attracts them. B. Because Jupiter's gravitational field ejects them. C. Because they crash into one another and get ejected.
A 1200-kg car is pulling a 500-kg trailer along level ground. Friction is negligible. The car accelerates with an acceleration of 1.3 m/s2. What is the force exerted by the car on the trailer?
A) 550 N B) 600 N C) 650 N D) 700 N E) 750 N
Three masses are moving along the x-axis. Their masses and velocities are m1 = m with v1 = v, m2 = 2m with v2 = 2v, and m3 = 3m with v3 = –3v (the minus sign indicating this velocity is in the negative x-direction). The three masses collide and stick together in a completely inelastic collision. What is the resultant velocity of the combined mass?
a. 0, since their combined momentum is zero. b. –2v/3 c. 14v/3 d. –v
In what direction does a comet's tail point?
A. along the comet's orbit in the direction the comet is moving B. toward the Sun, pulled by its gravity C. away from the Sun D. perpendicular to the comet's orbit E. trailing the comet in its orbit