A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. The ball to reach the ground first is the
A) regular ball.
B) lead-filled ball.
C) same for both
Answer: B
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The spherical component is the __________
a. halo b. bulge c. halo and bulge d. dark matter
Two identical small conducting spheres are separated by 0.60 m. The spheres carry different amounts of charge and each sphere experiences an attractive electric force of 10.8N
The total charge on the two spheres is -24 ?C. The two spheres are now connected by a slender conducting wire, which is then removed. The electric force on each sphere is closest to A) 5.4 N, repulsive. B) zero. C) 3.6 N, attractive. D) 5.4 N, attractive. E) 3.6 N, repulsive.
Two blocks of different mass are connected by a string. The system is accelerated across a smooth horizontal surface by a force supplied by a rubber band connected to the less massive block. The tension in the connecting string will be
A. the same as the force pulling the leading block. B. greater than the force pulling the leading block. C. less than the force pulling the leading block. D. zero.
An earthquake emits both P-waves and S-waves that travel at different speeds through the Earth. A P-wave travels at 9 000 m/s and an S-wave at 4 000 m/s. If P-waves are received at a seismic station 34.0 s before an S-wave arrives, how far is the station from the earthquake center?
a. 1.22E+5 m b. 4.90E+5 m c. 2.45E+5 m d. 9.42E+4 m e. 1.70E+5 m