The force of gravity from one object extends to infinity never going to zero.When we say that gravitation is universal we mean that
a. the Earth exerts gravitational force on objects on its surface
b. the Earth exerts a gravitational force on its moon and vice versa
c. the Earth, moon and sun exert gravitational forces on each other
d. all material objects in the universe exert gravitational forces on one another.
D
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Ball A is dropped from the top of a building. One second later ball B is dropped from the same point. As time progresses, the distance between them
A. increases. B. decreases. C. remains constant. D. need more information
The Algol paradox is explained by considering
a. the degenerate nature of the hydrogen on the surface of the white dwarf. b. synchrotron radiation c. the rate of expansion of the shock wave inside the supernova. d. the rotation rate of a neutron star. e. mass transfer between the two stars in a binary system.
A 2.0-kg block slides on a rough horizontal surface. A force (magnitude P = 4.0 N) acting parallel to the surface is applied to the block. The magnitude of the block's acceleration is 1.2 m/s2 . If P is increased to 5.0 N, determine the magnitude of the block's acceleration
a. 2.1 m/s2 b. 2.3 m/s2 c. 1.9 m/s2 d. 1.7 m/s2 e. 3.2 m/s2
Two parallel wires carry currents in the same direction and exert a force on each of magnitude F for each meter of length. One of the currents is now reversed in direction and doubled in magnitude. What are the resulting magnitude for the force per meter of length and its direction relative to the wires?
1.2F, attractive 2.2F, repulsive 3.4F, attractive 4.4F, repulsive