The escape velocity is how many times the orbital velocity?
A)
B) 2
C) 2
D) 4
E)
A
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According to modern science, approximately how old is the Sun?
A) 4 1/2 billion years B) 25 million years C) 10,000 years D) 400 million years
A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the highest point of the circle the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
A. 21 N B. 11 N C. 16 N D. 26 N E. 36 N
As an interstellar cloud of hydrogen gas shrinks in size, its temperature increases
A) because thermal energy is converted to radiative energy. B) because kinetic energy is converted to radiative energy. C) because gravitational potential energy is converted to thermal energy.
A 3.0-kg block is on a frictionless horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 2.0 N) acting at an angle of 22° above the horizontal is applied to the block. At what rate is the force P doing work at t = 2.0 s?
a. 2.3 W b. 2.0 W c. 1.4 W d. 1.7 W e. 1.2 W