A galaxy with a lot of dark matter would have a high mass-to-light ratio compared to the Sun
Indicate whether the statement is true or false
TRUE
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The solar nebula theory supposes that:
A) the moons of all the planets were not formed from a nebula. B) asteroids formed about half a billion years before the formation of the planets' moons. C) the Sun formed about a billion years before the planets. D) planets form in rotating disks of gas and dust around young stars.
A propeller is spun up from rest to 1500 rpm under the influence of a constant torque in 15.0s. If the work done by the engine in giving the propeller its final angular velocity is 25kJ, what is the torque supplied by the engine?
A. 21Nm B. 11 Nm C. 42 Nm D. 21 Nm E. 130 Nm
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
Two light beams of different frequency but the same intensity fall on a black (totally absorbing) surface, striking perpendicular to the surface. Which of the following statements are true? (There could be more than one correct choice.)
A) The light beams exert no pressure on the surface because light is just energy. B) Both beams exert the same pressure on the surface. C) Painting the surface white would not affect the pressure on it due to these beams. D) If the surface were painted white (totally reflecting), the pressure on it would be less than when it was black. E) The high-frequency beam exerts more pressure on the surface.