The interstellar clouds called molecular clouds are ________
A) clouds that are made mostly of complex molecules such as carbon dioxide and sulfur dioxide
B) the clouds in which elements such as carbon, nitrogen, and oxygen are made
C) the cool clouds in which stars form
D) the hot clouds of gas expelled by dying stars
C
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A star cluster of age 100 million years contains no type O stars
Indicate whether the statement is true or false
A trapeze artist, with swing, weighs 700 N; he is being held to one side by his partner so that the swing ropes make an angle of 40.0° with the vertical. In such a condition of static equilibrium, what is the tension in the rope?
a. 9.1E+2 N b. 5.4E+2 N c. 700 N d. 1.4E+3 N e. 9.6E+2 N
A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J
Two objects, one less massive than the other, collide elastically and bounce back after the collision. If the two originally had velocities that were equal in size but opposite in direction, then which one will be moving slower after the collision?
a. The less massive one. b. The more massive one. c. The speeds will be the same after the collision. d. There is no way to be sure without the actual masses.