A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. -0.64 kJ
b. -0.40 kJ
c. -0.52 kJ
d. -0.28 kJ
e. -0.76 kJ
D
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The resistance to relative motion of two bodies in contact with each other is called __________
Fill in the blank(s) with correct word
A 25.0-kg object sitting at rest is struck elastically in a head-on collision with a 20.5-kg object initially moving at +4.0 m/s. Find the final velocity of the 25.0-kg object after the collision
a. ?0.90 m/s b. ?3.6 m/s c. +6.6 m/s d. +3.6 m/s e. +15 m/s
A__________is a stellar object with such low mass that it cannot raise its central temperature high enough to sustain hydrogen fusion
A) T Tauri star B) Herbig-Haro object C) brown dwarf D) protostar
Force on a Wire: When the switch is closed in the circuit shown in the figure, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A. a north magnetic pole. B. a south magnetic pole. C. There is not enough information given to answer the question.