If the sum of the external torques exerted on an object is zero, then the sum of the external forces exerted on it must also be zero
A) True
B) False
B
Physics & Space Science
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A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It hits the ground in 2.0 s. How high is the building?
A. 70 m B. 50 m C. 30 m D. 20 m
Physics & Space Science
Which one of the following quantities is the smallest unit of thermal energy?
A) calorie B) kilocalorie C) Btu D) joule
Physics & Space Science
Which of these is NOT considered a fine example of galactic collisions?
A) the Cartwheel Galaxy B) the Antennae Galaxies C) the Whirlpool Galaxy D) M-31 in Andromeda E) M-87 in Virgo
Physics & Space Science
When a sine wave is used to represent a sound wave, the crest corresponds to:
a. rarefaction. b. condensation. c. a point where molecules vibrate at a right angle to the direction of wave travel. d. a region of low elasticity.
Physics & Space Science