A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes 0.8 s for the wave to travel the 20 m to the opposite tower. If one meter of the rope has a mass of 0.35 kg, find the tension in the tightrope
219 N
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A tennis ball is dropped from rest at the exact same instant and height that a bullet is fired horizontally. Which hits the ground first (ignoring air resistance)?
A. The bullet hits first. B. The ball hits first. C. Both hit at the same time.
At the center of our galaxy, ____
a. material is available to make stars but the region is too cold to support star formation b. large stars are formed by the collision of smaller stars c. stars form at the same rate as they do in the spiral arms d. there is no star formation since there is no gas present e. there is evidence of recent, rapid star formation and supernova explosions
A cat leaps to try to catch a bird. If the cat's jump was at 60° off the ground and its initial velocity was 2.74m/s what is the highest point of its trajectory, neglecting air resistance?
A) 0.29 m B) 0.58 m C) 10.96 m D) 0.19 m
Shock waves occur when
A) the wave source is traveling at a speed greater than the wave speed. B) the frequency of the waves is the resonant frequency of the system. C) the amplitude of waves exceeds the critical shock value. D) the period of the waves matches the lifetime of the waves. E) two waves from different sources collide with each other.