A child is riding on a merry-go-round, which is accelerating
What is the relationship between the angular speed ? and the angular acceleration ? of the merry-go-round when the tangential and centripetal accelerations of the child are equal?
? = ?2
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Scientists are able to use the theories of physics to describe the conditions of the universe back to:
A) the moment of the Big Bang. B) the end of the Planck Epoch. C) the beginning of GUT. D) the end of the Radiation Era. E) the Recombination Epoch.
One cat meowing produces a sound intensity level of 55. db
(a) What would be the sound intensity level of 2 cats meowing? (b) ... of 10 cats meowing? (c) ... of 100 cats meowing?
A 1000-kg car approaches an intersection traveling north at 20.0 m/s
A 1200-kg car approaches the same intersection traveling east at 22.0 m/s. The two cars collide at the intersection and lock together. Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision? A) 29.7 m/s in a direction 47.7° east of north B) 21.1 m/s in a direction 47.7° west of south C) 15.1 m/s in a direction 52.8° east of north D) 21.1 m/s in a direction 52.8° east of north E) 21.1 m/s in a direction 47.7° east of north
Proportional Reasoning: A car moving initially with speed v0 slows down with an acceleration of magnitude a and comes to a full stop after traveling a distance d. What was the speed of the car when it had traveled half that distance, d/2?
A. v0/2
B. v0/4
C. v0/
D. v0/8