A child is riding a merry-go-round which completes one revolution every 8.36 s. The child is standing 4.65 m from the center of the merry-go-round
(a) What is the tangential speed of the child?
(b) What is the magnitude of the centripetal acceleration of the child?
(a) 3.49 m/s
(b) 2.63 m/s2
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Most of the modern large optical telescopes are refractors.
Answer the following statement true (T) or false (F)
The leading explanation for the existence of spiral arms is
A) shock waves from cyclic supernovae explosions. B) shock wave from the quasar-like eruption of the Galactic core. C) passages of spiral density waves through the interstellar medium. D) passages of massive globular clusters through the Galactic plane. E) tidal streams of small galaxies being torn up by our monster Galaxy.
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
An inventor wants you to finance construction of a machine that will run at room temperature by using the free thermal energy available in the air itself. Should you invest $100,000? Why or why not?
What will be an ideal response?