When a ball is thrown straight up, which of the following is zero at its highest point?
A) acceleration
B) displacement
C) velocity
C
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Stars in the same constellation
a. probably formed at the same time. b. must be part of the same cluster of stars in space. c. must have been discovered at about the same time at the same location in space. d. may actually be very different distances away from the observer and from each other.
Rotational Kinetic Energy: Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A. The small sphere arrives first. B. Both reach the bottom at the same time. C. The large sphere arrives first.
According to the main sequence turn-off points of the oldest globular clusters, they are about:
A) 4.5 billion years old. B) 6.8 billion years old. C) 10 billion years old. D) 12 billion years old. E) 16 billion years old.
What is the difference between re-radiating surfaces and black body surfaces?
What will be an ideal response?