Buoyancy: A wooden block contains some nails so that its density is exactly equal to that of water. If it is placed in a tank of water and released from rest when it is completely submerged, it will
A. rise to the surface.
B. sink to the bottom.
C. remain where it is released.
Answer: C
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The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 4, when its life track moves straight down to join the main sequence?
A) Its surface temperature and luminosity increase. B) Its surface temperature increases, and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases, and its luminosity increases. E) Its surface temperature and luminosity remain the same.
What were the two primary courses of heating that let the Earth differentiate? Which is more important to us today?
What will be an ideal response?
An electric device delivers a current of 5.0 A to a device. How many electrons flow through this device in 10 s? (e = 1.60 × 10-19 C)
A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020
The block that displaces the greatest volume of water when submerged is a
A) 1-kg block of aluminum. B) 1-kg block of iron. C) 1-kg block of lead. D) all the same