Two identical fish, both at sea level, float in two identical aquariums with identical quantities of water. Fish A is in Alaska, so it weighs more than fish B at the equator, since g is larger at sea level in Alaska. Which statement is correct?
a. A comparison is impossible unless they are both floating at the same level.
b. Fish A displaces a greater quantity of water than fish B.
c. Fish B displaces a greater quantity of water than fish A.
d. They both displace the same quantity of water.
e. Fish A has a smaller acceleration than Fish B when equal horizontal forces are applied to each, because Fish A weighs more.
d
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Solar tides are not as strong as lunar tides mostly because the Sun is much farther away than the Moon.
Answer the following statement true (T) or false (F)
A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s b. 2.7 m/s c. 4.9 m/s d. 2.4 m/s e. 3.6 m/s
An astronaut is traveling at a high rate of speed from the Earth to a distant star system. Observers here on Earth note the relativistic effect that the astronaut's clocks run slow. What relativistic effect, if any, does the astronaut observe?
a. Her pulse rate slows. b. The distance from the Earth to the star system has decreased. c. Her clocks run faster. d. There is no relativistic effect to be observed by the astronaut since she is the one doing the moving.
Nitrogen at 30°C and atmospheric pressure enter a triangular duct 0.02 m on each side at a rate of 4 × 10–4 kg/s. If the duct temperature is uniform at 200°C, estimate the bulk temperature of the nitrogen 2 m and 5 m from the inlet.
GIVEN
• Atmospheric nitrogen flowing through a triangular duct
• Bulk inlet temperature (Tb,in) = 30°C
• Width of each side of the duct (w) = 0.02 m
• Mass flow rate (m ) = 4 × 1–4 kg/s
• Duct temperature (Ts) = 200°C (uniform)
FIND
• The bulk temperature
(a) 2 m from the inlet and,
(b) 5 m from the inlet
SKETCH
