Why are Uranus's rings darker in color (gray) than Saturn's or Jupiter's?
A. they do not have as much nuclear activity in them, so they do not produce as much light.
B. they have a lot of carbon/soot-like material in them.
C. there is more sunlight incident on Uranus's rings because of its greater distance from the Sun.
D. there is less sunlight incident on Uranus's rings because of its smaller distance from the Sun.
E. they are blocking more light from the stars behind them.
Ans: B. they have a lot of carbon/soot-like material in them.
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A 2.5 cm sphere is maintained at 50°C in either an air stream or a water stream, both at 20°C and 2 m/s velocity. Compare the rate of heat transfer and the drag on the sphere for both fluids.
GIVEN
• A sphere in an air stream or a water stream
• Sphere diameter (D) = 2.5 cm = 0.025 m
• Sphere temperature (Ts) = 50°C
• Fluid temperature (Tf) = 20°C
• Fluid velocity (U?) = 2 m/s FIND
• The rate of heat transfer (q) and the drag force
ASSUMPTIONS
• Radiation is negligible
SKETCH
PROPERTIES AND CONSTANTS
Why is the Moon's cycle of phases (the synodic month) longer than the Moon's orbital period (the sidereal month)?
A) The Moon completes the cycle of lunar phases before it completes a full orbit around Earth. B) The Moon has to complete more than one full orbit around Earth to complete the cycle of lunar phases. C) The Moon orbits Earth faster than Earth orbits the Sun. D) The Moon orbits Earth faster than Earth rotates. E) The lunar month is based on the Moon's orbit, while the sidereal month is based on Earth's orbit.
A box is sliding down an incline tilted at a 12.0° angle above horizontal. The box is initially sliding down the incline at a speed of 1.50 m/s. The coefficient of kinetic friction between the box and the incline is 0.340
How far does the box slide down the incline before coming to rest? A) 0.920 m B) 2.33 m C) 1.78 m D) 0.720 m E) The box does not stop. It accelerates down the plane.
How does the age of the universe depend on the value of Hubble's constant, and why?
What will be an ideal response?