Briefly explain why Earth feels a greater tidal force from the Moon than from the Sun, even though it feels a greater gravitational force from the Sun
What will be an ideal response?
Tidal force depends on the difference in the force of gravity across an object. For an object of a given size, the difference is greater when the attracting object is closer. The Moon is much closer to Earth than the Sun, which is why it exerts a greater tidal force.
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If you pound a feather with a hammer, which one feels a greater force?
A) always the feather B) always the hammer C) The size of the force is always exactly the same on both of them. D) If the feather moves, then it felt the greater force. Otherwise the force was the same on both.
Florence, who weighs 120 lb, stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is accelerating upward at 2.0 m/s2?
A) 86 lb B) 1.4 × 102 lb C) 96 lb D) 1.2 × 102 lb E) 1.6 × 102 lb
A horizontal disk 1 m in diameter rotates in air at 25°C. If the disk is at 100°C, estimate the number of revolutions per minute at which natural convection for a stationary disk becomes less than 10% of the heat transfer for a rotating disk.
GIVEN
? A rotating horizontal disk in air
? Diameter (D) = 1 m
? Air temperature (T?) = 25°C
? Disk temperature (Ts) = 100°C
FIND
? The rotational speed (w) at which natural convection becomes less than 10% of the thermal effects
of rotation
ASSUMPTIONS
? Steady state conditions
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for dry air at the mean temperature of 62.5°C
The closed universe is compared to the surface of a(n) ________ in spacetime
Fill in the blank(s) with correct word