What are tides?
What will be an ideal response?
Tides are caused by small differences in gravitational force. As the Earth and Moon orbit around each other, they attract each other gravitationally. Because the side of Earth toward the Moon is a bit closer, the Moon pulls on it more strongly and that pulls up a bulge. Also, the Moon pulls on Earth a bit more than it pulls on Earth's far side and that produces a bulge on the far side. The oceans are deeper in these bulges, and as Earth rotates and carries you into a bulge, you see the tide creeping up the beach. Because there are two bulges, there are two high tides each day, although the exact pattern of tides at any given locality depends on details such as ocean currents, the shape of the shore, and so forth.The Sun also produces tides on Earth, although they are smaller than lunar tides. At new and full moons, the lunar and solar tides add together to produce extra high and extra low tides that are called spring tides. At first- and third-quarter moons, the solar tides cancel out part of the lunar tides so that high and low tides are not extreme. These are called neap tides.
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Answer the following statement true (T) or false (F)
Two identical spheres each carry a charge of ?82.0 µC. The spheres are separated by a distance of 2.00 m. What is the electric force between the spheres? (ke = 8.99 × 10^9 N·m2/C2)
a. 0.184 N (repulsive) b. 15.1 N (repulsive) c. 30.2 N (attractive) d. 1.47 N (attractive) e. 37.8 N (attractive)
A solid uniform disk is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal
What is the speed of the disk after it has rolled 3.0 m up as measured along the surface of the ramp? A) 4.0 m/s B) 1.9 m/s C) 2.1 m/s D) 6.8 m/s E) 8.0 m/s
A rock is thrown straight up with an initial velocity of 25.0 m/s. What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s2.)
a. 39.9 m b. 15.9 m c. 63.8 m d. 31.9 m e. 47.8 m