1. Tidal forces are a result of: A. The different magnetic forces acting on diff
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Question
1. Tidal forces are a result of:
A. The different magnetic forces acting on different parts of an object due to the distance between those parts.
B. The different gravitational forces acting on an object due to different massive bodies.
C. The difference in the gravitational force acting on different parts of an object due to the distance between those parts.
D. The different electric forces acting on different parts of an object due to the distance between those parts.
2. The _____ exerts the largest gravitational force on the Earth, and the _____ exerts the largest tidal force on the Earth.
A. Moon, Sun
B.Sun, Moon
C. Jupiter, Moon
D. Moon, Jupiter
E. Sun, Jupiter
3. When do neap tides occur?
A. At full Moon.
B. When the tidal effects of the Sun and Moon augment each other.
C. At new Moon.
D. When the tidal effects of the Sun and Moon partially cancel each other.
4. A large moon orbiting a planet will likely
A. Be torn apart by the planet's tidal forces if it crosses the planet's Roche limit.
B. Be torn apart by the planet's tidal forces if it is outside the planet's Roche limit.
C. Ignore the planet's tidal forces regardless of position because tidal forces only effect the Earth's oceans to create tides.
D. Be torn apart by the planet's tidal forces if it is inside the planet's Roche limit.
5. What does the Roche limit mainly depend on?
A. It mainly depends on the size of the planet, the size of the moon, and the density of the planet.
B. The Roche limit does not depend on these factors.
C. It mainly depends on the size of the moon, the density of the planet, and the density of the moon.
D. It mainly depends on the size of the planet, the size of the moon, and the density of the moon.
E. It mainly depends on the size of the planet, the density of the planet, and the density of the moon.
Explanation / Answer
1) B (The different gravitational forces acting on an object due to different massive bodies)
Tidal forces is an apparent force that stretches a body towards and away from the center of mass of another body due to a gradient (difference in strength) in gravitational field from the other body.Tide in the ocean on earth are created by the gravitational forces of sun and moon
2) B. (Sun, Moon)
The Moon produces a greater tidal force on the Earth than the Sun, even though the Sun exerts a greater gravitational attraction on the Earth than the Moon, because the gradient is less.
And sun exerts maximum gravitaional forces on earth
3) D .( When the tidal effects of the Sun and Moon partially cancel each other.)
Neap tides are especially weak tides. They occur when the gravitational forces of the Moon and the Sun are perpendicular to one another (with respect to the Earth)
4) D (. Be torn apart by the planet's tidal forces if it is inside the planet's Roche limit.)
Roche limit, also called Roche radius, is the distance in which a celestial body, held together only by its own gravity, will disintegrate due to a second celestial body's tidal forces exceeding the first body's gravitational self-attraction.
Inside planets Roches limit the moon will be torn apart by planets tidal forces.
5) E. ( It mainly depends on the size of the planet, the density of the planet, and the density of the moon.)
Roche limit, the closest distance that a celestial body held together only by its own gravity can come to a planet without being pulled apart by the planet's tidal (gravitational) force. This distance depends on the densities of the two bodies and the orbit of the celestial body ( size of the planet)
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