for an object near the surface of the earth, where does its center of gravity lie relative to its center of?

Question

its mass?
A.) the center of gravity lies closer to the source of gravity
B.) the center of gravity lies farther from the source of gravity
C.) both points are the same

2. We know that an object will balance stably if we draw a line stright down from the object's center of mass and the line falls
A.) anywhere outside the object's base
B.) anywhere inside the object's base
C.) only in the center of the object's base
D.) only along the edge of the object's base

3. Which force(s) is(are) associated with rotational motion?
A.) Centrifugal force
B.) centripetal force
C.) both
D.) neither

4.Atoms are
A.) the building blocks of matter
B.) to small to see with the naked eye
C.) the smallest amounts of elements that still retain the chemical properties of the element
D.)all of the above

5.Brownian motion is caused by
A.) Human contact
B.) gravity
C.) invisible particles
D.) heat

Answer 1

Kilohn is almost right. It's just at point 3, where the answer is C actually.

That's because the centripetal force is what curves a body's trajectory and the centrifugal force is caused by inertia, which generates the reaction that corresponds to the centripetal force. (According with Newton's laws, these forces are opposed and equal in module.)

So both of these are associated with the rotational motion, which corresponds with C!

Answer 2

1. B. The center of mass and the center of gravity are not quite at the same spot. This is because the strength of the gravitational force is slightly greater at your feet than at your head.

2. B

3. Either A or C, depending on whether your teacher believes that there is such a thing as centrifugal force or not. Some teach that centrifugal force is OK, others are adamant that it doesn't exist.

4. D

5. C, if atoms count as the "invisible particles." I can also see that it might be "D", since it's the thermal energy in the atoms that cause Brownian motion.

Answer 3

1.C. The centers of mass and gravity are the same.
2.B. Anywhere inside the object's base.
3.A. Centrifugal force. I'm not absolutely sure on this one though.
4.D. All of the propositions are correct I believe, since the 2 first are correct and the last one, I would have been tempted to associate that definition with molecules, but as it says "elements", it should be correct.
5.C. Invisible microscopic particules hitting the tiny object of interest.

Answer 4

for many gadgets the place measurement is heavily decrease than radius of Earth (6000km or so) then the centre of gravity is the centre of mass. the situation arrises the place measurement of merchandise is astronomical, like the moon say, the centre of gravity of the variety of equipment is its Lagrange element (someplace between the earth and moon) and is the element the place the pull of the moon on an merchandise equates to the pull of the earth. in case you place an gadgets com on the earth-moon Lagrange element then it is going to easily sit down there and seem to have not got any internet weight consequence.

Answer 5

I agree with the first person to answer except #3
centripetal force would cause an object to fly straight away from its circular path. centrifugal force balances out centripetal force and keeps the object in the circular path. answer is c