1. If a car goes around a curve at half the speed, the centripetal force on the car is...
a.) twice as big.
b.) four times as big.
c.) half as big.
d.) one-fourth as big.

2. What is the gravitational force between two trucks, each with a mass of 2.0 x 10^4 kg, that are 2.0 m apart?

3. The gravitational force between two masses is 36 N. What is the gravitational force if the distance between them is tripled? (G=6.673 x 10^-11 Nxm^2/kg^2).

4. A car goes around a curve of radius r at a constant speed v. What is the direction of the net force on the car?

Please show your work, the formula(s) used and the answer.

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Solution Summary

The forces in a circular motion are analyzed. The gravitational force between two masses are given.

In uniform circularmotion, the acceleration is perpendicular to the velocity at every instant. Is this true when the motion is not uniform, that is, when the speed is not constant?

Please see the attached.
I'm having a tough time understanding the simple elements of circularmotion and the force vectors (horizontal, vertical and normal) that results from this motion.
Please explain in simple terms if possible.
See attached.

The Moon revolves arond the earth in 27.3 days in a nearly circular orbit with a radius of 3.8 x 10^5 km. Assuming that the Moon's orbital motion is a uniform circularmotion, what is the Moon acceleration as it "falls" toward the earth?

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Find (a) the amplitude and (b) the period of this motion.

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Hi. Can someone show me how to do the the following problem?
"A mass M of 2.71 kg is attached to the end of a string whose length is 0.640 m, and is whirled in a vertical circle in the same radius about a fixed point. Find the magnitude of the tension when the mass is at the top if its speed at the top is 5.73 m/s."
(I don

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A crate is resting on a ramp that is inclined at an angle above the horizontal. As it increased, the crate remains in place until it reaches a value of 29.2°. Then the crate begins to slide down the slope.
(a) Determine the coefficient of static friction between the crate and the ramp surface.
(b) The coefficient of kinet