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ladessa [460]
3 years ago
15

In order to slide a heavy desk across the floor at constant speed in a straight line, you have to exert a horizontal force of 40

0 Newtons. Compare the 400-Newton horizontal pushing force F to the frictional force f between the desk and the ground.
1. F < f; the frictional force is greater than the pushing force since it is such a heavy desk.
2. F = f from Newton’s first law.
3. F > f; the frictional force is always less than any other force acting on the object.
4. It depends on the direction the desk moves. 5. F = f from Newton’s third law.
Physics
1 answer:
san4es73 [151]3 years ago
3 0

Answer:

F = f from Newton’s first law.

Explanation:

since the desk is moved in a straight line at a constant speed, newton first law tell us that the two forces must be equal.

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. since the table has been set in motion by the 400 N force, it will remain in motion unless it is been acted upon by an external force, and this means that the 400 N must be equal to the frictional force for it to have been in motion in the first instance.

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If the window is 11 m above the ground, find the time the stone is in flight.
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d=vi*t+(1/2)gt²

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1. the most suitable cutting process to use on ferrous metals such as straight carbon steel is
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A water wheel rotates with a period of 2.26 s. If the water wheel has a radius of l.94 m,
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Answer:

The correct answer is B)

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When a wheel rotates without sliding, the straight-line distance covered by the wheel's center-of-mass is exactly equal to the rotational distance covered by a point on the edge of the wheel.  So given that the distances and times are same, the translational speed of the center of the wheel amounts to or becomes the same as the rotational speed of a point on the edge of the wheel.

The formula for calculating the velocity of a point on the edge of the wheel is given as

V_{r} = 2π r / T

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The answer is left in Meters/Seconds so we will work with our information as is given in the question.

Vr = (2 x 3.14159 x 1.94m)/2.26

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Cheers!

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