State one of Kepler's laws of gravitation

2 answers:

7 0

Kepler isn't known for any work on gravitation. The 'laws' named for him all describe the motions of planets. His descriptions were entirely based on observations, made by somebody else and written down over a period of many years. Kepler just described a structure and motions that would produce those observations ... He never said WHY the planets do what they do.

It was NEWTON, a long time after Kepler, who worked on gravity, and showed that with HIS formula for gravity, planets would HAVE TO do what Kepler said they probably do.

jekas [21]2 years ago

3 0

All planets move around the sun

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How much work did the movers do (horizontally) pushing a 41.0-kg crate 10.6 m across a rough floor without acceleration, if the

VLD [36.1K]

Answer:

The required work done is $2555.448~J$

Explanation:

Consider 'F' is the applied force on the crate and 'f' be the force created by friction. According to the figure if ' $\mu_{k}$ ' be the coefficient of friction, then

$f = \mu_{k} \times N = \mu_{k} \times Mg$

where 'M', 'N' and 'g' are the mass of the crate, the normal force aced upon the block and the acceleration due to gravity respectively.

Since the application of force by the movers does not create any acceleration to the block, we can write

$F = f = \mu_{k} \times M \times g = 0.6 \times 41~Kg~ \times 9.8~m~s^{-2} = 241.08~N$

So the work done (W) in moving the crate by a distance s = 10.6 m is

$W = F \times s = 241.08~N \times 10.6~m = 2555.448 J$

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