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4 years ago

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]4 years ago

3 0

All planets move around the sun

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Joe follows the procedure below to make a compass.1. Move a magnet from the top of a needle to its point fifty times.2. Lay the

pickupchik [31]

Answer:

The purpose of step 1 is to induce magnetism into the needle, so that it retains magnetism and behaves as a magnet after the process.

Explanation:

The method of production the needle magnet in the procedure is the single stroke. This process involves a continuous stroking of a magnetic object (e.g needle) repeatedly for a period or number of times with a permanent magnet. Thus, when the permanent magnet is removed, the object retains magnetism, and behaves like a magnet.

The importance of the stroking process is the turn a magnetic object to a magnet by inducing magnetism into it.

4 0

3 years ago

A 26-kg chandelier hangs from a ceiling on a vertical 4.0-m-long wire. what horizontal force would be necessary to displace its

-Dominant- [34]

First of all you have that the force that is in cable in its vertical posibion is:
Fy = m * g
Fy = (26) * (9.8) = 254.8 N
Then, the force in horizontal direction will be:
Tan (x) = Fy / Fx
Clearing:
Fx = Fy / tan (x)
Substituting values:
Fx = (254.8) / (0.17 / 4)
Fx = 5995.29 N
Answer:
The horizontal force that would be necessary to displace its position 0.17 m to one side is 5995.29 N

8 0

3 years ago

A 325 g iron bucket contains 527 g of water, both at 21.6°C. A 855 g piece of hot steel (T = 352 degrees Celsius) is added to bu

Neporo4naja [7]

Answer:

$T = 18.63 ^oC$

Explanation:

As we know that heat given by the hot piece of iron = heat absorbed by water + ice

As we know that

$c_{iron} = 0.450 J/g ^oC$

also we have

$c_{ice} = 2050 J/kg ^oC$

now we have

$325(0.450)(T-21.6) + 0.527(4186)(T - 21.6) + 0.295(2050)(0 + 22.2) + (0.295)(335000) + 0.295(4186)(T - 0) = 855(0.450)(352 - T)$

$146.25T - 3159 + 2206T - 47650 + 13425.45 + 98825 + 1234.87T = 135432 - 384.75 T$

$3971.87 T = 73990.55$

$T = 18.63 ^oC$

3 0

3 years ago

Two identical metal balls are suspended by insulating threads. Both balls have the same net charge. In this problem, do not assu

Gnesinka [82]

Here in first case both balls will exert electrostatic force on each other

due to this electrostatic force the two balls will repel each other

Apart from this there will be gravitational force on the two balls which is vertically downwards

Now here we know that as the electrostatic force of repulsion will increase between two balls then the angle between the two balls will be more as the horizontal force will separate the two balls

Part b)

As we decrease the charge on one ball then the net electrostatic force between two balls will decrease as we know that this force will depends on the product of two charges

so here the angle between the two balls will decrease and the two balls will come closer.

Also by the free body diagram of two balls we can see that all the forces on the balls are same so the angle made by the ball with the vertical is same for both the balls

so here the angle that ball l makes with the vertical will be equal to the angle that ball 2 makes with the vertical.

7 0

4 years ago

PLSSSSSSS HELP MEHHHHH

Akimi4 [234]

Answer:

I think no 3rd one is correct

Explanation:

It's my opinion maybe it's wrong

******Sorry if it is wrong ******

6 0

3 years ago