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igor_vitrenko [27]
4 years ago
13

A 30 N block is being pulled along a horizontal surface with an acceleration of 6 m/s2 by a rope. The coefficient of kinetic fri

ction between the block and the surface is 0.5. What is the force applied by the rope?
Physics
1 answer:
nata0808 [166]4 years ago
6 0

Answer:

33N

Explanation:

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Suppose you go outside and look at three stars. Star A is blue, star B is white, and star C is red. Which star is the hottest, a
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Two satellites, one in geosynchronous orbit (T = 24 hrs) and one with a period of 12 hrs, are orbiting Earth. How many times lar
VashaNatasha [74]

The distance between the orbits of two satellites is 7.97 m.

Explanation:

Johannes Kepler was the first to propose three laws for the planetary motion. According to him, the orbits in which planets are rotating are elliptical in nature and Sun is at the focus of the ellipse. Also the area of sweeping is same.

So based on these three assumptions, Kepler postulated three laws. One among them is Kepler's third law of planetary motion. According to the third law, the square of the time taken by a planet to cover a specified region is directly proportional to the cube of the major elliptical axis or the radius of the ellipse.

So, T^{2} = r^{3}

Thus, for the geosynchornous satellite, as the time taken is 24 hours, then the radius or the major axis of this satellite is

(24)^{2}= r^{3} \\(2*2*2*3)^{2} = r^{3}\\r = \sqrt[\frac{2}{3} ]{2*2*2*3} =(2)^{2} * (6)^{\frac{2}{3} } =13.21 m

Similarly, for the another satellite orbiting in time period of 12 hours, the major axis of this satellite is

(12)^{2}= r^{3} \\(2*2*3)^{2} = r^{3}\\r = \sqrt[\frac{2}{3} ]{12}  =5.24 m

So, the difference between the two radius will give the distance between the two orbits, 13.21-5.24 = 7.97 m.

So the distance between the orbits of two satellites is 7.97 m.

6 0
3 years ago
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Answer:

Option C: "The rock will slow down and eventually stop"

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Since this is a real event, and not an ideal situation where there is no friction forces acting between the frozen pond and the rock, there is going to exist some force of dynamic friction (even small) acting between them. One can look up coefficients of dynamic friction between similar objects, and realize that some small force will be acting as the rock slides on the surface of the pond. That force acts always opposite the direction of movement, therefore decelerating the rock. The rock's speed will continue reducing in magnitude until it eventually stops.

Then, the selected answer is: "The rock will slow down and eventually stop."

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Mr. Garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is _____.
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The main component of steel is iron ... the mother of all magnetic material.
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