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wel
3 years ago
7

a 45 kg sled is pulled down a sidewalk with a horizontal rope. a force of 625 N is applied and the coefficient of kinetic fricti

on is 0.5. determine the horizontal acceleration of the sled
Physics
1 answer:
umka2103 [35]3 years ago
8 0
I dont know so pls AHHHHH
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An exoplanet is in an elliptical orbit around a distant star. At its closest approach, the exoplanet is 0.540 AU from the star a
atroni [7]

Answer:

0.71121 km/s

Explanation:

v_1 = Velocity of planet initially = 54 km/s

r_1 = Distance from star = 0.54 AU

v_2 = Final velocity of planet

r_2 = Final distance from star = 41 AU

As the angular momentum of the system is conserved

mv_1r_1=mv_2r_2\\\Rightarrow v_1r_1=v_2r_2\\\Rightarrow v_2=\frac{v_1r_1}{r_2}\\\Rightarrow v_2=\frac{54\times 0.54}{41}\\\Rightarrow v_2=0.71121\ km/s

When the exoplanet is at its farthest distance from the star the speed is 0.71121 km/s.

7 0
3 years ago
a boat sails along the shore. to an observer, the boat appears to move at a speed of 3m/s, and a man on the boat walking foward
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It is 6.7s. you need to slove the promble
6 0
3 years ago
What charge does aluminum have?
Leya [2.2K]
AI has a charge of +3........................
7 0
3 years ago
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to lift a load to roof, you apply 21 n of force to a pulley. the pulley applies 21 n of force to the load. what is the mechanica
MariettaO [177]

Answer:

The mechanical advantage of the pulley is 1.

Explanation:

The mechanical advantage of the pulley is given as

MA=\frac{F}{f}

Here, MA is represent for the mechanical advantage of the pulley, F is load for lift and f applied force.

Given F =21 N and f= 21 N.

Substitute the given values, we get

MA=\frac{21N}{21N}

MA = 1.

Thus, the mechanical advantage of the pulley is 1.

7 0
4 years ago
Which process changes substances into new substances with new properties?
Y_Kistochka [10]

Answer:

The answer to your question is: Chemical change

Explanation:

Chemical Change  is a change where substances change their properties because new substances are obtain. This is the right answer.

Compressibility is a property in which a substance is compressed but it continous being the being so this answer is wrong.

Malleability  is a property in whcih substances are flattened into thin sheets but they don't change their properties. This answer is wrong.

Physical Change is a change in which a substance changes its physical state but the properties are the same than the original substance, this answer is wrong.

4 0
3 years ago
Read 2 more answers
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