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Tanzania [10]
3 years ago
14

A 50kg skater at rest on a frictionless rink throws a 2kg ball, giving the ball a velocity of 10m/s. Which statement describes t

he skaters subsequent motion?
Physics
1 answer:
Andreas93 [3]3 years ago
3 0

0.4m/s in the opposite direction of the ball.

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A wire has a resistance of 27.2 ohms. It is melted down, and from the same volume of metal a new wire is made that is 3 times lo
solmaris [256]

Answer:

81.6 ohm

Explanation:

For a cable type conductor, the resistance is given by the following formula:

R=\rho \frac{l}{S}

Where:

\rho=Material\hspace{3}resistivity\\l=Cable\hspace{3}length\\S=Cable\hspace{3}cross\hspace{3}section

The problem doesn't give us additional information about resistivity or the cross section of the wire, so let's assume:

S=constant\\\rho=constant

Then, in this case, the resistance of the cable depends only on the length. Therefore, if its resistance was originally 27.2 ohms, if we triple its length, it makes sense that its new resistance is three times the original. Thus:

R=3*(27.2)=81.6ohm

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3 years ago
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A force of 50 N was necessary to lift a rock. A total of 150 J of work was done. How far was the rock lifted? ​
Kitty [74]

Answer:

\boxed {\boxed {\sf 3 \ meters}}

Explanation:

Work is the product of force and distance.

W=F*d

We know the force to lift the rock was 50 Newtons. The work was 150 Joules.

  • 1 Joule is equal to 1 Newton meters.
  • We can convert the units to make the problem simpler later. The work is also 150 Newton meters.

W= 150 \ N*m \\F= 50 \ N

Substitute the values into the formula.

150 \ N*m= 50 \ N * d

We want to solve for distance, so we must isolate the variable. Divide both sides of the equation by 50 Newtons.

\frac{150 \ N*m}{50 \ N }=\frac{50 \ N * d}{50 \ N }

The Newtons will cancel out.

\frac{150 \ m }{50} =d \\3 \ m =d

The rock was lifted <u>3 meters.</u>

7 0
3 years ago
Describe the relationship between input force, output force,<br>and load force.​
g100num [7]

Answer: the relationship between the input force and output force is that, Input Force represents the amount of force that you put into another object (which is considered as the load force) while Output Force represents the force that a specific object has as a result of the input force.

Explanation:

Using a lever as an example, a broom is a lever used to sweep floors, the input force is applied by one of the arm used in sweeping, while the output force is on the other edge of the broom (broom tip)

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