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const2013 [10]
3 years ago
13

Please help!!! These questions are about specific heat capacity.

Physics
1 answer:
Elodia [21]3 years ago
4 0
The answer 123=777
uvyotvvovvuvyugbgihhvhvvhbbyubhbihbhbh buohjb hjnm

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what is the force if a block of wood with mass 20 kg slides along a frictionless surface at 2 m/s squared
CaHeK987 [17]

Answer:

40 N

Explanation:

F=ma where F is the applied force, m is the mass of object and a is the acceleration.

Since there is no friction, substituting 20 Kg for m and 2 m/s squared for a then we obtain

F=20*2=40 N

5 0
3 years ago
Which is an important step in how an electric motor uses magnetic force to produce motion?
Fiesta28 [93]

Answer:B.As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.

Explanation:

3 0
3 years ago
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You are riding in an airplane that is moving at a speed of 600 km/h. If you walk from the FRONT of the plane TOWARD the BACK of
MatroZZZ [7]

Answer:

600km/h as u are on a platform moving at the speed of 600 km/h where u are moving in relativity to the plane it's self.

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3 years ago
Two brothers, Frank and Dion, are on roller skates and standing still when they push off from one another. Frank's mass is 103.4
tigry1 [53]
Around -3.5 ( might not be completely right ) Frank has a greater mass to he has a low velocity at first, Dion is around half of his weight so he doesn’t have to use as much force to get more than Frank
3 0
2 years ago
If the sign of work is negative,
aivan3 [116]

If the sign of work is negative, that means the force and the motion are in opposite directions.

Let's say you see something roll off of the shelf. You catch it, and you let it down slowly and gently.

Gravity exerted down-force on it and it moved down. Gravity did positive work on it.

YOU exerted UP-force on it and it moved down. YOU did negative work on it.

(Also, the falling object exerted down-force on your hand, and your hand moved down. The falling object did positive work on your hand ! Where did THAT energy come from ? It came from the potential energy that the object had while it was on the shelf. Your hand absorbed that energy on the way down, doing negative work. So the object didn't have any kinetic energy when it reached the floor, and it did NOT splinter the floor or shatter in smithereens. It had barely enough energy left to make a sound when it hit the floor.)

5 0
3 years ago
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