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Mice21 [21]
3 years ago
15

Someone please help!

Physics
1 answer:
NISA [10]3 years ago
8 0
Do you know what's this unit called? it may help figure out how to do it.
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Answer:

52 / 4 = 13 m/s

Explanation:

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2 years ago
Explain how machines can be useful if the output is always less than the input work
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Because: Some of the work done by the machine is used to overcome the friction created by the use of the machine. ... Work output can never be greater than work input. Machines allow force to be applied over a greater distance, which means that less force will be needed for the same amount of work.

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Crystal kick the 3.0 kg soccer ball horizontally off of the top of a building the building is 6.0 m tall and the ball lands 10.0
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3 0
3 years ago
A 20-kilogram child is riding on a 10-kg sled over a frictionless icy surface at 8.0 meters per second. Calculate the kinetic en
Veseljchak [2.6K]

Answer:

K = 960 J

Explanation:

Given that,

Mass of a child = 20 kg

Mass of a sled = 10 kg

Speed of child on sled = 8 m/s

We need to find the kinetic energy of the sled with the child.

The total mass of child and the sled = 20 kg + 10 kg

= 30 kg

The formula for the kinetic energy of an object is given by :

K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 30\times (8)^2\\\\K=960\ J

Hence, the kinetic energy of the sled with the child is 960 J.

6 0
2 years ago
2. Explain brightness of light using the wave model of light.
Dafna11 [192]
The amplitude of a wave tells us about the intensity or brightness of the light relative to other light waves of the same wavelength.
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2 years ago
Read 2 more answers
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