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Jlenok [28]
3 years ago
12

Please help, thank you

Physics
2 answers:
wlad13 [49]3 years ago
5 0

it might be D but i'm not sure. i hope you find your answer ! :)

IceJOKER [234]3 years ago
5 0
Yeah I’m pretty sure it’s the last one x
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What is the mechanical energy of a 500kg rollercoaster car moving with a speed of 3m/s at the top hill that is 30m high
koban [17]

K.E = 1/2*m*v^2 = 1/2(500)(3)^2 = 2250 J

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2250 + 147000 = 149250

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3 years ago
The Hoover dam is a hydroelectric power plant that converts the energy of falling water into electricity. Which of the following
vlabodo [156]

The correct answer to the question is : B) The weight of the water, and C) The height of the water.

EXPLANATION :

Before coming into any conclusion, first we have to understand potential energy of a body.

The potential energy of a body due to its position from ground is known as gravitational potential energy.

The gravitational potential energy is calculated as -

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We know that weight of a body is equal to the product of mass with acceleration due to gravity.

Hence, weight W = mg

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Hence, potential energy depends on the weight and height of the water.


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3 years ago
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Which laboratory activity involves a chemical change?
Elza [17]
A) leaving a copper penny in vinegar until it turns green
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2 years ago
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the acceleration due to gravity on earth is 9.80 m/s2. if the mass of a giraffe is 1,470 kg, what is the weight of the giraffe?
Brrunno [24]
Weight  = Mass * gravity

             =  1470* 9.8 = 14406 N  ≈ 14,400 N
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Answer:Explanation:

Image result for what does a worm and wheel mechanism do to torque and speed​

Like other gear arrangements, a worm drive can reduce rotational speed or transmit higher torque. ... Each full 360 degree turn of a single start worm advances the gear by one tooth. For a multi start worm the gear reduction equals the number of teeth on the gear divided by the number of starts on the worm.

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