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Irina-Kira [14]
3 years ago
12

Write the answer to this question. Energy is measured in units called joules(J). Suppose a roller coaster car starts with 78,000

J of potential energy. In a few seconds, it converts two-thirds of this energy into kinetic energy. As it takes a curve, the car doubles its kinetic energy. How much mechanical energy does the car now have?
Physics
1 answer:
kolezko [41]3 years ago
7 0

Answer:78,000 J

Explanation:

Given

Initial Potential Energy P=78,000 J=78 kJ

Total Energy=Potential Energy+Kinetic Energy

initially kinetic energy is zero therefore

Total Energy=Potential Energy

If two-thirds of this energy converts to kinetic Energy

i.e. kinetic Energy =\frac{2}{3}\times 78=2\times 26=52 kJ

As it take curve its kinetic Energy doubles i.e.2\times 52=104 kJ

but total Energy is constant i.e. 78 kJ

therefore there must be a decrease in Potential energy of coaster

78=104+P.E.

P.E.=-26 kJ

Mechanical Energy of car is =sum of kinetic and Potential Energy

=78 kJ=78,000 J

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Explanation:

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Note: As the Diver touches the water,  u = 14 m/s and v = 0 m/s( stopped)

Using,

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Where d = distance moved by the diver in water before its motion stopped, t = time taken before it comes to rest

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Substitute into equation 4

F = 51.7(10+14.7)(9.8)/14.7

F = 851.33 N

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