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kari74 [83]
3 years ago
5

An escalator carries you from one level to the next in an airport terminal. The upper level is 4.4m above the lower level, and t

he length of the escalator is 7.3m . Assume that your mass is 63kg .Part AHow much work does the up escalator do on you when you ride it from the lower level to the upper level?Express your answer to two significant figures and include the appropriate units.W =___________.Part BHow much work does the down escalator do on you when you ride it from the upper level to the lower level?Express your answer to two significant figures and include the appropriate units.W =___________.
Physics
1 answer:
horrorfan [7]3 years ago
6 0

Answer:

Part a)

W = 2716.5 J

Part B)

W = -2716.5 J

Explanation:

Part A)

While escalator is moving up work done to move the person upwards is given as

W = mgh

here we know that

m = 63 kg

h = 4.4 m

now we have

W = 63 \times 9.8 \times 4.4

W = 2716.5 J

Part B)

Work done while we move from up to down

So we have

W = - mgh

so we have

W = -2716.5 J

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v= 17.082m/s

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A person gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. The cart travels for
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Answer:

Only a backward force is acting, no forward force.

Explanation:

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3 years ago
The speed of sound in room temperature (20°C) air is 343 m/s; in room temperature helium, it is 1010 m/s. The fundamental freque
Lera25 [3.4K]

Answer: f = 927.55Hz

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λ = 4L.

v = fλ

343 = 315 * 4L

343 = 1260 * L

L = 343/ 1260

L = 0.27m

In the same tube of length L = 0.27m but different medium ( helium), the speed of sound is 1010m/s.

The length of tube and wavelength are related by the formulae below

L = λ/4, λ=4L

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4 0
3 years ago
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pochemuha

Answer:

energy is equal to 1000 J

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When the jumper is in the tent, he has a given height, this height gives him a gravitational potential energy, which forms his initial mechanical energy of 1000 J. After jumping, this energy is converted into elastic energy of the rope plus a remainder of potential energy gravitational, it does not reach the ground, but as the friction is negligible the total mechanical energy is conserved, therefore its energy is equal to 1000 J

This is a case of energy transformation, but the total value of mechanical energy does not change

         

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inna [77]

Answer:

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