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adelina 88 [10]
2 years ago
10

Assuming Luke has a mass of 90Kg how much potential energy does he have just as he leaves the plane 7620 meters up? Explain how

you know.
Physics
1 answer:
Bond [772]2 years ago
4 0

Answer : P = 6858 KJ

Explanation :

Mass of Luke, m = 90 Kg

Height, h = 7620 m

Acceleration due to gravity, g = 10\ m/s^2

Gravitational potential energy, P = m\times g\times h

So, P = 90\times 10\times 7620

P = 6858 KJ

Hence, the potential energy is 6858 KJ.

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b. the forces of attraction among them limit their motion.


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3 years ago
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Several springs are connected as illustrated below in (a). Knowing the individual springs stiffness k1 = 20 N/m, k2 = 30 N/m, k3
Hatshy [7]

Answer:

The equivalent stiffness of the string is 8.93 N/m.

Explanation:

Given that,

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k_{1}=20\ N/m

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k_{4}=20\ N/m

k_{5}=35\ N/m

According to figure,

k_{2} and k_{3} is in series

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Put the value into the formula

k=\dfrac{30\times15}{30+15}

k=10\ N/m

k and k_{4} is in parallel

We need to calculate the k'

Using formula for parallel

k'=k+k_{4}

Put the value into the formula

k'=10+20

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k_{1},k' and k_{5} is in series

We need to calculate the equivalent stiffness of the spring

Using formula for series

k_{eq}=\dfrac{1}{k_{1}}+\dfrac{1}{k'}+\dfrac{1}{k_{5}}

Put the value into the formula

k_{eq}=\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{35}

k_{eq}=8.93\ N/m

Hence, The equivalent stiffness of the string is 8.93 N/m.

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3 years ago
Objects have a tendency to resist changing their motion. This property is called: *
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We can model a pine tree in the forest as having a compact canopy at the top of a relatively bare trunk. Wind blowing on the top
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The formula for velocity vf = vi + at

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