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3 years ago

What is the energy of a 70 kg man running at 4 m/s? How much energy does the man have? *

Physics

1 answer:

vitfil [10]3 years ago

5 0

Answer:

560J

Explanation:

Given parameters:

Mass of the man = 70kg

Velocity = 4m/s

Unknown:

The amount of energy the man has = ?

Solution:

Energy is the ability to do work by a body. A body in motion is said to have kinetic energy and this can be derived using the expression below:

K.E = $\frac{1}{2}$ m v²

m is the mass

v is the velocity

Insert the parameters and solve;

K.E = $\frac{1}{2}$ x 70 x 4² = 560J

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A 148 g ball is dropped from a tree 11.0 m above the ground. With what speed would it hit the ground

forsale [732]

Answer:

14.68m/s

Explanation:

As per the question, the data provided is as follows

Mass = M = 0.148 kg

Height = h = 11 m

Initial velocity = U = 0 m/s

Final velocity = V

Gravitational force = F

Mass = M

Based on the above information, the speed that hit to the ground is

As we know that

Work to be done = Change in kinetic energy

$F ( S) = (\frac{1}{2} ) M ( V^2 - U^2 )$

$M g h = (\frac{1}{2} ) M ( V^2 - U^2 )$

$g h = (\frac{1}{2} ) ( V^2 - U^2 )$

$V^2 - U^2 = 2gh$

$V^2 - 0 = 2gh$

$V = \sqrt{2 g h}$

$= \sqrt{2\times9.8\times11}$

= 14.68m/s

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3 years ago

Galileo discovered that which planet undergoes phases as viewed from earth?

balu736 [363]

<h2>Answer: Venus</h2>

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In the case of Venus, he observed that it presented phases (such as those of the moon) together with a variation in size; observations that are only compatible with the fact that Venus rotates around the Sun and not around Earth.

This is because Venus presented its smaller size when it is in full phase and the largest size when it is in the new one, when it is between the Sun and the Earth.

These images along with other discoveries were presented to the Catholic Church (which supported the geocentric theory for that time) as a proof that completely refutes Ptolemy's geocentric system and affirms Copernicus' heliocentric theory.

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Marina86 [1]

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What is the half-life of a radioisotope

nadezda [96]

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3 years ago

Read 2 more answers

point) A tank in the shape of an inverted right circular cone has height 5 meters and radius 4 meters. It is filled with 4 meter

zysi [14]

Answer:

W = 907963.50 J = 907.96 J

Explanation:

Note: Refer to the figure attached

Now, from the figure we have similar triangles ΔAOB and ΔCOD

we have

$\frac{5}{4}=\frac{x}{r}$