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IceJOKER [234]
3 years ago
6

A 1-pound ball and a 100-pound ball are dropped from a height of 10 feet at the same time. in the absence of air resistance, ___

_______.
Physics
2 answers:
Elena L [17]3 years ago
7 0
The 100 ball would fall faster
professor190 [17]3 years ago
6 0

Answer:

They both will reach the ground at the same time. it will be a tie

Explanation:

Given

m_1 = 1 lb\\\\m_2 = 100 lb\\\\height,h = 10 ft\\\\

Known

acceleration due to gravity,g = 32.2 ft/s^2\\

Solution

Since the balls are dropped freely, their inital velocity u is zero.

let us find the final velocity of 1 pound ball

v^2=-u^2 + 2gh\\\\v^2 = 0^2 + 2 \times 32.2 \times 10\\\\v^2 = 196\\\\v = 25.4 ft/s

Note that in the equation is v^2=-u^2 + 2gh the mass of the object has no place. So, The final velocity is independent of the mass

so the final velocity of the 100 pound ball will also be 25.4 ft/s

Now let us find the time taken for the 1 pound ball

v = u + gt\\\\25.4 = 0+ 32.2t\\\\t = 0.788s

Since the equation v = u + gt does not depend on mass, the 100 pound ball will also reach the ground at time t = 0.788 s

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Black widow (m=57000 g) shovels snow, holding the shovel at a 40 degree angle above the ground. If she uses a constant force of
Dima020 [189]

Answer:

She does a work of 689.44 J in the snow.

Explanation:

A force is said to do work when it alters the state of motion of a body. The work of the force on that body will be equivalent to the energy needed to move it.

In other words, Work is a form of energy transmission between bodies. In order to carry out work, a force must be exerted on a body and it must move.

The work is equal to the product of the force times the distance and the cosine of the angle that exists between the direction of the force and the direction that the moving point or object travels:

W= F*d* cos Ф

Work W is measured in joules (J), force is measured in newtons (N), and displacement in meters (m).

In this case:

  • F= 180 N
  • d=5 m
  • Ф= 40 degrees

Replacing:

W= 180 N*5 m* cos 40

Solving:

W= 689.44 J

<u><em>She does a work of 689.44 J in the snow.</em></u>

7 0
3 years ago
Where is Jesus located, I would like to pay him a visit ;)
Marina86 [1]

Answer:

Jesus is in everyone's heart...

Just try to find him..:D

5 0
3 years ago
A monk is sitting atop a mountain in complete rest in meditation. What is the kinetic Energy of the monk? (assume mass of 65 kg
Genrish500 [490]

Answer:

no kinetic energy

hope this helps! :-D

Explanation:

the monk is not moving

7 0
3 years ago
A jogger runs 300 meters due east and then turns and runs 500 meters due west.
valentina_108 [34]
It’ll be 200 meters West because 500-300=200 and The west direction has the greatest force you could say ... Anytime you have a question asking about displacement you subtract then use the direction with the greatest number ..
3 0
3 years ago
In loading a lorry, a man lifts boxes each of weight 100N through a height of 1.5m.
liq [111]

Answer:

The amount of work done in order to lift the box is 150\ Joule

Explanation:

Given the weight of each box is 100N

And the man lifts boxes at a height of 1.5m

We need to find the amount of work done.

The amount of work done is the product of applied force F that causes the displacement d.

In our problem force is 100N and displacement is  1.5m.

Now, work done

=force\times displacement\\=100\times1.5\\=150\ Joule

So, the amount of work done in order to lift the box is 150\ Joule

5 0
3 years ago
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