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2 years ago

Sarah weighs 392 N. She pushes a 56 kg rock with a force of 65 N. What force does the rock exert on Sarah?

Physics

1 answer:

Leona [35]2 years ago

6 0

Answer:

The force the rock exerts on Sarah =#is 65 N

Explanation:

The given parameters are;

Sarah's weight = 392 N

The force with which Sarah pushes the rock = 65 N

The mass of the rock = 56 kg

The weight of the rock = The mass of the rock × Acceleration due to gravity

∴ The weight of the rock = 56 kg ×9.81 m/s² = 549.36 N

Given that the force Sarah applies to push the rock = 65 N, then by Newton's third law of motion which states that action and reaction are equal and opposite, the force that the rock exert on Sarah is equal an opposite to the force Sarah is applying

Therefore, the force the rock exerts on Sarah = 65 N (in the opposite direction).

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tekilochka [14]

4000 seconds

Explanation:

speed = distance / time

0.0004m/s = 1.6m / time

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time = 1.6 / 0.0004

time = 4000 seconds.

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2 years ago

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3 years ago

A horizontal spring is lying on a frictionless surface. One end of the spring is attached to a wall, and the other end is connec

Wewaii [24]

Answer:

Velocity = 0.4762 m/s

Explanation:

Given the details for the simple harmonic motion from the question as:

Angular frequency, ω = 12 rad/s

Amplitude, A = 0.060 m

Displacement, y = 0.045 m

The initial Energy = U = (1/2) kA²

where A is the amplitude and k is the spring constant.

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K + U = (1/2) mv² + (1/2) kx²

where x is the displacement

m is the mass of the object

v is the speed of the object

Since energy is conservative. So, the final and initial energies are equal as:

(1/2) k A² = (1/2) m v² + (1/2) kx²

Using, ω² = k/m, we get:

Velocity:

$v=\omega\times \sqrt{[ A^2 - y^2 ]}$

$v=\omega\times \sqrt{[ {0.06}^2 - {0.045}^2 ]}$

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2 years ago

What’s a substance made up of two or more elements

Alex

Answer:

That would be a molecule. : )

Explanation:

The definition of a molecule is a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

7 0

2 years ago

A block with an initial kinetic energy of 4.0 J comes to rest after sliding 1.0 m. How far would the block slide if it had 8.0 J

Anna007 [38]

Answer:

2.0 m

Explanation:

Kinetic Energy: This is the energy of a body due to motion.

According to the law of conservation of energy,

Kinetic Energy = potential Energy = mgs

Where m = mass (kg) , g = acceleration due to gravity (m/s²) , s = distance or height (m).

Kinetic energy = 4.0 J , s = 1.0 m , g= 9.8m/s² , m=?

∴ m = kinetic Energy/(gs)

m = 4/(1 ×9.8) = 0.4081 Kg.

When the initial kinetic energy 8.0 J

∴ Distance (s) = 8.0/(0.4081 × 9.8)

Distance (s) = 2.00031

Distance (s) ≈ 2.0 m

∴ the block would slide 2.0 m

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3 years ago