Which protects a cell and forms it’s boundary

Physics

1 answer:

ivann1987 [24]3 years ago

5 0

Answer:

For a plant cell: The cell wall and the cell membrane

For animal cells: Just the cell membrane

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Which of these statements about neutrons is true? . . . A.. Neutrons travel around the nucleus of an atom.. . . B.. A neutron ha

Bas_tet [7]

B is the correct answer. Neutrons have no charge. In contrast, protons are positively charged and electrons have negative charge. These charges are all relative to each other. The protons and neutrons can be found inside the atom of an element. Electrons float around the outside.

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3 years ago

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1. What is work done in holding a 15kg suitcase while waiting for a bus for 15 minutes?

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The man is holding the suitcase at the same height above the surface of earth. So the gravitation potential energy remains the same.

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a 200 kg crate is pushed horizontally with a force of 700 N. If the coefficient of friction is 0.2 calculate the acceleration of

Crazy boy [7]

Answer:

$a=1.54\ m/s^2$

Explanation:

Net Force

The Second Newton's law states that an object acquires acceleration when an external unbalanced net force is applied to it.

That acceleration is proportional to the net force and inversely proportional to the mass of the object.

It can be expressed with the formula:

$\displaystyle a=\frac{F_n}{m}$

Where

Fn = Net force

m = mass

The m=200 kg crate is pushed horizontally with a force Fa=700 N. The friction force opposes motion and a horizontal net force appears causing the acceleration.

The forces on the vertical direction are in balance since the crate does not accelerate in that direction, thus the weight and the normal force are equal:

N = W = mg

The friction force can be calculated by using the coefficient of friction μ:

$F_r=\mu N$