Physics, 07.11.2019 21:31 Jessieeeeey

Marissa does 3.2 j of work to lower the window shade in her bedroom a distance of
0.80 m. how much force must marissa exert on the window shade?

Answers: 3

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Answer from: rhucke99121

Considering the definition of work, Marissa must exert a force of 4 N on the window shade.

Work is defined as the force that is applied on a body to move it from one point to another. When a force is applied, an energy transfer occurs. Then it can be said that work is energy in motion.

When a net force is applied to the body or a system and this produces displacement, then that force is said to perform mechanical work. This work can be positive if the system gains energy or negative if the system loses energy.

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

Work= Force× distance× cos (angle)

In this case, the angle between the force and the displacement is 0 degrees. This is due to the force and the displacement have the same direction and sense, in the horizontal direction. So the cosine of 0 degrees will have a value of 1. Then, the work is calculated as:

Work= Force× distance× 1

Work=Force× distance

On the other side, you know:

Work= 3.2 JDistance=0.80 m

Replacing in the definition of work:

3.2 J= Force× 0.8 m

Solving:

3.2 J÷ 0.8 m= Force

4 N= Force

In summary, Marissa must exert a force of 4 N on the window shade.

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Answer from: bnnn

4.0 N

Explanation:

Work = force × distance

3.2 J = F × 0.80 m

F = 4.0 N

Answer from: Quest

Iwould sure like to answer your question but i honestly just don’t know

Answer from: Quest

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6 $\frac{m}{s^{2} }$

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

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Marissa does 3.2 j of work to lower the window shade in her bedroom a distance of
0.80 m. how...