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abruzzese [7]
3 years ago
13

7) HELP ASAP PLZ PLZ HELP ME I don't know if I am right so if I am not right can you plz help me

Physics
2 answers:
artcher [175]3 years ago
6 0
It’s either “B” or “A”
CaHeK987 [17]3 years ago
5 0
I believe that the answer is B
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How much work is done if you push a 200 N box across a floor with a force of 50 N for a distance of 20m
vovikov84 [41]
<h2>Answer: 1000 J</h2>

The Work W done by a Force F refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path.  

It should be noted that it is a scalar magnitude, and its unit in the International System of Units is the Joule (like energy). Therefore, 1 Joule is the work done by a force of 1 Newton when moving an object, in the direction of the force, along 1 meter:  

1J=(1N)(1m)=Nm  

Now, when the applied force is constant and the direction of the force and the direction of the movement are parallel, the equation to calculate it is:  

W=(F)(d) (1)

When they are not parallel, both directions form an angle, let's call it \alpha. In that case the expression to calculate the Work is:  

W=Fdcos{\alpha} (2)

For example, in order to push the 200 N box across the floor, you have to apply a force along the distance d to overcome the resistance of the weight of the box (its 200 N).  

In this case both <u>(the force and the distance in the path) are parallel</u>, so the work W performed is the product of the force exerted to push the box F=50N by the distance traveled d. as shown in equation (1).

Hence:

W=(50N)(20m)  

W=1000Nm=1000J >>>>This is the work  

8 0
3 years ago
What statement best describes the superposition principle (Physics)
Alexandra [31]

Answer:

The principle of superposition which is also called superposition property,states that when two or more waves of the same type cross at some point, the resultant displacement at that point is equal to the sum of the displacements due to each individual wave.

Explanation:

5 0
3 years ago
If the pressure of a gas is increased, then the volume will decre
pogonyaev

Answer:

The answer is b

Explanation:

8 0
3 years ago
A seashell is suspended in the air at rest by two strands of spider silk. Each strand of silk makes an angle of 75 degrees above
Ksenya-84 [330]

The mass of the seashell suspended by the two strands of spider silk is 0.28 kg.

The given parameters:

  • <em>Tension on each strand of silk, T = 1.42 N</em>
  • <em>Angle of inclination of each strand, θ = 75⁰</em>

The mass of the seashell at equilibrium is calculated by applying Newton's second law of motion;

\Sigma F = 0\\\\T_1 sin(\theta) + T_2 sin(\theta) - W = 0

where;

  • W is the weight of the seashell

The weight of the seashell is calculated as;

1.42 \times sin(75) \ + \ 1.42 \times sin(75) \ - W = 0\\\\2.743 - W = 0\\\\W = 2.743 \ N

The mass of the seashell is calculated as follows;

W = mg\\\\m = \frac{W}{g} \\\\m = \frac{2.743}{9.8} \\\\m = 0.28 \ kg

Thus, the mass of the seashell suspended by the two strands of spider silk is 0.28 kg.

Learn more about equilibrium forces here: brainly.com/question/8045102

5 0
3 years ago
An assistant for a football team carries a 26.0 kg cooler of water from the top row of the stadium, which is a distance h = 17.5
frozen [14]

The weight of the cooler is (mg). That's (26)(9.8) = 254.8 Newtons.

Its gravitational potential energy while it's up in the top row is (mgh). That's (254.8)(17.5) = 4,459 Joules.

That's how much work it took to get the cooler up to the top row, and that's the energy it gives up when it moves back down to the bench.

In order to bring it down . . .

-- Gravity does 4,459 joules of work on the cooler.

-- The team assistant does NEGATIVE 4,459 joules of work on it.

6 0
3 years ago
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