If a small machine does 2,500 joules of work on an object to move it a distance of 100 meters in 10 seconds,what is the force needed to do the work? What is the power of the machine doing the work?

Answers

Answer 1

Answer:

The force needed to do the work is equal to 25 N. The power of the machine doing the work is equal to 250 W.

What is power?

The power can be explained as the speed of doing work or work done in unit time. The SI unit of measurement of power joules per second (J/s) Watt (W).

Power can be defined as a time-based parameter and the change at work is done upon an object. The mathematical formula for power can be represented as mentioned below.

Power = Work/ time

P = W/t

Given, the work done by the machine, W = 2500 J

The distance moved by the object, d - 100 m

The work done can be represented in the form of the equation:
W = F.d

2500 = F.100

F = 25 N

The power of the machine doing the work, P = W/t

P = 2500 / 10

P = 250 W

Therefore, the force required to do the work is equal to 25 N. The power of the small machine doing the work is equal to 250 W.

Learn more about power, here:

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Answer 2

Answer: Well, 2500 joules for 100 meters is 2500/100=25 Newtons (force)
2500 joules in 10 seconds is a power of 250 Watts.

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Fill in the blank with the correct response.Employing the use of a(n)
will help you manage a STEM project.

Answers

Answer:

technicians

Explanation:

What would be the result of an alpha particle coming into a magnetic field?A) The alpha particle will stop moving.
B) The alpha particle will reverse its direction.
C) The alpha particle will be deflected in a curve path.
Eliminate
D) The alpha particle will continue to travel in a straight line.

Answers

Answer:

C. The alpha particle will be deflected in a curve path.

Alpha particles are nuclei of helium and consist of two neutrons and two protons. So, they are positively charged.

Then the alpha particle will be deflected by a magnetic field.

Milwaukee is 121 mi (air miles) due west of Grand Rapids. Maria drives 255 mi in 4.75 h from Grand Rapids to Milwaukee around Lake Michigan. Find: a. Her average driving speed
b. Her average travel velocity

Answers

a).
Average speed = (distance driven) / (time to drive the distance)

   = (255 miles) / (4.75 hours)

   = (255/4.75) (mile/hour) = 53.7 miles per hour .

b).
Average velocity =

   (displacement) / (time for the trip)

   = (distance and direction from
       start-point to end-point,
   regardless of the route)    /    (time for the trip)

   = (121 miles west) / (4.75 hours)

   = (121 / 4.75) (miles per hour west)

   = 25.5 miles per hour west .

You step into an elevator on the 50th floor and it quickly accelerates downward. For a second, until steady speed is reached, __________. A.) your weight is unchanged but your mass decreases B.) your mass is unchanged but your weight decreases C.) neither your mass nor weight change but the gravitational force decreases D.) neither your mass nor weight change but your apparent weight decreases

Answers

Answer:

Mass and weight would stay the same. However, the normal force between the person and the ground becomes smaller, making the weight of the person appear smaller.

Explanation:

The mass of an object is an intrinsic property. The mass of the object stays the same regardless of the motion of the object or the forces acting on the object. As a result, when the elevator accelerates downwards, the mass of this person would stay the same.

The weight of an object refers to the gravitational force on this object.

The gravitational force on an object is the product of the mass $m$ and the strength $g$ of the gravitational field:

$(\text{weight}) = m\, g$ .

The gravitational field strength near the surface of the Earth is mostly uniform ( $g \approx 9.81\; {\rm N\cdot kg^(-1)}$ .) Since the mass of this person stays the same, the weight of this person would also stay the same.

When a person stands on level ground, forces on this person would include:

Weight, which points downward, and
Normal force from the ground, which points upward.

The net force on this person would be:

$(\text{net force}) = (\text{weight}) + (\text{normal force})$ .

Rearrange this equation to obtain an expression for normal force:

$(\text{normal force}) = (-(\text{weight})) + (\text{net force})$ .

When the person is not moving, acceleration of the person would be zero. By Newton's Laws of Motion, the net force on this person would also be zero.

In the equation above, the magnitude of the normal force would be equal to the magnitude of weight. It would appear that the normal force on the person is equal in magnitude to the weight of this person.

However, when the person accelerates in the vertical direction, the net force on the person will become non-zero in the vertical direction. Normal force would no longer be equal in magnitude to weight.

Specifically, when the person accelerates downward in this elevator, acceleration of this person would point downward. Net force on this person would also point downward.

In the equation $(\text{normal force}) = (-(\text{weight})) + (\text{net force})$ , $(\text{weight})$ also points downward. However, because of the negative sign $(-(\text{weight}))$ and $(\text{net force})$ would be in opposite directions.

Additionally, the magnitude of net force cannot exceed the magnitude of weight. As a result, the magnitude of the sum of these two vectors would be smaller than the magnitude of weight.

The normal force on this object is equal to the sum of these two vectors. As a result, the magnitude of normal force would also be smaller than the magnitude when the person isn't moving. It would appear as if the apparent weight of this person has become smaller than the original value.

Which method of calculating volume would you use if the object is irregulary shaped?

Answers

Use a graduated cylinder filled halfway with water. Place the object inside, and measure the difference of the water level before and after you put said object in the water.

...Also this is elementary/middle school science

An apple weighs at 1N. the net force on the apple when it is in free fall is?a. 0N
b. 0.1N
c. 1N
d. 10N
e. none of the above

Answers

The weight is the magnitude of the gravitational force between
the Earth and the apple. There's no reason for the force to change
just because the apple happens to be in motion. If it weighs 1N on
the scale, then it weighs 1N while it's sailing over the fence, 1N on
the teacher's desk, and 1N while it's falling from the tree.

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