Find the force, in N that does 0.0284 kilojoules of work in moving a book a distance of 4.00 meters

Answers

Answer 1

Answer: Work equals force timesdistance. When you move an object, you are exerting a force onto it. Byexerting a force on the object, you are actually displacing it from its initialposition. You cannot apply force to the object without altering its position. Keepin mind that when you exert work, you are exerting energy too. Note that 1kilojoule = 1000 joules and joules is equal to Newton meter. So,

W = F*d
F = W/d
F = (0.0284 kJ)(1000J/1kJ)(1N-m/1J)/4m
F = 7.1 N

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In which of the following situations would the least work have been done?A. A 100-N force lifts an object 3 m.
B. A 250-N force moves an object 1 m.
C. A 25-N force moves an object 8 m.
D. A 600-N force is applied to an object and moves it 0 m.

Answers

Work = (magnitude of the force) x (distance in the direction of the force)

A 100-N force lifts an object 3 m. ==> (100 x 3) = 300 joules

B. A 250-N force moves an object 1 m. ==> (250 x 1) = 250 joules

C. A 25-N force moves an object 8 m. ==> (25 x 8) = 200 joules

D. A 600-N force is applied to an object
and moves it 0 m. ==> (600 x 0) = no work
Winner ! Least work.

Which of the following is NOT a skill scientists use to learn about the world?

Answers

There are many skills that scientists don't use to learn about the world.
These skills include playing the harmonica, riding a unicycle, and asking
others to choose from a list and then not telling them what's on the list.

Any formation in which groundwater Rises on its own under pressure is a

Answers

The answer is an artesian well. Any formation in which groundwater rises on its own under pressure is an artesian well. An artesian well is simply a well that doesn't require any effort to pump the water up to the surface in which this occur when there's enough pressure in the aquifer.

A 60 kg student is standing atop a spring in an elevator that is accelerating upward at 3.0 m/s2. The spring constant is 2.5 x 103 N/m. By how much is the spring compressed?

Answers

the spring will be compressed by 0.3072 m

Explanation:

acceleration of elevator=3 m/s²

mass of student= 60 Kg

spring constant=2.5 x 10³ N/m

the force on the student is given by F = m ( g +a)

F=60 (9.8+3)

F=768 N

now the formula for spring force is given by

F= k x

768= 2.5 x 10³ (x)

x=0.3072 m

Final answer:

The spring on which a 60kg student is standing in an elevator accelerating at 3.0 m/s² is compressed by approximately 30.72 cm. This is calculated using Hooke's Law, considering both the weight of the student and the additional force due to the elevator's acceleration.

Explanation:

The situation you've described involves Hooke's Law, which states that the force needed to extend or compress a spring by some distance is proportional to that distance. In this case, we can consider the student's weight plus the extra force from the acceleration of the elevator.

To determine the compression of the spring, we use the equation F = kx, where F is the total force exerted on the spring, k is the spring constant, and x is the amount the spring is compressed. Here, the total force (F) includes the weight of the student and the force due to the elevator's acceleration. So, F = mg + ma, where m is the mass of the student, g is the gravity (9.8 m/s²), and a is the acceleration of the elevator.

Substituting the given values, we get F = (60 kg)(9.8 m/s²) + (60 kg)(3.0 m/s²) = 768 N. The compression of the spring (x) is now obtained by rearranging the Hooke's law formula to x = F/k.

This results in x = 768 N ÷ 2.5 x 10³ N/m = 0.3072 m or 30.72 cm. Thus, the spring is compressed by approximately 30.72 cm due to the combined force of the student's weight and the accelerating elevator.

Learn more about Hooke's Law here:

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The two factors that determine velocity are....A: speed and direction
B: direction and distance
C: position and rate
D: distance and mass

please help which one are these . for science class

Answers

Answer:

Explanation:

D Distance and Mass

The law of suggests that the orbit of planets is not circular but .

Answers

Answer:

Kepler's first law suggests that the orbit of planets is not circular but elliptical

Explanation:

The three Kepler's laws explain the motion of the planets orbiting the Sun:

- The first law tells that the orbits of the planets around the Sun are ellipses, with the Sun located at one of the two focii

- The second law tells that a line connecting the Sun with the planet sweeps out equal areas in equal amounts of time

- The third law tells that the square of the orbital periods of the planets is proportional to the cube of their average distance from the Sun

As we can read, the first law tells us that the orbit of the planets is not circular, but elliptical.

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