1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
velikii [3]
3 years ago
11

A 1300-N crate rests on the floor. How much work is required to move it at constant speed (a)

Physics
1 answer:
kherson [118]3 years ago
4 0

a) The work done is 920 J

b) The work done is 5200 J

Explanation:

a)

In this first part of the problem, the crate is moved horizontally at constant speed.

The work required in this case is given by

W=Fd cos \theta

where

F is the magnitude of the force applied

d is the displacement of the crate

\theta is the angle between the direction of the force and of the displacement

Here the crate is moved at constant speed: this means that the acceleration of the crate is zero, and so according to Newton's second law, the net force on the crate is zero: this means that the force applied, F, must be equal to the force of friction (but in opposite direction), so

F = 230 N

The displacement is

d = 4.0 m

And the angle is \theta=0^{\circ}, since the force is applied horizontally. Therefore, the work done is

W=(230)(4.0)(cos 0^{\circ})=920 J

b)

In this case, the crate is moved vertically. The force that must be applied to lift the crate must be equal to the weight of the crate (in order to move it a constant speed), therefore

F = W = 1300 N

The displacement this time is again

d = 4.0 m

And the angle is \theta=0^{\circ}, since the force is applied vertically, and the crate is moved also vertically. Therefore, the work done on the crate this time is

W=(1300)(4.0)(cos 0^{\circ})=5200 J

Learn more about work:

brainly.com/question/6763771

brainly.com/question/6443626

#LearnwithBrainly

You might be interested in
I'm bored. ........................
NeX [460]

Answer:

Explanation:

hi

8 0
2 years ago
Read 2 more answers
A small rubber ball is thrown at a heavier, larger basketball that is still. The small ball bounces off the basketball. Assume t
meriva
Part A.
The forces are the same because the force from the smaller ball it transferring its Energy through the basketball and it's rebounding as Connecticut Energy back up to the smaller ball
6 0
2 years ago
Read 2 more answers
so classmate states that continental drift could not be possible because it would take far too much force to move tectonic plate
Juliette [100K]
Any student who states that tectonic plates are too massive to move doesn't understand how much heat exists in the center of the earth. This heat is capable of moving the most massive of plates.
5 0
3 years ago
While studying bacterial cells, scientists measure the lengths of the cells in one colony. The chart shows their data. The scien
jok3333 [9.3K]

Answer:

Following are the solution to the given question:

Explanation:

Its best approach to this measurement ought to be to indicate that there was a mistake throughout the calculation, as well as the gathering of further details while researching cells for bacteria, directly measuring the cell length of a colony. This chart illustrates its data, which scientists have observed that there's still a measurement.

5 0
2 years ago
When a chemical reaction occurs,
mel-nik [20]
A) reactants interact to form products with different chemical and physical properties
3 0
2 years ago
Other questions:
  • An iron ball and an aluminum ball of mass 100 g each are heated to the same temperature and then cooled to a temperature of 20°C
    8·1 answer
  • It is always a good idea to get some sense of the "size" of units. For example, the mass of an apple is about 100 g , whereas a
    6·1 answer
  • The velocity of a wave is the product of the frequency and the
    13·2 answers
  • A stone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. The stone rolls down 10 meters an
    11·2 answers
  • Charge q is 1 unit of distance away from the source charge S. Charge p is two times further away. The force exerted between S an
    8·2 answers
  • What . Slides are placed upside down in a slide projector to correct for the _______ image produced. A. magnified B. inverted C.
    9·2 answers
  • A dielectric material is inserted between the charged plates of a parallel-plate capacitor. Do the following quantities increase
    12·2 answers
  • When melted does the size of butter change
    10·2 answers
  • What happens to your kinectic energy when your gravitational potential energy decreases?
    10·1 answer
  • How net current on a toroid is zero?​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!