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
NemiM [27]
3 years ago
15

A factory worker pushes a 30.0-kg crate a distance of 4.5 m along a level floor at constant velocity by pushing horizontally on

it. the coefficient of kinetic friction between the crate and the floor is 0.25. (a) what magnitude of force must the worker apply
Physics
1 answer:
Olin [163]3 years ago
5 0
The crate moves at constant velocity, this means that its acceleration is zero, so the net force acting on the crate is zero (Newton's second law). 

There are only two forces acting on the crate: the force F applied by the worker and the frictional force, acting in the opposite direction: \mu m g, where \mu=0.25 is the coefficient of friction and m=30.0 kg is the mass of the crate. Since the net force should be equal to zero, the two forces must have same magnitude, so we have:
F=\mu m g=(0.25)(30.0 kg)(9.81 m/s^2)=73.8 N
And so, this is the force that the worker must apply to the crate.
You might be interested in
Movement of a rocket​
makkiz [27]

Answer:

as the fuel burns,games push against the rocket moving it upward

8 0
3 years ago
Read 2 more answers
What r semiconductors?
KengaRu [80]
It is a solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects
5 0
3 years ago
Objects in free fall are weightless. true or false???
frez [133]

The answer is false

7 0
3 years ago
A small block with mass 0.0400 kg is moving in the xy-plane. The net force on the block is described by the potentialenergy func
OlgaM077 [116]

Answer:

A= 148.92  m/s²

Explanation:

Given that

U(x,y) = (6.00  )x²  - (3.75  )y ³

m= 0.04 kg

Now force in the x-direction

Fx= - dU/dx

U(x,y) = (6.00  )x²  - (3.75  )y ³

dU/dx= 12 x

When x=0.4 m

dU/dx= 12 x 0.4 = 4.8

So we can say that

Fx= - 4.8 N

From Newtons law

F= m a

- 4.8 = 0.04 x a

a = -120 m/s²

Acceleration in x direction ,a = -120 m/s²

In y -direction

F= - dU/dy

U(x,y) = (6.00  )x²  - (3.75  )y ³

dU/dy = 0 - 3.75 x 3 y²

When y = 0.56 m

dU/dy = - 3.75 x 3 x 0.56 x 0.56

dU/dy = - 3.52

So we can say that force in y -direction

F= 3.52 N

F= m a'

3.52 = 0.04 x a'

a'=88.2 m/s²

acceleration in y direction is 88.2 m/s²

The resultant acceleration

A=\sqrt{a^2+a'^2}

A=\sqrt{120^2+88.2^2}

A= 148.92  m/s²

7 0
3 years ago
In what direction would the particles in this wave move, relative to the direction of wave travel?
Setler79 [48]
Everywhere particles dont stay in one place they move elsewhere
7 0
3 years ago
Read 2 more answers
Other questions:
  • What do you spiral and elliptical galaxies have in common
    12·1 answer
  • WILL MARK BRAINLIEST!
    12·1 answer
  • How much min the basketball 1 player play​
    11·1 answer
  • A thin, 75.0 cm wire has a mass of 16.5 g. One end is tied to a nail, and the other is attached to a screw that can be adjusted
    7·1 answer
  • Objects 1 and 2 attract each other with a electrostatic force
    15·2 answers
  • How are scientists able to measure the age of earth?
    9·1 answer
  • g A simply supported beam is subjected to a distribution of force per length given by the polynomial form: q(x)=Axn . Calculate
    10·1 answer
  • A 2.0 cm thick brass plate (k_r = 105 W/K-m) is sealed to a glass sheet (kg = 0.80 W/K m), and both have the same area. The expo
    11·1 answer
  • WILL GIVE BRAINLIEST!!!
    5·1 answer
  • To lower the risk of a collision, you should keep at least __________ of space to one side of your vehicle at all times.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!