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
solniwko [45]
3 years ago
11

A 30.0 kg packing crate in a warehouse is pushed to the loading dock by a worker who applies a horizontal force. The coefficient

of kinetic friction between the crate and the floor is 0.20. The loading dock is 15.0 m southwest of the initial position of the crate. (a) If the crate is pushed 10.6 m south and then 10.6 m west, what is the total work done on the crate by friction? (b) If the crate is pushed along a straight-line path to the dock, so that it travels 15.0 m southwest, what is the work done on the crate by friction?
Physics
1 answer:
Sergio [31]3 years ago
6 0

Answer:

a) 1272J

b) 900J

Explanation:

In order to calculate work, we need the magnitude of the friction and the distance the crate moved. For part a) the distance is the sum of 10.6m + 10.6m and for part b) it is 15m. So now we just need the magnitude of the friction.

We know that Fr = μ*N  where N = m*g, so:

Fr = μ * m * g    Replacing the values, we get Fr = 0.2*30*10 = 60N

With this magnitude we can now calculate the work:

W1 = Fr * d1 + Fr * d2 = 60*10.6 + 60*10.6 = 636J + 636J = 1272 J

And now through the straight line:

W2 = Fr * d = 900J

You might be interested in
Josh has a toy car of mass 3 kg tied to a string of length 2 m. He ties the string to a pole and has the toy car drive in a circ
gulaghasi [49]

Part a)

Centripetal acceleration is defined as

a_c = \frac{v^2}{R}

now here we know that

v = 3m/s

R = 2 m

m = 3 kg

now from above formula we have

a_c = \frac{3^2}{2}

a_c = 4.5 m/s^2

Part b)

Maximum possible tension in the string is given as

T = 50 N

now by force equation we have

F = ma

50 = 3 a

a = \frac{50}{3} m/s^2

now again by above formula

\frac{v^2}{R} = \frac{50}{3}

v = \sqrt{\frac{50 \times 2}{3}}

v = 5.77 m/s

5 0
3 years ago
Read 2 more answers
What are the two distinct ways in which energy moves outward from the solar core to photosphere?
butalik [34]

Answer:

The energy may be carried in the form of (1) radiation, where energy travels in the form of light, and (2) convection, where energy is carried by physical motion of upwelling solar gas.

Explanation:

6 0
3 years ago
The discharge of a stream is Choose one: likely to decrease downstream in arid regions and increase downstream in temperate regi
Sauron [17]

Answer:

<em>likely to decrease downstream in arid regions and increase downstream in temperate regions</em>

<em></em>

Explanation:

Arid regions are is a region with a severe lack of water, usually to the extent that affect the organisms living in the region. Arid regions are characterized by a very low depth of rainfall per year. Temperate region on the other hand experience more distinct seasonal change and wider temperature change. Temperate regions get a fairly large amount of rainfall per year.

In arid regions, the soil is very dry, and the rate of infiltration and percolation is high relative to the amount of rainfall available. The effect is that more water is infiltrated into the soil as you move downstream, leading to a decrease in the discharge of a stream as you move downstream. Most temperate region have soils that are usually saturated in the peak of the rainfall season, leading to a greater stream discharge as you move downstream.  

3 0
3 years ago
PLEASE HELP ASAP!!!!!!!!!!!!
lianna [129]

The first choice on the list is the correct one.

7 0
3 years ago
Why won’t a magnet help you separate a mixture of salt and water
Gennadij [26K]

Answer: nor are magnetic

5 0
3 years ago
Read 2 more answers
Other questions:
  • For an object moving in a circular path,which quantity is always changing?<br>​
    8·1 answer
  • Which of these statements are true?
    11·2 answers
  • In an electromagnetic wave in free space, the ratio of the magnitudes of electric and magnetic field vectors E and B is equal:__
    11·1 answer
  • Why do we have seasons on Earth
    8·2 answers
  • Can someone help me?!!!!!
    7·1 answer
  • Constants Canada geese migrate essentially along a north-south direction for well over a thousand kilometers in some cases, trav
    10·1 answer
  • A student forgets to turn off a 6.00x 10² W block heater of a car when the weather turns warm. If 14 h goes by before he shuts i
    15·1 answer
  • What is Newton's 3rd law of motion?
    10·1 answer
  • According to Newton's 3rd Law of Motion, Doug, a baseball
    10·1 answer
  • Which of the following describes an electric current?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!