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
givi [52]
3 years ago
12

A 180 lb crate is on the ground, and a strong rope is attached. You need to move it across the basement floor, which has a coeff

icient of friction of 0.7 against the wood of the crate. To avoid actually working you call your friend to complain that you have to push it so hard. Your friend says you should pull it with the rope (your height will cause it to have a 60° angle to horizontal), since it will lower the weight and therefore the friction force. You counter (still avoiding work) that you will also have less force on the crate so it cancels out. What is the right answer? Is it better to pull with the rope or push? Why?
Physics
1 answer:
jekas [21]3 years ago
6 0

Answer:

F = 505.13 N

Yes it is better to pull the rope rather than push it

Explanation:

Let the force is applied at an angle of 60 degree

so we will have net vertical force on the crate is given as

F_n + Fsin60 = mg

here we know

m = 180 lb

m = 81.65 kg

F_n = 81.65(9.81) - Fsin60

F_n = 801 - 0.866 F

now friction force on the crate is given as

F_x = \mu F_n

Fcos60 = 0.7(801 - 0.866 F)

0.5F + 0.61F = 560.7

F = 505.13 N

Yes it is better to pull the rope rather than push it

You might be interested in
A blank tells you what the different symbols and lines represent on a map
Oduvanchick [21]

A legend on a map tells you what different symbols mean

3 0
3 years ago
What is life gsjkdgkkceskjhvcskgjeghsvcjev
egoroff_w [7]

Answer:

Its so yours

Explanation:

7 0
3 years ago
How do you know the earth is rotating on its axis
cupoosta [38]

Answer:

Read below!

Explanation:

You can watch the sun wheel across the sky during the day, and the stars at night. Focus a telescope on any star besides the north star--especially southern stars--and you can watch them drift across your field of view.  

An alternative explanation is that all the stars are painted on (or holes in) some canopy that rotates around the earth. This explanation does not account for the motion of the "wanderers," or planets, as the Greeks called them, or for the path of the moon among the stars.  

As we know the stars are massive bodies of significant and varying distance to the earth, the notion they all swing around us in unison seems highly implausible

4 0
3 years ago
Can someone explain it with steps?
Anton [14]

Answer:

Option C is the correct answer

Explanation:

Distance travelled by car during reaction time

=15\times0.4\\\\=6m

The car stopped before hitting the animal by 1 m

Distance travelled during deceleration is 21-6-1=14m

Hence by v^2=u^2+2as

We have

0^2=15^2+2 \cdot a \cdot 14\\\\a=\frac{-225}{28} \\\\=-8.03m/s^2

Option C is the correct answer

5 0
2 years ago
Read 2 more answers
write an essay describing and predicting the effects of fitness-related stress management techniques on the body.
Tatiana [17]
This is something u are going to have to do
7 0
3 years ago
Other questions:
  • Soon after Earth was formed, heat released by the decay of radioactive elements raised the average internal temperature from 300
    7·1 answer
  • What best describes a possible transfer of energy? A mechanical wave transfers energy through matter. A longitudinal wave transf
    14·2 answers
  • This question that it pictured
    10·1 answer
  • Introductory Astronomy1. Light is absorbed and emitted in the form ofwhich are "packets" ofelectromagnetic radiation that carry
    7·1 answer
  • Jade and her roommate Jari commute to work each morning, traveling west on I-10. One morning Jade left for work at 6:45 A.M., bu
    15·1 answer
  • Walking converts what type of energy into mechanical energy?
    15·2 answers
  • What effect does a surfactant have on the surface tension of water
    11·1 answer
  • Determine how dollar bills, placed end to end, are required to go around Earth at the equator. You will need to measure the leng
    14·1 answer
  • Look at photo D. Explain how the fountains help to keep the gardens cool. ​
    13·1 answer
  • What are two ways to advance basketball down the Court​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!