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
goldenfox [79]
4 years ago
12

How long will it take a 400 W engine to lift a 100 N object up to a height of 80 m?

Physics
2 answers:
Norma-Jean [14]4 years ago
4 0
<h3>Answer:</h3>

20 seconds

<h3>Explanation:</h3>

<u>We are given</u>;

  • Power of the engine as 400 watts
  • Force as 100 N
  • Distance the object is lifted up as 80 m

We are required to determine the time taken.

  • We need to know that power is the rate of work done

Therefore;

  • Power = Work done ÷ time

But, work done  = Force × distance

  • Therefore; In this case;

Work done = 100 N × 80 m

                  = 8000 Joules

  • Since , Power = Work done ÷ time

Then, time = Work done ÷ Power

Thus;

Time = 8000 J ÷ 400 W

       = 20 s

Therefore, the time taken by the engine to lift the object is 20 seconds

Kitty [74]4 years ago
3 0

Answer:

The time will be 20 seconds

Explanation:

The work is:

W=F*d

where:

F=force[N]

d=distance[m]

W=100*80=8000[J]

The time will be given by:

t= Work/power

where:

work=work done by the force[J]

Power=work done in an interval of time [Watts]

t=8000/400

Analysis of units (J / J/s) = [s]

t=20[s]

You might be interested in
When do net force is applied to a moving object it still comes to rest because of its inertia
Paraphin [41]
That is false for that.
6 0
3 years ago
Help me bro, thanks all​
bagirrra123 [75]
C beautiful yellow silk
D was sleeping
3 0
3 years ago
when a wave crosses a surface at an angle from one medium into another, why does it change directions aS IT MOVES ACROSS THE BOU
puteri [66]
 <span>This pivot is called refraction. It happens because different materials have different densities. The more dense the material the more atoms the light collides with and the slower it travels; the less dense, the fewer the collisions and hence a faster velocity. This pivoting, or refraction, is caused by the light either slowing down or speeding up.</span>
8 0
3 years ago
An object is moving with a velocity that approaches the speed of light. how does the length of the moving object appear to a sta
yaroslaw [1]
Shorter (length contraction)
4 0
3 years ago
Read 2 more answers
Read the excerpt from " Crossing the Brooklyn Ferry." Flood-tide below me! I see you face to face! Clouds of the west – sun ther
Damm [24]

Answer:

It demonstrates that the narrator is surrounded by nature.

Explanation:

Walt Whitman's "Crossing the Brooklyn Ferry" is a free verse poem written about the speaker's return trip on a ferry. He talks about his daily commute on the Brooklyn ferry, like the other commuters, and how they all share the same experience.

The given lines are from the very first stanza of the poem. The speaker repeats<em> "face-to-face" </em>when talking about nature. He sees the <em>"flood-tide below"</em> and the <em>"clouds"</em> high in the sky. This repetition demonstrates that he is surrounded by nature, amidst the throng of people around him. This shows the speaker's attitude of seeing the beauty of nature in any way he can, despite the bustle of commuting from Brooklyn to Manhattan.

Thus, the correct answer is the second option.

8 0
3 years ago
Read 2 more answers
Other questions:
  • How do you find the mechanical advantage of a wheel and axle
    11·1 answer
  • The graph shows a heating curve for water. Between which points on the graph would condensation occur?​
    10·2 answers
  • A child and sled with a combined mass of 50.0 kg slide down a frictionless slope. if the sled starts from rest and has a speed o
    6·2 answers
  • Which elements are found in all four components of Earth?​
    10·1 answer
  • Consider two metallic rods mounted on insulated supports. One is neutral, another positively charged. The charged rod is brought
    13·1 answer
  • Which formula correctly expresses the property density?
    12·1 answer
  • A 1000 kg elevator accelerates upward at 1.0 m/s2 for 10 m, starting from rest. a. How much work does gravity do on the elevator
    12·2 answers
  • A film of soapy water ( n= 1.33 ) on top of a plastic cutting board has a thickness of 233 nm. What color is most strongly refle
    8·1 answer
  • A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 65.5-gram mass is attached at the 21.0-cm
    13·1 answer
  • How do I delete a question on here
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!