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
tia_tia [17]
3 years ago
15

Using 1000 j of work, a toy elevator is raised from the ground floor to the second floor in 20 s. how much power does the elevat

or use?
Physics
1 answer:
Anastasy [175]3 years ago
3 0
Power (watts) = work done (joules) ÷ time (seconds)

power (watts) = 1000J ÷ 20s

power (watts) = 50w

You might be interested in
A 70 kg object strikes the ground with 2500 J of KE after falling freely from rest. How far above the ground was the object when
Kitty [74]

Answer:

3.64 m

Explanation:

m = Mass of object = 70 kg

Kinetic energy of the object = 2500 J

g = Acceleration due to gravity = 9.81\ \text{m/s}^2

h = Height from which the object is dropped

Kinetic energy is given by

\dfrac{1}{2}mv^2=2500\\\Rightarrow v^2=\dfrac{2\times 2500}{70}

From conservation of energy we get kinetic energy equal to potential energy.

\dfrac{1}{2}mv^2=mgh\\\Rightarrow h=\dfrac{1}{2g}v^2\\\Rightarrow h=\dfrac{1}{2\times 9.81}\times \dfrac{2\times 2500}{70}\\\Rightarrow h=3.64\ \text{m}

The object was released from a height of 3.64 m.

6 0
3 years ago
Repulsion is the sure way to test magnetism.Why?​
jeyben [28]

Answer:

Repulsion is the sure test for magnetism because it occurs only when two like poles of a magnet exist while the attraction phenomenon can occur between two unlike poles of a magnet and also between a magnet and a magnetic material means if there are two magnets they will attract each other and suppose if one material

8 0
3 years ago
What is electrical energy?
olga nikolaevna [1]
Electrical energy is a particle that moves through a wire and transferred into homes, work, etc to make electricity work in objects.
8 0
4 years ago
You are riding on your bike and stop pedaling , coasting along the road. eventually, your bike slows down and stops. what happen
andrew11 [14]
<span>When still rolling your bike had kinetic energy, or energy in the form of motion. The forces resisting this motion--a mixture of many factors including air resistance, tire friction, friction in the hubs of the wheels, etc...--eventually decrease the kinetic energy of the bike to zero as it reaches a complete stop.</span>
8 0
3 years ago
A computational model predicts the speed of a roller coaster car at different heights given its speed at the lowest height of it
s2008m [1.1K]

Answer:

the answers, the correct one is A   v= 22.5 m/s

Explanation:

We can solve this problem using the concepts of conservation of mechanical energy

Starting point. Lowest point of the trajectory

       Em₀ = K = ½ m v₀²

Final point. When it is at a height of y = 20 m

       Em_{f} = K + U = ½ m v² + mg y

     

how energy is conserved

         Emo = Emf

         ½ m v₀² = ½ m v² + m g y

         v² = v₀² + 2 g y

 

let's calculate

         v²2 = 30 2 + 2 9.8 20

         v² = 508

         v²= ra 508

         v² = 22.54 m / s

When checking the answers, the correct one is A

4 0
3 years ago
Other questions:
  • Suppose a certain scale is not calibrated correctly, and as a result, the mass of any object is displayed as 0.75 kilogram less
    9·1 answer
  • What can we say about the rock as it falls to Earth?
    7·2 answers
  • By approximately how much does your gravitational potential energy change when you jump
    11·1 answer
  • From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.10 m/s and angle
    14·1 answer
  • A particle in circular motion performs 30 oscillation in 6 seconds. what is it angular velocity​
    7·1 answer
  • A 3.00 kg toy falls from a height of 1.00 m. What will the kinetic energy of the toy be just before the toy hits the ground? (As
    15·2 answers
  • Given the atomic radius of argon, 0.97 Å, and knowing that a sphere has a volume of 4πr3/3, calculate the fraction of space that
    6·1 answer
  • 23 POINTS!! will get brainiest
    11·1 answer
  • A dog jumps 0.80 m to catch a treat. The dog's displacement vector is shown below.
    6·1 answer
  • Why does mars take 462.3 earth days more than venus to relove around the sun?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!