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
elena-s [515]
3 years ago
13

A 4 kW vacuum cleaner is powered by an electric motor whose efficiency is 90%. (Note that the electric motor delivers 4 W of net

mechanical power to the fan of the cleaner). What is rate at which this vacuum cleaner supplies energy to the room when running
Physics
1 answer:
RoseWind [281]3 years ago
3 0

Answer:3.6\ kW

Explanation:

Given

Power Supplied [tex]P_{input}=4\ kW[/tex]

Efficiency of the motor \neta =90\%

and \neta =\dfrac{\text{Power output}}{\text{Power input}}

\Rightarrow 0.9=\dfrac{P_{out}}{4}

\Rightarrow P=0.9\times 4

\Rightarrow P=3.6\ kW

So, vacuum cleaner delivers a power of 3.6\ kW

You might be interested in
While the negatively charged rod is near the disk without touching it, a hand briefly touches the end of the post. Then the nega
Paraphin [41]

Answer:

that initially the weather vane was at rest, by this load that remained on the pole it would begin to move.

Explanation:

Let us carefully analyze the situation, when the bar is facing the index post a load of equal magnitude, but opposite sign on its surface, these two charges are in balance; When the hand touches the pole, it creates a path to the ground where the charges that were induced on the pole can be balanced with the charge coming from the ground, leaving a zero charge on the pole.

 

   Now if the hand is removed, there can be no exchange of charges with the earth. When the bar is removed, the induced loads are redistributed in the post, but the excess loads that came from the earth that have the same value and are of a sign opposite to the induced ones remain, you want to sign that they are of the same sign as the charges of the bar.

   In summary, after the process, the post has a load of equal magnitude and sign (negative) that of the bar.

   If we assume that initially the weather vane was at rest, by this load that remained on the pole it would begin to move.

4 0
3 years ago
Explain why the light bulb isn't lighting up in the circuit<br> pictured on the right.
FromTheMoon [43]
The wires should be attached to each screw on the light not only one
8 0
3 years ago
A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 50.4 m/s and returns the shot with the ball
lora16 [44]

Explanation:

It is given that,

Mass of the ball, m = 0.06 kg

Initial speed of the ball, u = 50.4 m/s

Final speed of the ball, v = -37 m/s (As it returns)  

(a) Let J is the magnitude of the impulse delivered to the ball by the racket. It can be calculated as the change in momentum as :

J=m(v-u)

J=0.06\times (-37-(50.4))  

J = -5.24 kg-m/s

(b) Let W is the work done by the racket on the ball. It can be calculated as the change in kinetic energy of the object.

W=\dfrac{1}{2}m(v^2-u^2)

W=\dfrac{1}{2}\times 0.06\times ((-37)^2-(50.4)^2)

W = -35.1348 Joules

Hence, this is the required solution.

6 0
3 years ago
How does natural selection produce change in a population of mice?
sergey [27]

Answer:

The population of the mice will decrease to the faster, stronger, and smarter mice because the weaker will die because of natural selection.

Explanation:

5 0
3 years ago
What would happen to the fossil when weathering occurs. Would it survive ? ASAP
Kamila [148]
Yes it would servive beacuse the fossils are dug down into the rockand unable to move
6 0
3 years ago
Other questions:
  • How does a convex mirror form an image?
    11·2 answers
  • A balloon holds 5.00 mol of a mono-atomic gas at a temperature of 5.00oC and at a pressure of 1.20 atm. The gas isothermally abs
    10·1 answer
  • Which of the following will receive electrical impulses next, after the structure indicated by the red arrow?
    8·1 answer
  • 2.What is forensic paleontology?<br> 4.What are Forensic wood anatomists?
    6·1 answer
  • 2. Jessie studies seaweed and she usually takes large amounts of samples. She would take
    7·1 answer
  • A block is launched up a frictionless 40° slope with an initial speed v and reaches a maximum vertical height h. The same block
    15·1 answer
  • Which of the following statements are true regarding electromagnetic waves traveling through a vacuum? (Select all that apply.)
    8·2 answers
  • Acceleration is the magnitude of average velocity true or false
    12·1 answer
  • If a train has 1,450 kg of momentum and is traveling at 40 m/s ¿what is the mass of tren?
    12·1 answer
  • In the diagram below astronauts on different planets are dropping apples.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!