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
anastassius [24]
3 years ago
9

Which best compares a brush and a commutator in an electric motor?

Physics
2 answers:
qaws [65]3 years ago
4 0

Answer: Both carry electrical current from a power source.

hope this helps (:

alisha [4.7K]3 years ago
3 0
The purpose of the brush is supposed to be to lessen the amount of damage or wear placed upon the motor. I hope this helps with your answer choices since you did not post any.
You might be interested in
A wave is a _____ that transmits energy
galben [10]

Answer is disturbance

3 0
3 years ago
Read 2 more answers
A net force acting on an object will always cause a change in the object's _________.
Nataly [62]
 cause a change in the object's velocity
3 0
3 years ago
Matthew throws a ball straight up into the air. It rises for a period of time and then begins to drop. At which points in the ba
PolarNik [594]

Answer:

If air resistance is taken as negligible, then the ball is in freefall the moment it is thrown so gravity is the only force acting on the object. If air resistance is not negligible then gravity will be the greatest force acting on the ball while it is going up and coming down, because Fair has to be less than gravity at all times otherwise the atmosphere would wither away.

3 0
3 years ago
A small candle is 38 cm from a concave mirror having a radius of curvature of 24 cm. (a) what is the focal length of the mirror?
Finger [1]
For a concave mirror, the radius of curvature is twice the focal length of the mirror:
r=2f
where f, for a concave mirror, is taken to be positive.

Re-arranging the formula we get:
f= \frac{r}{2}
and since the radius of curvature of the mirror in the problem is 24 cm, the focal length is
f= \frac{24 cm}{2} = 12 cm

8 0
3 years ago
David lifts a book 1.2 meters from the floor to the top of his desk. If the book weighed 0.50 kg, what is the gravitational pote
Anika [276]

Answer:

5.886 J

Explanation:

Given:

The mass of the book is, m=0.5 kg

Height of lift is, \Delta h=1.2 m

Acceleration due to gravity is, g=9.81 m/s²

Now, gain in gravitational potential energy is a function of change in position and is given as:

\Delta PE=mg\Delta h

Here, \Delta PE is the change in gravitational potential energy.

Plug in 0.5 kg for m, 9.81 for g and 1.2 for \Delta h. Solve for \Delta PE

\Delta PE=0.50\times 9.81\times 1.2=5.886\ J

Therefore, the gain in gravitational energy of the book is 5.886 J.

7 0
4 years ago
Other questions:
  • Which of the following changes will always increase the efficiency of a thermodynamic engine? Choose all correct statements.
    11·2 answers
  • Why is it more comfortable to fall onto a big pillow than onto a wooden floor ?
    12·1 answer
  • A balloon has a volume of 18.0-L at a pressure of 87.6 kPa. What will be the new volume when the pressure is 48.2 kPa?
    6·1 answer
  • What is required for equilibrium to exist
    5·1 answer
  • Points A, B, and C lie along a line from left to right, respectively. Point B is at a lower electric potential than point A. Poi
    15·1 answer
  • Two Earth satellites, A and B, each of mass m = 940 kg , are launched into circular orbits around the Earth's center. Satellite
    9·1 answer
  • Is the net force on an object moving with uniform velocity zero or not zero?
    8·1 answer
  • You have two identical beakers A and B. Each beaker is filled with water to the same height. Beaker B has a rock floating at the
    13·1 answer
  • A potted plant falls from a window sill and is gaining speed. which one of the following statements is true of the plant?
    9·1 answer
  • A body is under the action of two forces 7N and 10N. Find the resultant of the two forces if the forces are parallel and act in
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!