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
olasank [31]
2 years ago
7

If a machine has an efficiency of 50% and an input of 3 J, what is the output?

Physics
1 answer:
uranmaximum [27]2 years ago
6 0

Answer:

150J

Explanation:

work output/work input=100%

so just make work output the subject

You might be interested in
Determine the kinetic energy of a 55kg woman running with the velocity of 5.87m/s
Greeley [361]
The formula for kinetic energy = ½m·v<span>2

1/2 * 55 kg x 5,87 m/s ^2 = 27.5 x </span>34.4569 = <span>947.56475 Joule </span>≈ 948 J
4 0
3 years ago
What is the mass of a car that has a kinetic energy if 4,320,000 J moving at 23 m/s?
Alekssandra [29.7K]

Answer:

kinetic energy=1/2mv^2.

which is 4320000=1/2×m×23^2.

which is 4320000=1/2×m×529.

4320000=264.5m.

m=4320000/264.5.

m=16332.70~16333g

4 0
3 years ago
An electric motor is connected to a battery. The current flows through brushes to a commutator ring, which is attached to a elec
Rzqust [24]

Answer:

Commutator is a ring which reverse the direction of current in AC circuit so that the coil connected to it will continuous to move in the same direction.

Explanation:

In motors there exist a coil which is rotated due to torque of magnetic field when current flow through it. Since AC current is used to run the motor so we know that AC current changes its direction after half cycle.

So here commutator plays an important role to reverse the direction of current after every half cycle so that the current goes in same direction always into the coil.

This will produce a constant direction torque on the coil so that it will rotate in same sense always.

So commutator role is to provide same direction current to the coil by reversing its direction after every half cycle

8 0
3 years ago
Acceleration occurs whenever an ___________________ force acts on an object.
leonid [27]
Acceleration occurs whenever the forces on an object are unbalanced.

It's the group of forces on the object that's either balanced or unbalanced.
There's no such thing as "an unbalanced force".

8 0
3 years ago
Read 2 more answers
During a particular time interval, the displacement of an object is equal to zero. Must the distance traveled by this object als
Gnom [1K]

Answer: No, we can have a displacement equal to 0 while the distance traveled is different than zero.

Explanation:

Ok, let's write the definitions:

Displacement: The displacement is equal to the difference between the final position and the initial position.

Distance traveled: Total distance that you moved.

So, for example, if at t = 0s, you are in your house, then you go to the store, and then you return to your house, we have:

The displacement is equal to zero, because the initial position is your house and the final position is also your house, so the displacement is zero.

But the distance traveled is not zero, because you went from you traveled the distance from your house to the store two times.

So no, we can have a displacement equal to zero, but a distance traveled different than zero.

3 0
3 years ago
Other questions:
  • While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction b
    10·1 answer
  • Which BEST describes the speed and velocity of the graph?
    13·2 answers
  • Dissolving sodium chloride will
    8·1 answer
  • The difference in the composition of the terrestrial planets and the gas giants can be explained by the different condensation
    12·1 answer
  • If a single strand of DNA were stretched out, how far would it reach?
    12·2 answers
  • An electric hoist does 500 joules of work lifting a crate 2 meters. How
    13·1 answer
  • How long will it take you to drive the 256 miles to get to the Mackinac Island Ferry if you average 70 mi/hr? If you leave at 3:
    14·1 answer
  • In lightning storms, the potential difference between the Earth and the bottom of the thunderclouds can be as high as 350MV . Th
    14·1 answer
  • On a box are the words 12 Volt : 50 mA<br> What is the resistor in Kilo-Ohm?
    10·1 answer
  • 2 someone was described in a novel as riding off into the sunset," then they'd be travelling west. o True o False ​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!