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
AveGali [126]
3 years ago
14

What is the efficiency of a machine?​

Physics
1 answer:
Julli [10]3 years ago
7 0

Answer:

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work).

Explanation:

It is a measure of how well a machine reduces friction.

You might be interested in
How come in free fall you feel weightless even though gravity is pulling down on you?
AysviL [449]
Feeling of Weight.

When walking, you feel the weight on your feet, therefore, your brain automatically refers to it as a source of weight.

In the air there is no platform to land on, therefore the brain does not have the conscience to register you getting pulled down. 
7 0
3 years ago
A long, straight metal rod has a radius of 5.75 cm and a charge per unit length of 33.3 nC/m. Find the electric field at the fol
PIT_PIT [208]

Answer:

Explanation:

From the question;

We will make assumptions of certain values since they are not given but the process to achieve the end result will be the same thing.

We are to calculate the following task, i.e. to determine the electric field at the distances:

a)  at 4.75 cm

b)  at 20.5 cm

c) at 125.0 cm

Given that:

the charge (q) = 33.3 nC/m

= 33.3 × 10⁻⁹ c/m

radius of rod = 5.75 cm

a) from the given information, we will realize that the distance lies inside the rod. Provided that there is no charge distribution inside the rod.

Then, the electric field will be zero.

b) The electric field formula E = \dfrac{kq }{d}

E = \dfrac{9 \times 10^9 \times (33.3 \times 10^{-9}) }{0.205}

E = 1461.95 N/C

c) The electric field E is calculated as:

E = \dfrac{9 \times 10^9 \times (33.3 \times 10^{-9}) }{1.25}

E = 239.76 N/C

7 0
3 years ago
Erica (38 kg ) and danny (43 kg ) are bouncing on a trampoline. just as erica reaches the high point of her bounce, danny is mov
AfilCa [17]
<span>2.5 m/s going upward.
   In the situation described, Erica and Danny undergo a non-elastic collision which will conserve their combined momentum. Since Erica is stationary, her momentum is 0. And since Danny is moving upward at 4.7 m/s his momentum is 43 kg * 4.7 m/s = 202.1 kg*m/s. Assuming that both Erica and Danny will be moving as a joined system, their combined mass is 38 kg + 43 kg = 81 kg. Since the momentum will be the same, their velocity will be 202.1 kg*m/s / 81 kg = 2.495061728 m/s. Since we only have 2 significant figures in the provided data, rounding the result to 2 significant figures gives a velocity of 2.5 m/s going upward.</span>
4 0
3 years ago
An object can have forces acting upon it, but might not accelerate<br><br> True<br> or<br> False?
vivado [14]

Answer:

true

Explanation:

if you apply force to the top of a square it will not move

8 0
3 years ago
What is density?
a_sh-v [17]

Answer:

B- The amount of matter in a certain

amount of space

Explanation:

Density is the amount of matter an object has in a certain space. To find density, divide the mass of an object by the volume of an object.

8 0
3 years ago
Read 2 more answers
Other questions:
  • A car is moving with speed 60 m/s and acceleration 4 m/s2 at a given instant. (a) using a second-degree taylor polynomial, estim
    7·1 answer
  • This is one of a pair of problems that treat the same situation. This one uses a quantum mechanical analysis, while the other us
    8·1 answer
  • How does the motion of an airplane compare to the motion of a rocket ?
    11·1 answer
  • The energy of a wave is directly proportional to the square of the ___. D.Amplitude c. crest b. wavelength a.frequency
    13·1 answer
  • What is one way in which radioactive decay is used to benefit society?
    15·2 answers
  • А)
    12·1 answer
  • Which of the following is not an electromagnetic wave
    15·1 answer
  • An object on the end of a spring with spring constant k moves in simple harmonic motion with amplitude A and frequency f. Which
    5·1 answer
  • Which statement best describes particles that are affected by the strong
    11·2 answers
  • A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the sub
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!