answer.
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
Gekata [30.6K]
2 years ago
14

(Double points) A machine receives electricity that enables it to deliver a total of 8,542 N of force for the completion of its

task. The machine's useful output is 7,023 N. What is the machine's efficiency?
Physics
1 answer:
storchak [24]2 years ago
4 0

Answer: machine's efficiency = 82.2%

Explanation:

Efficiency of a machine is the capability of a machine to convert input to output without waste.

It can be expressed as

Efficiency = output/ input × 100%

Output = 7,023N

Imput = 8,542N

Efficiency = 7,023N/8,542N × 100%

Efficiency = 82.2%

You might be interested in
An engine does 15.0 kj of work while exhausting 37.0 kj to the cold reservoir. What is the efficiency of the engine?
Nataliya [291]

Answer:

28.8 %

Explanation:

The efficiency of an engine is given by:

\eta = \frac{W}{Q_{in}}

where

W is the useful work done

Q_in is the heat in input

For this machine, we have

W = 15.0 kJ is the work done

37.0 kJ is the heat exchausted to the cold reservoir, so the total amount of heat in input is

Q_{in} = 15.0 kJ + 37.0 kJ=52.0 kJ

And so the efficiency is

\eta=\frac{15.0 kJ}{52.0 kJ}=0.288

which corresponds to 28.8 %.

5 0
2 years ago
Timmy drove 2/5 of a journey at an average speed of 20 mph.
mixer [17]

Answer:

4hr

Explanation:

5 0
2 years ago
Read 2 more answers
Daniel is 50.0 meters away from a building. He observes that his line-of-sight to the tip of the building makes an angle of 63.0
frez [133]
Since his line of sight 63 degrees makes with the tip of the building

Tan63° =  height of building / Horizontal distance

tan63° =  Height / 50

50tan63° = Height

Height = 50tan63°

Height ≈ 50*1.9626

Height ≈ 98.13 m

Height of the building is ≈ 98.13 m. Mind you in solving for this height we have neglected the height of Daniel.

The height of building actually should be 98.13 m plus the height of Daniel. Since the 63° was measured from his eye level.
4 0
2 years ago
Two charges, qA and qB, are separated by a distance, d, and exert a force, F, on each other. Analyze Coulomb's law and answer th
maria [59]

Answer: a. F doubled

b. F reduced by one-quarter i.e

1/4*(F)

c. 1/9*(F)

d. F increased by a factor of 4 i.e 4*F

e. F reduces 3/4*(F)

Explanation: Coulombs law states the force F of attraction/repulsion experience by two charges qA and qB is directly proportional to thier product and inversely proportional to the square of distance d between them. That is

F = k*(qA*qB)/d²

a. If qA is doubled therefore the force is doubled since they are directly proportional.

b. If qA and qB are half, that means thier new product would be qA/2)*qB/2 =qA*qB/4

Which means the product of charge is divided by 4 so the force would be divided by 4 too since they are directly proportional.

c. If d is tripped that is multiplied by 3. From the formula new d would be (3*d)²=9d² but force is inversely proportional to d² so instead of multiplying by 9 the force will be divided by 9

d. If d is cut into half that is divided by 2. The new d would be (d/2)²=d²/4. So d² is divided by 4 so the force would be multiplied by 4

e. If qA is tripled that is multiplied by 3. F would be multiplied by 3 also, if at the same time d is doubled (2*d)²= 4*d² . Force would be divided by 4 at same time. So we have,

3/4*F

6 0
2 years ago
In Physics lab, Ellen has been given the task of constructing a simple motor. She must find common household items at home and b
Aleks [24]

Answer:

a) battery-->electrical current-->copper wire rotor -->magnet--> mechanical energy

Explanation:

6 0
2 years ago
Read 2 more answers
Other questions:
  • Exhaust outlets are often located in the area under a boat's swim platform. this area should be strictly off limits. what is the
    13·2 answers
  • A car is driving at a velocity of 24 m/s. If its brakes can supply an acceleration of -5.0 m/s2, how much time will be required
    6·2 answers
  • If the current in a wire increases from 5 A to 10 A, what happens to its magnetic field? If the distance of a charged particle f
    14·2 answers
  • Carbon dioxide (CO2) gas within a piston–cylinder assembly undergoes a process from a state where p1 = 5 lbf/in.2 , V1 = 2.5 ft3
    9·1 answer
  • A boy is whirling a stone around his head by means of a string. The string makes one complete revolution every second; and the m
    8·1 answer
  • Two 0.40 kg soccer ball collide elastically in a head-on collision. The first ball starts at rest, and the second ball has a spe
    8·2 answers
  • In the sum of 54.34 and 45.66, the number of significant figure for the<br>answer is​
    5·1 answer
  • We know the moon circulates the Earth. Suppose the mass of the Earth and moon are 5.9742 x1024 kg and 7.36 x 1022 kg, whereas th
    9·1 answer
  • Glider‌ ‌A‌ ‌of‌ ‌mass‌ ‌0.355‌ ‌kg‌ ‌moves‌ ‌along‌ ‌a‌ ‌frictionless‌ ‌air‌ ‌track‌ ‌with‌ ‌a‌ ‌velocity‌ ‌of‌ ‌0.095‌ ‌m/s.‌
    8·1 answer
  • The energy transferred to the water in 100 seconds was 155 000 J. specific heat capacity of water = 4200 J/kg °C
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!