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
Ronch [10]
3 years ago
14

A gasoline engine with efficiency 25% delivers 1500 J of mechanical work per cycle. How much heat does this engine discard per c

ycle? (A) 6000 (B) 7500J (C) 4500J (D) 375 (E) 2000
Physics
1 answer:
Eduardwww [97]3 years ago
4 0

Answer:

(C) 4500J

Explanation:

η = Efficiency of the gasoline engine = 25% = 0.25

W = mechanical work done by engine per cycle = 1500 J

E = Total input heat

mechanical work done by engine per cycle is given as

W = η E

1500 = (0.25) E

E = 6000 J

U = heat discarded by the engine per cycle is given as

U = E - W

U = 6000 - 1500

U = 4500 J

You might be interested in
. If she
I am Lyosha [343]

Answer:

9 meters

Explanation:

Given:

Mass of Avi is, m=40\ kg

Spring constant is, k=176,400\ N/m

Compression in the spring is, x=20\ cm=0.20\ m

Let the maximum height reached be 'h' m.

Now, as the spring is compressed, there is elastic potential energy stored in the spring. This elastic potential energy is transferred to Avi in the form of gravitational potential energy.

So, by law of conservation of energy, decrease in elastic potential energy is equal to increase in gravitational potential energy.

Decrease in elastic potential energy is given as:

EPE=\frac{1}{2}kx^2\\EPE=\frac{1}{2}\times 176400\times (0.20)^2\\EPE=88200\times 0.04=3528\ J

Now, increase in gravitational potential energy is given as:

GPE=mgh=40\times 9.8\times h=392h

Now, increase in gravitational potential energy is equal decrease in elastic potential energy. Therefore,

392h=3528\\\\h=\frac{3528}{392}\\\\h=9\ m

Therefore, Avi will reach a maximum height of 9 meters.

6 0
3 years ago
Which statement best describes a device that has a high energy efficiency? Its ratio of energy absorbed to energy released is hi
Stels [109]

Answer:

It wastes little energy

Explanation:

  • The efficiency of a machine refers to the ratio of work output to the work input as a percentage.
  • The efficiency of most machines is less than 100% because some work is lost  due to friction and heat.
  • Therefore, a machine with high efficiency has less wastage of energy due to factors such as friction of the moving parts. Conversely, low efficiency means there is more wastage of energy.
3 0
3 years ago
Read 2 more answers
A 0.55-μF capacitor is connected to a 3.5-V battery. How much charge is on each plate of the capacitor?
yan [13]

Answer:

1.925 μC

Explanation:

Charge: This can be defined as the product of the capacitance of a capacitor and the voltage. The S.I unit of charge is Coulombs (C)

The formula for the charge stored in a capacitor is given as,

Q = CV ................... Equation 1

Where Q = charge, C = Capacitor, V = Voltage.

Note: 1 μF  = 10⁻⁶  F

Given: C = 0.55 μF = 0.55×10⁻⁶ F, V = 3.5 V.

Substitute into equation 1

Q = 0.55×10⁻⁶×3.5

Q = 1.925×10⁻⁶ C.

Q = 1.925 μC

Hence the charge on the plate = 1.925 μC

6 0
3 years ago
Read 2 more answers
1. Which wave refracts?
Digiron [165]

Answer:

I want to say your answer is A) an ocean wave approaching the shore at an angle. But not 100% sure. I'm so sorry if it's wrong I really tried to figure it out.

Explanation:

Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refaction , or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves. Thus, if water waves are passing from deep water into shallow water, they will slow down. ( This is what I read on google maybe it'll help you out).

8 0
3 years ago
A monochromatic light beam with a quantum energy value of 4.3 ev is incident upon a photocell. the work function of the photocel
Black_prince [1.1K]
Give me some answer choices and i will be happy to help
7 0
3 years ago
Read 2 more answers
Other questions:
  • Which best describes the second law of thermodynamics? energy is not created nor destroyed, but it can change into matter. energ
    12·2 answers
  • "There are two types of error that can occur when making measurements: systematic and random error. How you correct the error de
    12·1 answer
  • Function do lappet which faced vultures serve in a temperate grassland
    5·2 answers
  • Calculate the work against gravity required to build the right circular cone of height 4 m and base of radius 1.2 m out of a lig
    12·1 answer
  • How are gravity and electromagnetic force similar and different?
    7·1 answer
  • When holes are drilled through the wall of a water tower, water will spurt out the greatest horozontal distance from the hole cl
    11·1 answer
  • What is fundamental unit?​
    8·1 answer
  • Compare the signs of ƒ for lenses and mirrors.
    13·2 answers
  • Suppose you are standing at the earth's geographic north magnetic pole, the place on the earth's surface that compasses point to
    12·1 answer
  • 4. A desk with a mass of 10 kg is pushed across a floor with an acceleration of 4 m/s?. What
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!