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
BigorU [14]
3 years ago
7

What is the main reason the chemical energy of a fuel is never entirely converted to mechanical energy in an engine?

Physics
1 answer:
IgorLugansk [536]3 years ago
6 0

Answer: Option A) Some of the energy is lost as heat

Explanation:

Energy conversion is not always 100% accurate. In engines, due to the friction generated as machine parts roll over another some of the chemical energy of the fuel is lost as heat. That is why machine parts are lubricated to reduce friction, and then energy loss.

Thus, 100% chemical energy does not yield 100% mechanical energy, as some are lost as heat.

You might be interested in
you push a sled of mass 15 kg across the snow with a force of 180 N for a distance of 2.5 m. There is no friction. if the sled s
Oxana [17]
<span>7.7 m/s First, determine the acceleration you subject the sled to. You have a mass of 15 kg being subjected to a force of 180 N, so 180 N / 15 kg = 180 (kg m)/s^2 / 15 kg = 12 m/s^2 Now determine how long you pushed it. For constant acceleration the equation is d = 0.5 A T^2 Substitute the known values getting, 2.5 m = 0.5 12 m/s^2 T^2 2.5 m = 6 m/s^2 T^2 Solve for T 2.5 m = 6 m/s^2 T^2 0.41667 s^2 = T^2 0.645497224 s = T Now to get the velocity, multiply the time by the acceleration, giving 0.645497224 s * 12 m/s^2 = 7.745966692 m/s After rounding to 2 significant figures, you get 7.7 m/s</span>
5 0
3 years ago
A child, hunting for his favorite wooden horse, is running on the ground around the edge of a stationary merry-go-round. The ang
olga55 [171]

Answer:

9.22 s

Explanation:

One-quarter of a turn away is 1/4 of 2π, or π/2 which is approximately 1.57 rad

Let t (seconds) be the time it takes for the child to catch up with the horse. We would have the following equation of motion for the child and the horse:

For the child: s_c = \omega_ct = 0.233t

For the horse: s_h = s_0 + a_ht^2/2 = 1.57 + 0.0136t^2/2 = 1.57 + 0.0068t^2

For the child to catch up with the horse, they must cover the same angular distance within the same time t:

s_c = s_h

0.233t = 1.57 + 0.0068t^2

0.0068t^2 - 0.233t + 1.57 = 0

t= \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

t= \frac{0.233\pm \sqrt{(-0.233)^2 - 4*(0.0068)*(1.57)}}{2*(0.0068)}

t= \frac{0.233\pm0.11}{0.0136}

t = 25.05 or t = 9.22

Since we are looking for the shortest time we will pick t = 9.22 s

6 0
3 years ago
Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following s
ozzi
The answer is A- feeling a !etal wire get warmer as you roast a !arshmallow over a fire
3 0
3 years ago
Read 2 more answers
Which type of bond and how many bonds would occur as carbon dioxide (CO2) is formed from carbon in Group IVA and oxygen in Group
Rus_ich [418]

Answer:

The answer is D. Four covalent bounds

5 0
3 years ago
If you are reading this please help ASAP !!!!!
NISA [10]

Answer:

ok

Explanation:

5 0
3 years ago
Other questions:
  • Alexis de Tocqueville believed that the United States benefitted from not having a history of what social system?
    11·1 answer
  • A fully loaded, slow-moving freight elevator has a cab with a total mass of 1500 kg, which is required to travel upward 57 m in
    10·1 answer
  • A truck moving at 7.0 meters per second accelerates to a speed of 15.0 meters per second within a time of 1.5 seconds. Calculate
    5·1 answer
  • An archer wishes to shoot an arrow at a target at eye level a distance of 50.0m away. If the initial speed imparted to the arrow
    13·1 answer
  • Can a body possess velocity at the same time in horizontal and vertical directions?​
    9·1 answer
  • What is the value of y?<br>18<br>10<br>2y + 4<br>10 + 2х​
    11·1 answer
  • A car is traveling with a velocity of 5.5 m/s and has a mass of 1200 kg. What is the kinetic energy?!
    7·1 answer
  • GIVING BRAINLIEST PLEASE HELP!!
    9·1 answer
  • Which of the following describe wind patterns created by a low-pressure front, where two air masses are interacting? Choose one
    15·1 answer
  • 1 point<br> How much force is needed to accelerate an 84-kg boulder at a rate of 6.4<br> m/s/s? *
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!