An internal combustion engine uses fuel, of energy content 44.4 MJ/kg, at a rate of 5 kg/h. If the efficiency is 28%, determine the power output and the rate of heat rejection

Answers

Answer 1
Answer: Efficiency =  Power Output / Power Input

Power Input = Rate of Energy input = 44.4 MJ/kg * 5 kg/h

 = 222 MJ/h

But 1 hour = 3600seconds

222 MJ/h = 222 MJ/3600s =  0.061667 MW              J/s = Watts

Power input = 0.061667 MW = 61 667 W

From  Efficiency =  Power Output / Power Input

   28% =  Power Output / 61667

   Power Output = 0.28 * 61667

   Power Output = 17266.76 W
 
  Power Output = 17 267 W

 Rate of heat Rejection = Power input - Power output

                                        = 61667 - 17267 = 44400 W

Rate of heat Rejection = 44 400 W.


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Which of the outer planets is MOST like Earth? How?

Answers

Answer:

It is not impossible to answer the question, my apologies for “discrediting” the answer it would have to be Venus, the outer planet most similar to earth.

Explanation:

Venus is very similar to earth, as many studies, research, factual intellectual based concepts - the size, shape, surface gravity, average density, mass, average days of 24 hours, season changes similar to earth, and tilted axis. As well as similar climate make Venus the most accurate answer.

Hope this helps! Thank you for your time.

Answer: I would say that Saturn is most like Earth.  Not only does it have moons, like Earth, but the atmosphere is also denser like Earth. It also has windstorms, granite they are much more intense than Earth’s, but they do indeed happen. Saturn also has hydrogen gas; this gas is here on Earth supporting life in our ocean. Therefore, there is a chance that the conditions on Saturn could provide the essentials for there to be life.

A baseball has a mass of 140 grams and a softball has a mass of 280 grams. In which of the following situations would they both have the same momentum?

Answers

You haven't suggested any situations. As far as we know from the question, they're both still sitting on the shelf or in a bag somewhere, and their momenta are equal ... both zero. Momentum=(mass) x (speed). As long as the less massive ball is traveling at least twice as fast as the more massive one, its momentum is the same or greater than that of the softball.

 

The baseball is thrown at 50 m/s and the softball is thrown at 25 m/s.

hope this helps :/

a stroller is pushed from rest, accelerating at 500m/s. what is the velocity after it has traveled 6.32m?

Answers

The velocity a stroller is pushed from rest, accelerating at 500m/s is 7.5 m/s.

To find the final velocity of the stroller after it has traveled a certain distance while accelerating, one can calculate it using the third equation of motion:

v²-u² = 2as

The third equation of motion is one of the equations used in classical physics to describe the motion of an object with constant acceleration.

Given:

Acceleration, a = 500 m/s²

Distance, s = 6.32 m

The velocity is computed as:

v² - 0² = 2 × 500 × 6.32

v² = 6320

v = 79.5 m/s

Hence, the velocity a stroller is pushed from rest, accelerating at 500m/s is 7.5 m/s.

To learn more about velocity, here:

brainly.com/question/17959122

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What is the application for reflection of waves?

Answers

One big application is the manufacture and use of mirrors.

As we move above up from one trophic level to another in an energy pyramid, what happens to the energy?a. It decreases from one trophic level to another.
b. It remains the same for each trophic level.
c. It increases from one trophic level to another.

Answers

As we move above up from one trophic level to another in an energy pyramid, what happens to the energy?

a. It decreases from one trophic level to another.
b. It remains the same for each trophic level.
c. It increases from one trophic level to another.

As we move above up from one trophic level to another in an energy pyramid, the energy level decreases from one trophic level to another. The answer is letter A.

Can a simple machine’s efficiency ever be greater than 100%?
Explain your answer.

Answers

100% efficiency is not possible, so any greater than 100% is also not possible. There is always some energy waste, normally through heat, sound, or light
Personally, I believe not. 100% is the total, and therefore, it cannot possibly be above 100% percent, as this wouldn't then mean that the machine is efficiently beyond its means