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
olchik [2.2K]
3 years ago
6

When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for

the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 179 hp, estimate the total friction force acting on the car when it is moving at a speed of 27 m/s. One horsepower equals 746 W.
Physics
1 answer:
GaryK [48]3 years ago
6 0

Answer:

F=4945.7N

Explanation:

Most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces because these are the only forces on the horizontal direction the automobile is subjected to, besides of that generated by the engine itself. If the automobile is moving at constant speed, then these the force the engine provides is equal to the total friction force acting on the car.

We calculate then the force the engine provides. We know that power relates to work by the equation P=\frac{W}{t}, and that work relates to force by the equation W=Fd, so combining them we have:

P=\frac{Fd}{t}=Fv

Which can be written as:

F=\frac{P}{v}

And since 179hp are 179hp(\frac{746W}{1hp})=133534W, for our values the force the engine provides is:

F=\frac{133534W}{27m/s}=4945.7N

Which is also then the total friction force acting on the car.

You might be interested in
You connect a voltmeter to an unknown resistor in a circuit in order to measure the potential difference across that resistor. H
scZoUnD [109]

Answer:

option (a)

Explanation:

To make a galvanometer into voltmeter, we have to connect a high resistance in series combination.

The voltmeter is connected in parallel combination with teh resistor to find the voltage drop across it.

An ideal voltmeter has very high resistance that means it has a resistance as infinity.

8 0
4 years ago
Read 2 more answers
Explain how you would find the mass percent of each element in water
Maru [420]
<span>Percent composition is the percent by mass of each element present in a compound. In that compound, there are two moles of H atoms and 2 x 1.008 = 2.016 grams. That's how many grams of hydrogen are present in one mole of water. There is also one mole of oxygen atoms weighing 16.00 grams in the mole of water.</span>
8 0
4 years ago
7. Police would observe with a helicopter the time it would take for a car to travel between two wide lines placed
masya89 [10]

Answer:

See below

Explanation:

There are 3600 seconds / hr

7.2 s / 3600 s/hr = .002 hr

Car traveled 1/10 mile in .002 hr

    1/10 mi   /  .002 hr   =   50 mi/hr

5 0
2 years ago
A student walks (2.9±0.1)m, stops and then walks another (3.9 ±0.2)m in the same direction. What is the largest distance the stu
stepan [7]

Answer:

7.1 m

Explanation:

Given:

Distance traveled by the student in the first attempt = (2.9 \pm 0.1)\ m

Distance traveled by the student in the second attempt = (3.9 \pm 0.2)\ m

So, the maximum distance that the student could travel in this attempt = (2.9+0.1)\ m = 3.0\ m

So, the maximum distance that the student could travel in this attempt = (3.9+0.2)\ m = 4.1\ m

Since the student first moves straight in a particular direction, rests for a while and then moves some distance in the same direction.

So, the largest distance that the student could possibly be from the starting point would be the largest distance of the final position of the student from the starting point.

And this distance is equal to the sum of the maximum distance possible in the first attempt and the second attempt of walking which is 7.1 m.

Hence, the largest distance that the student could possibly be from the starting point is 7.1 m.

5 0
3 years ago
A janitor comes across a spilled substance on the floor of a highschool chemistry lab. he wants to make sure that the liquid is
MAVERICK [17]
A is the answer I think
5 0
4 years ago
Other questions:
  • ASAP pls answer right and I will mark brainiest
    5·1 answer
  • What are exmaples of how science has influce teconolgy
    5·1 answer
  • When a tennis player practices by
    7·1 answer
  • 1. Determine the magnitude of two equal but opposite charges if they attract one another with a force of 0.7N when at distance o
    7·1 answer
  • What layer of the atmosphere is hot but does not have enough gas molecules to transfer heat to you (i.e., you would not feel the
    6·1 answer
  • During which process does layer upon layer of sediment build up, exerting pressure on the layers below?
    10·1 answer
  • Does a fan that is not spinning have energy?
    15·1 answer
  • Which terrestrial world has the most atmospheric gas?
    5·1 answer
  • NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A sled and rider wi
    13·1 answer
  • In dwelling unit basements, at least ______ receptacle outlet(s) must be installed in addition to the laundry outlet
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!