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
frez [133]
3 years ago
14

A truck is subject to a drag force, Fd, from the surrounding air: where Cd = 0.28 is the drag coefficient, A = 30 ft2 is the are

a of the front of the vehicle, and r = 0.075 lb/ft3 is the density of the air. How much power (in hp) is required to overcome drag if the truck is traveling at v=65 miles/hr? If the truck maintains a constant velocity, how much work (Btu) does the truck require for a 1-hour trip?

Physics
2 answers:
Leviafan [203]3 years ago
7 0

Answer:(a) 272897.4W (273Kw)

(b) 982.43MJ

Explanation:

See explanation in attachment.

denis-greek [22]3 years ago
6 0

Answer:

Power is 15.41 hp

Work is 39205.18 Btu

Explanation:

The power to overcome the drag force is given by the formula:

P = (1/2)ρ v³ A Cd

where,

P = Power

ρ = Density of air = 0.075 lbm/ft³

v = speed of truck = (65 miles/hr)(1 hr/3600 s)(5280 ft/1 mile) = 95.33 ft/s

A = Area = 30 ft²

Cd = drag coefficient = 0.28

therefore,

P = (1/2)(0.075 lbm/ft³)(95.33 ft/s)³(30 ft²)(0.28)

P = (272926 ft².lbm/s³)(1 lbf/32.2 lbm.ft/s²)

P = (8476 ft. lbf/s)(1 hp/550 ft.lb/s)

<u>P = 15.41 hp</u>

Now, for the work of 1 hour:

Work = W = P x time

W = (15.41 hp)(2544 Btu/h / 1 hp)(1 h)

<u>W = 39205.18 Btu</u>

You might be interested in
Betty hits a baseball.
lorasvet [3.4K]

Answer:

point 2

Explanation:

5 0
3 years ago
If the amplitude of a wave is increased the frequency of the wave will
Travka [436]

Answer:

Remain the same

Explanation:

There is no relationship between amplitude frequency.

3 0
3 years ago
Earth is about 93 million miles from the Sun but only 239,000 miles from the Moon. Likewise, the Sun has a mass that is over 20
Yakvenalex [24]

Answer:

Gravity is dependent on the mass of two bodies and the distance between them. There is a strong gravitational attraction between Earth and the Moon because they’re relatively close to one another. There is a strong gravitational attraction between Earth and the Sun because the Sun is so massive

7 0
2 years ago
The Voyager 1 spacecraft, shown below, completed its space exploration mission in 1980 and has since been traveling away from Ea
aleksklad [387]
I think b hope this helps
4 0
3 years ago
Read 2 more answers
Many species cool themselves by sweating, because as the sweat evaporates, heat is transferred to the surroundings. A human exer
max2010maxim [7]

Answer:

70713

Explanation:

Because you need to multiply the amount of water lost (2430) by the time (29.1) which will equal 70713J/g needed to counter the loss.

Hope this helps:)

4 0
3 years ago
Other questions:
  • Janet is an environmental scientist studying how the behavior of humans in urban areas affects the surrounding natural environme
    6·1 answer
  • Did the bigbang violate the law of conservation of energy and matter?
    11·1 answer
  • If you exert a horizontal force of 200 N to slide a crate across a factory floor at constant velocity, how much friction is exer
    8·1 answer
  • A sinusoidal electromagnetic wave in a vacuum is propagating in the positive z-direction. At a certain point in the wave at a ce
    8·1 answer
  • ok this question is for y'all how do what is the coriolis effect and what do it produce and how and i know the answer
    9·1 answer
  • What is the MAJOR IMPORTANT difference between velocity and speed?
    5·2 answers
  • Options are:<br>a)4Cn<br>b)5Cn<br>c)6 Cn<br>d)3 Cn<br>​
    13·1 answer
  • A gas is enclosed in a confainer fitted with a piston of cross sectional area 0.10 the pressureof the gas is maintained in 8000
    9·1 answer
  • 4. A massless spring hangs from the ceiling, and a mass is hung from the bottom of it. The mass is supported
    5·1 answer
  • (7)Figure 4 shows three charges: Q₁, Q₂ and Q3 . Determine the net force (Fnet) acting on Q3. (Hint: Draw a free body diagram of
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!