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
A girl is out jogging at 2.00 m/s and accelerates at 1.50 m/s^2 until she reaches a velocity of 5.00 m/s. How far does she get?
Maksim231197 [3]

Answer:

7.00 m

Explanation:

Given:

v₀ = 2.00 m/s

v = 5.00 m/s

a = 1.50 m/s²

Find: Δx

v² = v₀² + 2aΔx

(5.00 m/s)² = (2.00 m/s)² + 2(1.50 m/s²)Δx

Δx = 7.00 m

5 0
3 years ago
During which stage of the cell cycle does the cell condense chromosomes and break down the nuclear envelope? Group of answer cho
Natalka [10]

Answer:

Prophase

Explanation:

During the Prophase

6 0
2 years ago
Suppose you increase your walking speed from 4 m/s to 13 m/s in a period of 3 s. What is your acceleration?
iogann1982 [59]

The acceleration formula goes like this: a= (vf-vi)/t so it would be (13-4)/3 Thus the answer is 3m/s^2

7 0
3 years ago
How much current must be applied across a 60 Ω light bulb filament in order for it to consume 55 W of power? Unserious answers w
sergij07 [2.7K]

Answer: current I = 0.96 Ampere

Explanation:

Given that the

Resistance R = 60 Ω 

Power = 55 W

Power is the product of current and voltage. That is

P = IV ...... (1)

But voltage V = IR. From ohms law.

Substitutes V in equation (1) power is now

P = I^2R

Substitute the above parameters into the formula to get current I

55 = 60 × I^2

Make I^2 the subject of formula

I^2 = 55/60

I^2 = 0.92

I = sqr(0.92)

I = 0.957 A

Therefore, 0.96 A current must be applied.

4 0
2 years ago
Charge: A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have? (
snow_lady [41]

Answer

given,

net charge = +2.00 μC

we know,

1 coulomb charge =  6.28 x 10¹⁸electrons

1 micro coulomb  charge =  6.28 x 10¹⁸ x 10⁻⁶ electron

                                         = 6.28 x 10¹² electrons

2.00 μC = 2 x 6.28 x 10¹² electrons

              = 1.256 x 10¹³ electrons

since net charge is positive.

The number of protons should be 1.256 x 10¹³ more than electrons.

hence, +2.00 μC have 1.256 x 10¹³ more protons than electrons.

6 0
3 years ago
Other questions:
  • Jeff's body contains about 5.46 L of blood that has a density of 1060 kg/m3. Approximately 45.0% (by mass) of the blood is cells
    8·2 answers
  • Please help me. Thanks
    6·2 answers
  • A projectile has an initial horizontal velocity of 15 meters per second and an initial vertical velocity of 25 meters per second
    12·1 answer
  • Would electromagnetic waves exist if changing magnetic fields could produce electric fields but changing electric fields could n
    11·1 answer
  • Which of these scientists worked on a team that unified the electromagnetic and weak nucleus force?
    8·2 answers
  • An oxygen deficit occurs
    13·2 answers
  • An important news announcement is transmitted by radio waves to people sitting next to their radios 42 km from the station and b
    14·1 answer
  • In a butcher shop, a horizontal steel bar of mass 4.94 kg and length 1.46 m is supported by two vertical wires attached to its e
    11·1 answer
  • Please answer ASAP, and please don't joke around and actually do answer my question. I will give you brainliest if you answer it
    15·1 answer
  • A 58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move towards 3rd base with a velocity of 38.0 m/s. What i
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!