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
8090 [49]
3 years ago
5

The room contains a refrigerator, operated by an electric motor. The motor does work at the rate of 438 W when it is running. Th

e refrigerator removes heat from the food storage space at a rate of 450 W when the motor is running. In an effort to cool the room, you open the refrigerator door and let the motor run continuously. At what net rate is heat added to (+) or subtracted from (−) the room and all of its contents?
Physics
1 answer:
yKpoI14uk [10]3 years ago
8 0

Answer: Heat is removed from the room at 12W

Explanation:

Energy (heat) is generated by the the rotor at a rate

∆Q/t = 438W

Work is done (heat removal) by the refrigerator at a rate

∆W/t = 450W

Net rate of heat removed =

∆Q/t - ∆W/t

= (438 - 450)W

= -12W

You might be interested in
In industry _____.
Alchen [17]

Answer:

B.useful products

Explanation:

industry is a sector that produces goods or services within an economy

6 0
3 years ago
Read 2 more answers
Which of the following is a balanced equation?
alexira [117]

Answer:

A. Na2S + 2KCI - 2NaCl + KZS

Explanation:

5 0
3 years ago
A 61 kg skater is traveling at 2.5 m/s while carrying a 4.0 kg bowling ball. After he throws the bowling ball forward at twice t
gregori [183]

The final velocity of the skater is 2.34 m/s forward

Explanation:

We can solve this problem by using the law of conservation of momentum. In fact, the total momentum of the system before and after the ball is thrown must be conserved, in absence of external forces.

Before the ball is thrown, the total momentum is:

p_i = (M+m)u

where

M = 61 kg is the mass of the skater

m = 4.0 kg is the mass of the ball

u = 2.5 m/s (forward) is the combined velocity of the skater and the ball

After, the ball is thrown at twice the velocity, so the final total momentum is

p_f = MV+mv

where

V is the final velocity of the skater

v = 2(2.5) = 5.0 is the final velocity of the ball

Since the total momentum must be conserved, we can write

p_i = p_f\\(M+m)u = MV+mv\\V=\frac{(M+m)u-mv}{M}=\frac{(61+4.0)(2.5)-(4.0)(5.0)}{61}=2.34 m/s

So, the skater is moving at 2.34 m/s (forward) after the shot.

Learn more about momentum:

brainly.com/question/7973509

brainly.com/question/6573742

brainly.com/question/2370982

brainly.com/question/9484203

#LearnwithBrainly

5 0
3 years ago
What is the velocity of the particle when its acceleration is zero?
Zigmanuir [339]
Its velocity would be constant 
3 0
3 years ago
If you were a pastor, and you were getting married, would you hire a pastor, or would you do the wedding yourself?
bearhunter [10]
I would hire a pastor.
4 0
3 years ago
Read 2 more answers
Other questions:
  • Each water molecule is joined to _____ other water molecules by ____ bonds.
    14·2 answers
  • Every sample of a pure substance has exactly the same composition and the same properties. true or false
    12·1 answer
  • For what values of θ are the magnitudes of the scalar product and the vector product equal? Express your answers in degrees usin
    8·1 answer
  • What is the meaning of the saying "the power of a lens is 1 dioptre "​
    11·1 answer
  • A p-type Si sample is used in the Haynes-Shockley experiment. The length of the sample is 2 cm, and two probes are separated by
    5·1 answer
  • Find the velocity of a water wave in meters per second with frequency
    15·1 answer
  • Differentiate between mass and weight
    7·1 answer
  • Why does a bowling ball and a father fall at the same speed while in a vacuum? <br> PLZ NEED HELP
    6·1 answer
  • Si un balón tiene una masa aproximada de 0.5 kg ¿con que fuerza hay que patearlo para imprimirle una aceleración de 1.5m/s2?
    11·1 answer
  • A person invests money, or ___, in a business.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!