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
kow [346]
3 years ago
11

A system experiences a change in internal energy of 36 kJ in a process that involves a transfer of 14 kJ of heat into the surrou

ndings. Simultaneously, which of the following is true?
a. Q= 14 u=36
b. U=Q-W
c. 14-36=22
d. 22 kJ of work is done on the system.
Physics
1 answer:
Andre45 [30]3 years ago
7 0

Answer:

b. U = Q - W

Explanation:

Given;

change in internal energy, ΔU = 36 kJ

heat transferred to the surroundings Q  = 14 kJ

Apply first law of thermodynamic; the change in internal energy is equal to heat added to the system minus work done by the system.

ΔU = Q - W

Since heat was lost to surroundings, Q = - Q

ΔU = (-Q) - W

36 kJ = -14 kJ - W

36 kJ + 14 kJ = - W

50 kJ = - W

W = - 50 kJ (the negative sign shows that work has been done on the system)

Thus, 50 kJ of work is done on the system.

The only correct answer in the given options is "b" U = Q-W

You might be interested in
What is the awnser to Blank occurs when a substance changes from a liquid to a gas
PolarNik [594]
Evaporation (or another word to use is water vapor.)
3 0
3 years ago
Why do we use atomic models?
vlabodo [156]
Models help us to understand systems and their properties
3 0
1 year ago
What are the uses of rockets ​
lora16 [44]

They are used to be able to go out of Earth and into space to Be able to explore and toBe able to prove and tell about Earth and space

8 0
3 years ago
an object has a displacement of + 12 m in 6 seconds if the average velocity is found using the equation change in position / ela
rosijanka [135]

Answer:

+2m/s

Explanation:

average   velocity = displacement traveled / total time taken

                           = +12m/ 6s

                           = +2 m/s

6 0
3 years ago
A motorcycle of mass 100 kilograms slowly rolls off the edge of a cliff and falls for three seconds before reaching the bottom o
Jet001 [13]

Answer:

C) 3,000 kg m/s

Explanation:

We can consider the horizontal velocity of the motorcycle to be zero, since it rolls off the edge of the cliff very slowly. So, we only need to find the vertical velocity at the time of the impact with the ground.

The vertical velocity of the motorcycle at time t is given by (free-fall motion):

v(t)=v_0 -gt

where

v_0=0 is the initial vertical velocity (zero, since the motorcycle is not moving)

g = 9.8 m/s^2 is the acceleration due to gravity

t is the time

Since the motorcycle hits the ground after t = 3 seconds, we have

v(3 s)=0-(9.8 m/s^2)(3 s)=-29.4 m/s

And since we know its mass, m=100 kg, we can find its momentum:

p=mv=(100 kg)(-29.4 m/s)=-2940 kg m/s \cdot -3000 kg m/s

and the negative sign simply means downward direction.

8 0
3 years ago
Other questions:
  • Change in Energy Quick Check
    9·1 answer
  • PLZ ANSWER ASAP
    13·1 answer
  • Based on how solar radiation received varies with latitude, it can be inferred that seasonal temperature contrasts would _______
    5·2 answers
  • Explain why the speed of a sled is increases as it moves down a snow -covered hill, even though no one is pushing the sled
    10·1 answer
  • Which of the following items is most sensitive to increased acidity in the environment?
    10·2 answers
  • What orbital motion is the result of _______ and each satellite's forward inertia
    15·1 answer
  • What's the difference between a direct relationship and a positive one?
    13·1 answer
  • If the power developed in an electric circuit is doubled the energy used in one second is
    14·1 answer
  • A 35.0-g object connected to a spring with a force constant of 40.0 N/m oscillates with an amplitude of 4.00 cm on a frictionles
    11·1 answer
  • Name two types of mechanical weathering in NewBedford
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!