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
erma4kov [3.2K]
3 years ago
7

A 3.00 watt electric motor is plugged into an electrical outlet It takes the motor 30 00 seconds to lift a mass of 254.9 g a dis

tance of
10.00 cm. In that time, the motor has used 90.00 J of energy Assuming no energy leaves the system, how much heat has been
added to the system by the end of those 30 seconds?​
Physics
1 answer:
trasher [3.6K]3 years ago
8 0

Answer:

89.75 J

Explanation:

The motor uses 90.00 J of electrical energy.  Any of that energy that isn't used to do work is converted to heat.

The amount of work done is:

W = mgh

W = (0.2549 kg) (9.81 m/s²) (0.1000 m)

W = 0.2501 J

So the heat generated is:

Q = 90.00 J − 0.2501 J

Q = 89.75 J

You might be interested in
A projectile is launched from the ground at an angle of 60o above the horizontal. At what point in its trajectory does it have t
Elodia [21]

Answer:

It's constant everywhere in its trajectory.

Explanation:

the projectile was launched with an initial velocity, the only acceleration that is affecting the projectile's velocity is gravity.

The acceleration of gravity is practically equal everywhere on earth, so during its trajectory, we have to take into consideration only the acceleration because of gravity.

This is only correct because the projectile was launched with an initial velocity and it's not accelerating from rest and then falls.

5 0
3 years ago
About ________ percent of wais scores fall between 70 and 130.
stiv31 [10]
It is about 95%. The Wechsler Adult Intelligence Scale-IV is an IQ test that is given by therapists and measures worldwide scholarly working. It incorporates both verbal and nonverbal parts. The normal score for all tests and subtests is 100; therefore, a score of more than 100 is better than expected and beneath 100 is underneath normal.
5 0
3 years ago
Your science teacher gives you three liquids to pour into a jar. After pouring, the liquids layer as seen here. What property of
Blizzard [7]
A. mass
b. color
c. density
d. texture

i believe A
6 0
3 years ago
Read 2 more answers
What do the spheres in this model represent?
san4es73 [151]
I believe it’s B. Electrons
7 0
3 years ago
Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different r
Paladinen [302]

Answer:

Option d is correct.

Explanation:

We know , resistance of a body is directly proportional to its length and inversely proportional to its area.

R=\dfrac{\rho\ L}{A}=\dfrac{\rho\ L}{\pi r^2}      ( Here, \rho is constant dependent on object material )

Writing R_1 \ and\ R_2 also :

R_1=\dfrac{\rho\ L_1}{\pi r_1^2}\ , \  R_2=\dfrac{\rho\ L_2}{\pi r_2^2}      ( since they are of same material therefore, \rho is same.)

Now , if r_2=2r_1 \ and \ 4L_1=L_2.

Then R_1=R_2

Therefore, option d. is correct.

Hence, this is the required solution.

7 0
4 years ago
Other questions:
  • The scientific method is
    9·2 answers
  • How to find the frictional force acting on an object (not the friction coefficient)? ...?
    6·1 answer
  • Hewo thoties can ya'll do me a favor and go friend my bff on here plz and thank u
    10·2 answers
  • A runner runs the 100 meter dash in 16.6 seconds. What is their average speed? (in meters per second) SOMEBODY PLEASE HELP ME!!!
    7·1 answer
  • It took 1700 J of work to stretch a spring from its natural length of 2m to a length of 5m. Find the spring's force constant.
    9·2 answers
  • A boat is moving along the water. The forward thrust from the engines is 35,000 N. Water resistance is 20,000 N and air resistan
    10·1 answer
  • PLZZZ HELP
    14·1 answer
  • A uniform ladder stands on a rough floor and rests against a frictionless wall. Since the floor is rough, it exerts both a norma
    5·1 answer
  • How can larger telescopes
    13·1 answer
  • Every winter i fly home to Michigan. it takes 5 hours. what is my average speed?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!