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
worty [1.4K]
3 years ago
7

A weightlifter lifts a 100-kg weight 1.5 meters off the floor at a constant velocity. Which statement about this situation is tr

ue?
The mechanical energy of the system increased because of friction.

The mechanical energy of the system decreased because of friction.

The kinetic energy of the weight decreased as it was lifted up.

The potential energy of the weight decreased as it was lifted up.
Physics
2 answers:
Effectus [21]3 years ago
8 0

Answer:

Give the person above me brainliest please!

Explanation:

Because they are a legend!

kirill [66]3 years ago
6 0

Answer: 1) c. The energy on the macroscopic scale decreased, and the energy on the molecular scale increased.

2) d.  Friction converts some energy on the macroscopic scale to energy on the molecular scale.

3) d. The mechanical energy of the system decreased because of friction.

4) d. The mechanical energy of the system at the beginning of the experiment is equal to the mechanical energy of the system at the end of the experiment.

5) d. The mechanical energy of the system decreased due to the transfer of energy on a macroscopic scale to energy on a molecular scale.

You might be interested in
What is meant by the statement "Motion is relativel"?
aleksklad [387]

Answer:

when an object move from its place is called an mation

4 0
3 years ago
10x2poooop11111111qq64
yulyashka [42]

Answer:

10×2=20

10×2÷64=??

I am not sure what you are trying to say...

7 0
2 years ago
Read 2 more answers
Explain how you can determine the direction of a magnetic field produced by a wire if you know the diection of the current throu
ololo11 [35]

Explanation:

Right hand thumb rule : Point the thumb of your right hand in the direction of the current flow, the direction of curvature of the fingers will give us the direction of the magnetic field produced by current carrying wire. This rule was given by Maxwell.

1) If the current is moving in upward direction , the direction of the magnetic field will be in anti clock wise direction.

2) If the current is moving in downward direction , the direction of the magnetic field will be in clock wise direction.

5 0
3 years ago
Read 2 more answers
The greater the mass of an object, the greater its force due to gravity
Serga [27]
What is the question?
6 0
3 years ago
A ball is thrown vertically upwards with a velocity
zhuklara [117]

Answer:

Explanation:

The acceleration of gravity is 9.8m/s^2.

So to calculate the time it will take to make the ball stop(which btw means the ball now reach its greatest height), use the formula V1=V0+at. V1 is the final velocity(which is 0), V0 is the starting velocity(which is 30m/s), and the a(cceleration) is 9.8m/s^2.

(You can ignore the fact "at" is -30 instead 30, it's because the directions two velocity travel are opposite. )

We can now know the time it takes to make the ball stop just by the gravitational force is about 3 sec.

Use another formula S=1/2at^2, to find out the S(height) is 1/2*9.8*3^2=44.1, which is approximately D.45m .

6 0
3 years ago
Other questions:
  • If my final exam is worth 30% and my class average is 80, what do I need to get to pass the exam?
    10·1 answer
  • What can cause you to observe that sone objects fall faster than others?
    11·1 answer
  • Amy walks 32 m right and then 12 m left. She turns and walks another 28 m right and then turns and walks 7 m left. What is Amy's
    11·1 answer
  • Refraction occurs when __________.
    12·2 answers
  • What nutrient does your body need the most? A. protein B. vitamins C. water D. carbohydrates
    11·2 answers
  • air passing over an airplanes wing travels ,and therefore exerts pressure.than air traveling beneath the wing.
    9·1 answer
  • _______________have a negative charge and are located on the outside of the nucleus.
    6·1 answer
  • describe in detail and example of a character from a television program movie or book you have recently read that is faced with
    9·1 answer
  • In the long jump, an athlete launches herself at an angle above the ground and lands at the same height, trying to travel the gr
    13·1 answer
  • 1. Although mercury is a metal, it is a liquid at room temperature. Mercury melts at about -39°C. If
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!