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
Light waves from the sun can be converted to electricity through __________.
ddd [48]

Answer:

light waves can be converted to electricity through <em>a solar cell</em>

Explanation:

3 0
3 years ago
You have 0.5 l of air at a pressure of 203 kpa and -70°c in a rigid, sealed contaainer. what is the absolute tempertaure of the
ANTONII [103]
From the information given and if the question is complete then;
Absolute temperature is the temperature in Kelvin
To convert degree Celsius to kelvin we normally add 273
that is Kelvin = deg Celsius + 273
Thus since we have been given that the air was at -70 degrees celcius;
then; - 70° C  + 273 = 203 K
 Therefore; the absolute temperature is 203 K 

5 0
3 years ago
If a 100-N net force acts on a 50-kg car, what will the acceleration of the car be?
Tema [17]
Newton's 2nd law of motion: 

                             Force = (mass) x (acceleration)

Divide each side by (mass):     

                             Acceleration = (force) / (mass)

                                               =  (100 N) / (50 kg)

                                               =  2 m/s²  


5 0
3 years ago
Two blocks of masses 3 kg and 5 kg approach each other with initial velocities 4 m/s and -6 m/s respectively. The two blocks col
Kipish [7]

Answer:

Explanation:

After the collision velocity of the particle is (4î - 3ĵ)m/s . ... A particle of mass 1 kg moving with a velocity of (4i^−3j^​)m/s collides with a fixed surface. ... Perfectly inelastic. D ... The common velocity of the blocks after collision is: ... A ball falls from a height of 5 m and strikes the roof of a lift. ... Stay upto date with our Newsletter! i know this is not right but just here for points see ya loser

6 0
3 years ago
Can someone help on this I'm really stuck
castortr0y [4]
Here, "Wavelength is same for both waves" it is the distance between two crests or two consecutive troughs, so, it is constant for both of them, you can easily figure it out.

In short, Your Answer would be "Wavelength"

Hope this helps!
5 0
3 years ago
Other questions:
  • A motorbike travels 45 miles in 15 minutes, what is its speed (hint change the minutes to hours!!)
    9·1 answer
  • What resistance would produce a current of 200A with a potiential difference of 200V?
    14·1 answer
  • Reading glasses of what power are needed for a person whose near point is 125 cm , so that he can read a computer screen at 54 c
    6·1 answer
  • Are graded receptor potentials always depolarizing? Do graded receptor potentials always make it easier to induce action potenti
    7·1 answer
  • Question 8 of 10
    13·1 answer
  • A football player is running with a velocity or 10 m/s. At that velocity, his momentum is 2500 kg*m/s. What is the football play
    11·1 answer
  • You are designing a new solenoid and experimenting with material for each turn. The particular turn you are working with is a ci
    7·1 answer
  • What is a force ?????
    5·2 answers
  • The federal government spends the most on which of the following?
    7·1 answer
  • Ilang ektarya ang lawak na itinakda ni llda na maaaring gawin palaisdaan​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!