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
Marina86 [1]
3 years ago
13

A 2 kg object is released from rest from a height of 3 m above Earth's surface. How much kinetic energy does the object have whe

n it reaches a height of 1 m? (A) 2.5 J (B) 10 J (C) 20 J (D) 30 J (E) 40 JFigure:A 2kg object is hanging
Physics
1 answer:
borishaifa [10]3 years ago
4 0

Answer:

Kinetic energy, E = 40 Joules

Explanation:

Given that,

Mass of the object, m = 2 kg

It is released from rest from a height of 3 m above Earth's surface, h_1=3\ m

We need to find the kinetic energy the object have when it reaches a height of 1 m, h_2=1\ m

It is a case of conservation of mechanical energy. It states that the total energy of the system remains constant. The kinetic energy is given by :

E=mg(h_1-h_2)

E=2\times 10\times (3-1)

E = 40 Joules

So, the kinetic energy of the object when it reaches a height of 1 m is 40 joules. Hence, this is the required solution.

You might be interested in
What is meant by 'wasted energy'?
schepotkina [342]
Wasted energy is an energy which is transformed without significant use.
5 0
4 years ago
Read 2 more answers
Which of the following statements best describes the second law of
Serga [27]

Answer:

B

Explanation:

Heat flows from hot to cold to lower the temperature of hot areas and increase temperature of cold areas. The end result is that the 2 areas have the same temperature, thus increasing entropy.

7 0
4 years ago
Which option would it be
guapka [62]
It would be 4 atm, because the way to figure out the final pressure is that (P1)(V1)=(P2)(V2)

meaning that the original pressure x original volume is equal to the final pressure x final volume. This gas law is called Boyle's law if you'd like to learn more about it.

But (1 atm)(40 mL)=(4 atm)(10 mL)

So it would be the second choice.
7 0
3 years ago
How many milligrams in 1 gram. ??? HELP !!!
blagie [28]
1,000 milligrams = 1 gram
2,000 milligrams = 2 grams
3,000 milligrams = 3 grams
4,000 milligrams = 4 grams
3 0
4 years ago
Read 2 more answers
What is the formula you use to determine the gravitational potential energy of a object
kozerog [31]

Gravitational potential energy, relative to some level =

       (mass of the object)
times
       (height above the reference level)
times
       (acceleration due to gravity) .
4 0
3 years ago
Other questions:
  • 1) My 14V car battery could be used to charge my laptop, but I need to use an inverter to first convert it to a standard 120V. T
    13·1 answer
  • How did thomson’s findings revise dalton’s atomic theory??
    7·1 answer
  • The primary coil of a transformer contains 100 turns; the secondary has 200 turns. the primary coil is connected to a size-aa ba
    5·2 answers
  • Can someone pls help.
    10·1 answer
  • A dog sits 1.5 m from the center of a merry-go-round. The merry-go-round is set in motion, and the dog's tangential speed is 1.5
    14·1 answer
  • Which does not provide the energy to spin a turbine?
    9·2 answers
  • An electronic instrument that measures power and frequency of electronic signals is the
    11·1 answer
  • Which terms describe the purpose of antennas on devices that use radio waves
    11·1 answer
  • A thunderclap sends a sound wave through the air and the ocean below. The
    12·1 answer
  • Which of the following is NOT true in terms of what to consider when judging eye witness accounts?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!