Physics, 17.03.2020 01:21, pacpac1172

A person holds a 4.0 kg block at position A, 30 cm above ground, in contact with an uncompressed vertical spring with a spring constant of 500 N/m. the person gently lowers the block from rest at position A to rest at position B. which of the following describes the change in the energy of the block-spring-Earth system as a result of the block being lowered?
(a) The energy decreases by approx. 1.5 J
(b) The energy decreases by approx. 2.5 J
(c) The energy increases by approx. 4.0 J
(d) The energy of the system does not change.

Answers: 3

Show answers

Other questions on the subject: Physics

Physics, 22.06.2019 11:50, morenodonaldo762

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Answers: 1

continue

Physics, 22.06.2019 13:30, brsglover8355

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

Answers: 2

continue

Physics, 22.06.2019 18:00, NotYourStudent

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point

Answers: 1

continue

Physics, 22.06.2019 18:30, zoelynn9104

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above

Answers: 2

continue

Do you know the correct answer?

A person holds a 4.0 kg block at position A, 30 cm above ground, in contact with an uncompressed ver...