Physics, 02.02.2021 08:30 kiki1718

If a steam engine does 500 J of useful work, how much work is needed to be put in if the efficiency rating of 20%? Use your triangle,

Answers: 2

Show answers

Another question on Physics

Physics, 22.06.2019 12:00

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Answers: 3

Answer

Physics, 22.06.2019 21:50

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.

Answers: 3

Answer

Physics, 22.06.2019 23:40

What is the magnitude of the gravitational force acting on the earth due to the sun?

Answers: 1

Answer

Physics, 23.06.2019 00:10

An electromagnetic wave with frequency 65.0 hz travels in aninsulating magnetic material that has dielectric constant 3.64 andrelative permeability 5.18 at this frequency. the electric fieldhas amplitude 7.20 \times 10^{ - 3} {\rm v}/{\rm m}. a. what is the speed of propagation of the wave? b.what is the wavelength of the wave? c.what is the amplitude of the magnetic field? d.what is the intensity of the wave?

Answers: 3

Answer

You know the right answer?

If a steam engine does 500 J of useful work, how much work is needed to be put in if the efficiency...

Questions