Physics, 23.11.2019 05:31, ava108

Apower station with an efficiency of 0.4 generates 108 w of electric power and dissipates 1.3×108 j of heat energy each second to the cooling water that flows through it, which increases its temperature by 3.0 celsius degrees.
find what mass of warmed water flows through the plant each
express your answer to two significant figures and include the appropriate units.

Answers: 3

Show answers

Answers

answered: alwaysneedhelp8420

$\frac{dm}{dt} = 10352 kg/s$

Explanation:

As we know that thermal energy given to the water to raise its temperature is given as

$Q = ms\Delta T$

now rate of energy given to the system is

$\frac{dQ}{dt} = \frac{dm}{dt} s \Delta T$

so we have

$\frac{dQ}{dt} = 1.3 \times 10^8$

s = 4186 J/kg C

now we have

$1.3 \times 10^8 = \frac{dm}{dt} (4186) 3$

$\frac{dm}{dt} = 10352 kg/s$

answered: Guest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

answered: Guest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Other questions on the subject: Physics

Physics, 22.06.2019 17:50, arunamvr

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

Answers: 2

continue

Physics, 22.06.2019 21:50, dzaugmavericks9145

To fully describe the photoelectric effect, scientists must consider which of the following to be quantized? o a. both light and matter o b. matter only o c. light only o d. neither light nor matter

Answers: 2

continue

Physics, 23.06.2019 02:00, Apple557

How did the germans define who was jewish?

Answers: 1

continue

Physics, 23.06.2019 02:30, rowdycar313p0ao5k

Asatellite with an orbital period of exactly 24.0 h is always positioned over the same spot on earth. this is known as a geosynchronous orbit. television, communication, and weather satellites use geosynchronous orbits. at what distance would a satellite have to orbit earth in order to have a geosynchronous orbit?

Answers: 2

continue

Do you know the correct answer?

Apower station with an efficiency of 0.4 generates 108 w of electric power and dissipates 1.3×108 j...