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3 years ago

Which of the following statements best describes the method of energy conservation known as cogeneration?

Physics

1 answer:

Mazyrski [523]3 years ago

6 0

Answer:

heat and power

Explanation:

is the simultaneous production of electricity and heat both of which are used

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ANSWER ASAP . Which of the screws below requires the least amount of effort force to turn?

tigry1 [53]

Answer:

Screw X

Explanation:

In the screw x, the threads of the inclined plane are closer together. Therefore this screw has a greater mechanical advantage and hence it is easier to turn than the other screws.
Therefore,it takes less force to penetrate the wood with the screw X.

4 0

3 years ago

Read 2 more answers

A 100 meter rope is 20 kg and is stretched with a tension of 20 newtons. If one end of the rope is vibrated with small amplitude

dezoksy [38]

Answer:

The velocity waves before rain is 10 m/s

The velocity of wave after the rope soaked up 5 kg more is 8.944 m/s

Solution:

As per the question:

Length of the rope, l = 100 m

Mass of the rope, m = 20 kg

Force due to tension in the rope, $T_{r} = 20 N$

Frequency of vibration in the rope, f = 10 Hz

Extra mass of the rope after being soaked in rain water, m' = 5 kg

Now,

In a rope, the wave velocity is given by:

$v_{w} = \sqrt{\frac{T_{r}}{M_{d}}}$ (1)

where

$M_{d}$ = mass density

Mass density before soaking, $M_{d} = \frac{m}{l} = \frac{20}{100} = 0.20$

Mass density after being soaked, $M_{d} = \frac{m + m'}{l} = \frac{25}{100} = 0.25$

Initially, the velocity is given by using eqn (1):

$v_{w} = \sqrt{\frac{20}{0.20}} = 10 m/s$

The velocity after being soaked in rain:

$v_{w} = \sqrt{\frac{20}{0.25}} = 8.944 m/s$

3 0

3 years ago

For what angle of incidence at the first mirror will this ray strike the midpoint of the second mirror (which is s = 28.8 cm lon

Naily [24]

The angle of incidence at the first mirror will this ray strike the midpoint of the second mirror is 34.6°

Two plane mirrors intersect at right angles. A laser beam strikes the first of them at a point d = 10.0cm from their point of intersection.

To strike the midpoint of the second mirror, the ray of light will have to travel half of the distance vertically

i.e. 29/2 = 14.5

We can solve this through trigonometry.

Let the angle between the ray and the vertical plane mirror is known as α

tan α = 10/14.5

α = = 34.6°

The angle of incidence is the angle between the ray and the normal line of the mirror.

Let the angle of incidence of the first mirror be β

β = α = 34.6

Know More about the angle of incidence at:

brainly.com/question/18772331

#SPJ4

4 0

1 year ago

Please help i don't understand

IrinaVladis [17]

The answer is C why because I know it is

3 0

3 years ago

the earth has a radius of 6.38×10^16 meter and turns around once on its axis in 24 hour.what is the radial acceleration of perso

Scrat [10]

337493603.8m/s²

Explanation:

Radius of the earth = 6.38 x 10¹⁶m

time = 24hr (86400s)

Unknown:

Centripetal acceleration = ?

Solution:

The centripetal acceleration is directed inward to keep the body from falling off the surface of the earth.

centripetal acceleration = $\frac{v^{2} }{r}$

where v is the velocity and r is the radius

also;

v = wr

where w is the angular velocity

substituting in the equation for centripetal acceleration gives;

a = w²r

also w = $\frac{2 x pi}{T}$

therefore;

a = $\frac{4 \pi ^{2} r }{T^{2} }$

a = $\frac{ 4 x 3.142^{2} x 6.38 x 10^{16} }{86400^{2} }$

a = 337493603.8m/s²

learn more:

Acceleration brainly.com/question/3820012

#learnwithBrainly

5 0

4 years ago