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3 years ago

Electricity produced by waterpower is ____.

Physics

2 answers:

Vikentia [17]3 years ago

7 0

Answer:

Option (D)

Explanation:

The plant in which the electricity is produced by use of water is called hydroelectric power station.

Water is stored in huge dams and then allow to fall from a great height. The potential energy of stored water is converted into kinetic energy of the flowing water. Then this kinetic energy rotates the turbines and converted into mechanical energy and then finally the coil of generator rotates and electric energy is produced.

kogti [31]3 years ago

6 0

D. Hydroelectric (hydro = water)

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Future space stations will create an artificial gravity by rotating. Consider a cylindrical space station 100 m diameter rotatin

Zielflug [23.3K]

Given Information:

Diameter = d = 100 m

Required Information:

Period = T = ?

Answer:

Period = T = 14.2 seconds

Explanation:

We know that a station revolving at an angular velocity ω, have an acceleration given by

α = ω²r

Where ω is angular velocity and r is the radius of cylindrical space station.

Normal gravity means α = g = 9.8 m/s²

ω² = α/r

ω = √(α/r)

The radius is given by

r = d/2

r = 100/2

r = 50 m

ω = √(9.8/50)

ω = 0.4427 rad/sec

We also know that

ω = 2πf

f = ω/2π

f = 0.4427/2π

f = 0.0704 rev/sec

Finally time period is given by

T = 1/f

T = 1/0.0704

T = 14.2 sec

Therefore, the rotation period is 14.2 seconds.

3 0

4 years ago

G Railroad tracks are made from segments L = 79 m long at T = 20° C. When the tracks are laid, the engineers leave gaps of width

Andreyy89

Answer:

$l=L\alpha(T_c-T)$

Explanation:

L = Initial length of segment = 79 m

T = Normal temperature = $20^{\circ}\text{C}$

l = Width to be left for expansion

$\alpha$ = Coefficient of linear expansion of the material = $12\times 10^{-6}^{\circ}\text{C}^{-1}$

$T_c$ = Maximum temperature = $39.5^{\circ}\text{C}$

$\Delta T$ = Change in temperature = $T_c-T$

The expression of linear expansion is given by

$l=L\alpha\DeltaT\\\Rightarrow l=L\alpha(T_c-T)$

The expression for the minimum gap distance l the engineers must leave for a track rated at temperature $T_c$ is $l=L\alpha(T_c-T)$

8 0

3 years ago

During each cycle of operation a refrigerator absorbs 56 cal from the freezer compartment and expels 81 cal tothe room. If one c

Alexandra [31]

Answer:

138.18 minutes

Explanation:

$L_v$ = Latent heat of water at 0°C = 80 cal/g

m = Mass of water = 570 g

Heat removed for freezing

$Q=mL_v\\\Rightarrow Q=570\times 80\\\Rightarrow Q=45600\ cal$

Let N be the number of cycles and each cycle removes 56 cal from the freezer.

So,

$55\times N=45600\\\Rightarrow N=\frac{45600}{55}$

Each cycle takes 10 seconds so the total time would be

$\frac{45600}{55}\times \frac{10}{60}=138.18\ minutes$

The total time taken to freeze 138.18 minutes

6 0

3 years ago

3 kg of saturated liquid water, contained in a rigid container at p = 1.5 bar, is heated by a 80 W heater. a) What will the phas

Mkey [24]

Is this science also? bc i know that

5 0

3 years ago

The speed at which the package hits the ground is really fast! If a package hits the ground at such a speed, it can be crushed a

Fed [463]

Answer:

B. Decrease the plane’s speed and height

Explanation:

Decrease in speed of plane:

When the speed of the plane is decreased then initial velocity of the package will be lesser. As a result, final velocity will also be lesser because in this case final velocity depends upon the initial velocity.

Decrease in height:

According to law of conservation of energy:

Loss in potential energy = Gain in Kinetic energy

mgh = ½ mV^2

It means with the decrease in height less potential energy will be converted to kinetic energy. As package has constant mass so it will gain less velocity.

7 0

4 years ago