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3 years ago

13

What is the sequence of energy transformations associated with a hydroelectric dam?

2 answers:

EleoNora [17]3 years ago

4 0

The sequence of energy transformations associated with a hydroelectric dam is: B) gravitational potential energy into kinetic energy into mechanical energy into electrical energy

lesya [120]3 years ago

3 0

Explanation :

A hydroelectric dam is used to produce electricity. The transformation of energy that is associated with a hydroelectric dam is :

Since the water is falling from a height so at that point the potential energy of water converts into kinetic energy. The turbine attached is used to convert the energy in the water to mechanical energy.

Finally, the mechanical energy is converted to electrical energy with the help of a generator.

Hence, the correct option is (B) " gravitational potential energy into kinetic energy into mechanical energy into electrical energy ".

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A 100 kg bungee jumper leaps from a bridge. The bungee cord has an un-streched equilibrium length of 10 m, and a spring constant

nika2105 [10]

Answer:

11.78meters

Explanation:

Given data

Mass m = 100kg

Length of cord= 10m

Spring constant k= 35N/m

At the greatest vertical distance, the spring potential energy is equal to the gravitational potential energy

That is

Us=Ug

Us= 1/2kx^2

Ug= mgh

1/2kx^2= mgh

0.5*35*10^2= 100*9.81*h

0.5*35*100=981h

1750=981h

h= 1750/981

h= 1.78

Hence the bungee jumper will reach 1.78+10= 11.78meters below the surface of the bridge

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3 years ago

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A student made a model of isostasy by placing a block of wood in a beaker of water. What does the water in the beaker represent

Setler [38]

The answer is C. the earths mantle because the wood in this case is the surface

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3 years ago

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A car is traveling in a race. The car went from the initial velocity of 35 m/s to the final velocity of 65 m/s in 5 seconds. Wha

olga55 [171]

Answer:

6m/s²

Explanation:

Given parameters:

Initial velocity = 35m/s

Final velocity = 65m/s

Time taken = 5s

Unknown:

Acceleration = ?

Solution:

Acceleration is the rate of change of velocity with time taken;

Acceleration = $\frac{Final velocity - Initial velocity }{time}$

So;

Acceleration = $\frac{65 - 35}{5}$ = 6m/s²

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2 years ago

Having landed on a newly discovered planet, an astronaut sets up a simple pendulum of length 1.25 m and finds that it makes 419

Zina [86]

Answer:

$g=2406.8m/s^{2}$

Explanation:

firstly we have to find the frequency and then the angular frequency.

The frequency will be:

$f=\frac{419}{60} \\f=6.98Hz$

The angular frequency is:

ω $=2\pi f$

ω $=2*\frac{22}{7} *6.98$

ω $=43.88rad /sec$

Now we can apply simple pendulum relationship

ω $=\sqrt{\frac{g}{l} }$

make g the subject of the formula

$g=w^{2} l\\g=43.88^{2} *1.25\\g=2406.8m/s^{2}$

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3 years ago

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