(1 mark)
(b)
Electricity can also be generated in a pumped storage hydroelectric power station
An advantage of pumped storage hydroelectric power stations is the short start-up fime
they have
(b) (i) What is the importance of the short start-up time?
(1 mark)
(b) (ii) Give one other advantage of a pumped storage hydroelectric power station.
(1 mark)

Answer:

Brazil, France, Spain ,Puerto rico,Venezuela, Yemen

Explanation:

Answer: The electrons stop flowing, and the current stops. The power source would no longer provide a flow of electrons.

Answer:

A)It would stay stationery as the resultant force is 0.

B)It would move towards the right as the resultant force is 300N due right.

C)It would move left as the resultant force is 300N due left.

Explanation:

Please make it brainiest answer

Answer:

2450 J

Explanation:

Given that,

A 50Kg girl jumps off a 5-meter-high diving board.

We need to find the kinetic energy of the girl before she hits the water. At this point the kinetic energy becomes equal to the potential energy such that,

[tex]K=mgh\\\\K=50\times 9.8\times 5\\\\K=2450\ J[/tex]

So, her kinetic energy right before she hits the water is equal to 2450 J.

Answer:

Observational data collected by doppler radar, radiosondes, weather satellites, buoys and other instruments are fed into computerized NWS numerical forecast models.

this question is centered around newtons second law f=ma

First you need to find the acceleration

[tex] acceleration = \frac{8 - 0}{22} [/tex]

that gives you 0.36 recurring(on both numbers) m/s²

mass= force ÷ acceleration

[tex] mass = \frac{31}{0.36recurring} [/tex]

mass= 85.25 kg

if you want to check

f=ma

85.25 × 0.36 recurring (remember its on both numbers not just 6) = 31 N

Answer:

Explanation:

Givens

F = 31 N

vi = 0

vf = 8 m/s

t = 22 seconds

m = ?

Formula

F = m ( vf - vi)/t

Solution

31 = m (8 - 0) / 22             Multiply both sides by 22

31 * 22 = 8 * m

8m = 682                          Divide by 8

m = 682 / 8

m = 85.25

Answer:

Explanation:

hope this helps!

thermal,true the explanation is because the other guy said so

Answer:

There is no sentence.

Explanation:

Kinetic energy and velocity are at zero when the magnets are held apart, and both increase rapidly when they are released and move together. Energy stored in the magnetic field decreases.

Graph for the two magnets held apart, kinetic energy is highest when the magnets first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.

The magnetic field is the field in the space and around the magnet in which the magnetic field can be filled.

Magnetic force is the force of attraction or repulsion between two poles of the two magnets. The magnetic force is also appearing between two electrically charged bodies.

Two magnets held apart. Once released, the south pole of one magnet moves toward the north pole of another magnet until the magnets collide.

The graph reflection of kinetic energy of magnet -

Therefore, graph for the two magnets held apart, kinetic energy is highest when the magnets first released, then it decreases steadily. Energy stored in the magnetic field becomes zero.

Learn more about magnetic field here;

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Answer:

X rays

Explanation:

doctors use x rays to look at your bones

if my answer helps please mark as brainliest.

Answer:

D ) Fusion in the sun

Explanation:

All reactions in the sun produce thermal energy.

Answer:

a lodestone

Explanation:

a lodestone is a naturally magnetized piece of the mineral magnetite.

Answer:

250Nm

Explanation:

Given parameters:

Length of the long pry bar  = 1m

Force acting on it  = 250N

Angle  = 90°

Unknown:

Amount of torque applied  = ?

Solution:

Torque is the turning force on a body that causes the rotation of the body.

The formula is given as:

 Torque  = Force x r Sin Ф  

r is the distance

 So;

   Torque  = 250 x 1 x sin 90  = 250Nm

Answer:

I believe that B is the right one.

Answer:

A) The ball will roll forever in a straight path.

Answer:

7.27 m/s

Explanation:

40/5.5 = 7.27m/s

Answer: The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another. Hopefully i helped

Explanation:

1. R

2. P and Q

3. P and Q

4. Q

5. 2 seconds

Wait have a diagram to explain better. It's attached above.

Answer: woodworker

Explanation: just took it

Based on the data table, the profession with the greatest risk of sound damage to the ear is likely to be a woodworker. The correct option is A.

Sound waves are a type of longitudinal wave that travels through a medium, such as air or water, and is caused by the vibration of particles in the medium. When an object vibrates, it creates a disturbance in the surrounding particles, which in turn creates a wave of pressure changes that propagates through the medium. These pressure waves can be detected by our ears and perceived as sound.

The characteristics of sound waves include frequency, wavelength, amplitude, and velocity. Frequency refers to the number of cycles of the wave that occur per second and is measured in Hertz (Hz). Wavelength refers to the distance between two consecutive points in a wave that are in phase with each other. Amplitude refers to the maximum displacement of the particles from their equilibrium position and is related to the loudness of the sound. Velocity refers to the speed at which the wave travels through the medium and is dependent on the properties of the medium, such as its density and stiffness.

Sound waves are used in many applications, including communication, music, medical imaging, and sonar.

Here  in the question,

Woodworking machines produce a sound level of 90 decibels, which is considered to be hazardous to hearing with prolonged exposure. Librarians, teachers, and truck drivers are not listed as noise sources in the table and their risk of sound damage would depend on their specific work environment and exposure to noise.

Therefore, According to the data table, the profession with the highest risk of ear damage is likely to be woodworker.

To learn more about frequency click:

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Answer:

The force, exerted by Big Ben on the Empire State Building is 2.66972 × 10⁻⁷ N

Explanation:

The question relates to the force of gravity experienced between two bodies

The given parameters are;

The mass of Big Ben, M₁ = 1 × 10⁸ kg

The mass of the Empire State Building, M₂ = 1 × 10⁹ kg

The distance between the two Big Ben and the Empire State Building, r = 5,000,000 meters

By Newton's Law of gravitation, we have;

[tex]F=G \times \dfrac{M_{1} \times M_{2}}{r^{2}}[/tex]

Where;

F = The force exerted by Big Ben on the Empire State Building and vice versa

G = The universal gravitational constant = 6.67430 × 10⁻¹¹ N·m²/kg²

M₁, M₂, and r are the given parameters

By plugging in the values of the parameters and the constant into the equation for Newton's Law of gravitation, we have;

[tex]F=6.67430 \times 10^{-11} \times \dfrac{1 \times 10^8 \times 1 \times 10^9}{(5,000,000)^{2}} = 2.66972 \times 10^{-7}[/tex]

The force, 'F', exerted by Big Ben on the Empire State Building is F = 2.66972 × 10⁻⁷ N.

Answer:

Given

mass (m) =5kg

velocity (v) =6m/s

momentum (p) =?

Form

p=mv

5kgx6m/s

p=30kg.m/s

momentum =30kg.m/s

Answer:

w1:w2 = 16:1

Explanation:

As we know that ration of amplitude is equal to

[tex]\frac{a_1}{a_2} = \sqrt{\frac{w_1}{w_2} }[/tex]

here w1 and w2 are the widths of the slit.

[tex]\frac{I _{min}}{I_{max}} = \frac{(a_1-a_2)^2}{(a_1+a_2)^2} \\\frac{9}{25} = \frac{(1-\frac{a_2}{a_1} )^2}{(1+\frac{a_2}{a_1} )^2} \\\frac{3}{5} = \frac{(1-\frac{a_2}{a_1} )}{(1+\frac{a_2}{a_1} )}\\8 \frac{a_2}{a_1} = 2\\\frac{a_1}{a_2} = 4[/tex]

Again

[tex]\frac{a_1}{a_2} = \sqrt{\frac{w_1}{w_2} }[/tex]

[tex]4 = \sqrt{\frac{w_1}{w_2} }\\\frac{w_1}{w_2} = 16[/tex]

w1:w2 = 16:1

Answer:

The calculation and explanation is given below:

Explanation:

a) Here the forces represent that there are parachutist weight and the parachute G also the force of air resistance.

b) As the displacement would be made in HRM so the weight and Air resistance force would be equivalent in the opposite way

G = mg

= 110 × 10

= 1100N  

Fr = 1100N

Answer:

           W ’= 21.78 kg

Explanation:

The expression for weight is

          W = m g

let's look for the acceleration of gravity with the universal law of gravitation

          F = G m M / r2

          F = m (G M / r2)

without comparing the two equations

          g’= G M / r2

in that case M = 2 Mo and r = 3 ro

where mo and ro are the mass and radius of the earth

         we substitute

         g ’= G 2Mo / (3r₀) 2

         G ’= 2/9 G Mo / r₀²

         g ’= 2/9 g

the weight of the body on this planet is

         W ’= m g’

          W ’= m 2/9 g

let's calculate

          W ’= 2/9 10 9.8

           W ’= 21.78 kg

Answer:

Potential Energy = 147Joules

KE = 490Joules

Explanation:

1) Potential Energy = mgh

Mass m = 50kg

g = 9.8m/s^2

height h = 3.0m

Potential = 50*9.8*3

Potential Energy = 147Joules

2) KE = 1/mv^2

Get the velocity

v² = u²+2gh

v² = 0²+2(9.8)(1.0)

v² = 19.6

v = √19.6

v = 4.43m/s

KE = 1/2 * 50 *4.43²

KE = 25 * 19.6

KE = 490Joules

Hence the kinetic energy is 490Joules

(a) The potential energy of the can when it is  at the top of the ladder is 1470 J.

(b) The kinetic energy of the can when it is  1.0 meter above the floor is 488.41 J.

Given data:

The mass of the person is, m = 50 kg.

The weight carried by the person is, W = 20 N.

The vertical height of ladder is, h = 3.0 m.

(a)

The energy possessed by an object by virtue of its position is called potential energy. The expression for the potential energy is given as,

[tex]PE = mgh[/tex]

here, g is the gravitational acceleration.

Solving as,

[tex]PE = 50 \times 9.8 \times 3.0\\\\PE = 1470 \;\rm J[/tex]

Thus, the potential energy of the can when it is  at the top of the ladder is 1470 J.

(b)

And the kinetic energy is the energy of object by virtue of motion. And its expression is,

[tex]KE = \dfrac{1}{2} mv^{2}[/tex]

Here, v is the velocity of can.

Now, at 1 m height, its velocity is calculated as,

[tex]v^{2}=u^{2}+2gh\\\\v^{2}=0^{2}+2 \times 9.8 \times 1.0\\\\v = \sqrt{2 \times 9.8 \times 1} \\\\v=4.42 \;\rm m/s[/tex]

So, the kinetic energy is calculated as,

[tex]KE = \dfrac{1}{2} \times 50 \times (4.42)^{2}\\\\KE = 488.41 \;\rm J[/tex]

Thus, we can conclude that the kinetic energy of the can when it is  1.0 meter above the floor is 488.41 J.

Learn more about the kinetic energy here:

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Answer:

An estimate for the time it will take for a spacecraft to travel from Earth to Mars is approximately 138.8 days

Explanation:

The distance between Earth and the Moon = 684,400 km

The distance between Earth and Mars = 220.58 × 10⁶ km

The distance between Earth and Pluto = 5.2241 × 10⁹ km

The ratio of the distance between Earth and Pluto and the distance between Earth and Mars = (5.2241 × 10⁹ km)/(220.58 × 10⁶ km) ≈ 23.683

It took 2006 to 2015 (9 years) to travel from Earth to Pluto, therefore, it can take approximately (9 years)/(23.683) ≈ 0.38 of a year which is ((9 years)/(23.683)) × 365.2422 ≈ 138.8 days for a spacecraft to travel from Earth to Mars

Answer:

rubber

Explanation: because its the only insulator

Answer:

Forces make things speed up (or accelerate). When a force pushes or pulls the object, the object will move in the direction of the force. The bigger the force, and the lighter the object, the greater the acceleration.

Explanation:

1) The radiations are associated with both electric and magnetic field is called "Electromagnetic radiation".

4) IR rays, Alpha rays, Beta rays.