I need to find the total mechanical energy. I think the first one is correct but the second one is wrong

Explanation:Example

A 500 W television set is switched on for 4 hours. Calculate the energy transferred.

500 W = 500/1000 = 0.5 kW

energy transferred = power × time

= 0.5 × 4

= 2 kWh

A lamp is connected to a 230 V mains supply. A current of 4 A flows through the lamp for 30 seconds. The energy dissipated is 27600 J.

To find the energy dissipation, the given values are,

Voltage, V = 230 V

Current, I = 4 A

time, t = 30 s

What is energy?

The forms of energy, which prevail, however, all these forms of energy generally come under two basic categories, that is, potential energy and kinetic energy.  

The stored energy and the energy of position are termed potential energy. The motion of waves, molecules, electrons, atoms, and objects is termed kinetic energy.  

The different forms of potential energy are chemical energy, mechanical energy, gravitational energy, and nuclear energy. The different forms of kinetic energy are thermal energy, radiant energy, motion energy, sound, and electrical energy.  

Substituting the given values,

The energy is given by

E = V I t

E = 230 x 4 x 30

E = 27600 J

Thus, the energy dissipated is 27600 J.

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F₂ = 1.723 x 10⁸ N

Given

Area of small piston : 0.004 m²

Area of large piston : 3.5 m²

Force 225 N

Required

Force applied

Solution

Pascal Law :

F₁/A₁=F₂/A₂

225/0.004 m² = F₂/3.5² m²

F₂ = 1.723 x 10⁸ N

Answer:

1. battery is capable of continuous current, capacitor is not

2. battery maintains a potential, capacitor does not

3. battery stores chemical energy, capacitor stores electric energy

Explanation:

1. battery is capable of continuous current, capacitor is not

This is because the battery maintains a constant current throughout while the capacitor maintains an exponential decaying current.

2. battery maintains a potential, capacitor does not

This is because, the battery has a potential at its terminal due to its emf whereas, the capacitor needs a potential to be applied to its terminals.

3. battery stores chemical energy, capacitor stores electric energy

This is because, the battery converts chemical energy to electrical energy whereas, the capacitor stores electric energy due to its ability to store electric charge.

Answer

battery stores chemical energy, capacitor stores electric energy

battery maintains a potential, capacitor does not

battery is capable of continuous current, capacitor is not

Explanation:

Answer:

the mechanical advantage David had when using the pulley is 2.

Explanation:

Given;

load moved by David, L = 350 N

effort applied by David, E = 175 N

The mechanical advantage David had when using the pulley is calculated as;

[tex]M.A = \frac{Load}{Effort} \\\\M.A = \frac{350}{175} \\\\M.A = 2[/tex]

Therefore, the mechanical advantage David had when using the pulley is 2.

Answer:I think that is false

Explanation:

Answer:

We conclude that the quantity of  the charge that flows through the wire in 50 s will be 45 C.

Explanation:

Given

To determine

We need to find the quantity of  the charge that flows through the wire in 50 s.

Important Tip:

A current of 1 Ampere = 1 Coulomb  of charge flowing in 1 second

Using the formula involving charge and current

[tex]I=\frac{Q}{t}[/tex]

where:

now substituting I = 0.9 and t = 50 in the formula

[tex]I=\frac{Q}{t}[/tex]

[tex]0.9\:=\:\frac{Q}{50}[/tex]

switch sides

[tex]\frac{Q}{50}=0.9[/tex]

Multiply both sides by 50

[tex]\frac{50Q}{50}=0.9\cdot \:50[/tex]

Simplify

[tex]Q=45[/tex] C

Therefore, we conclude that the quantity of  the charge that flows through the wire in 50 s will be 45 C.

Answer:

40 mph

Explanation:

pls mark as brainliest

Answer:

No. ... UV light causes sunburn, whereas visible light does not.

Explanation:

The light energy produced from a light bulb is far low compared to the light energy produced by the sun. The heat energy also greatly differ in both.

Light energy is a form of energy produced by stars and man made devices. One form of energy can be transformed into other form without destroying the energy.

The source of light and heat energy in stars is nuclear fusion. Fusing of two light nuclei forming a heavy nuclei accompanies the release of tremendous amount of energy.

In a light bulb, the electrical energy is converted to light energy and some energy is lost in the form of heat energy. The light the white light produced by a bulb cannot be as intense as the white lite from sun.

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Answer:

The gravitational potential energy of that rock is 174371.4 J.

Explanation:

Given

To determine

We need to find the gravitational potential energy of the rock

We know that the potential energy of a body is termed as the stored energy due to its position.

One kind of energy comes from Earth's gravity — Gravitational potential energy (GPE).

Gravitational potential energy (GPE) can be determined using the formula

[tex]GPE = mgh[/tex]

where

now substituting m = 59.31, h = 300 and g = 9.8

[tex]GPE = mgh[/tex]

         [tex]=59.31\times 9.8\times 300[/tex]

         [tex]=174371.4[/tex] J

Therefore, the gravitational potential energy of that rock is 174371.4 J.

If the earth didn't have an atmosphere, we wouldn't be able to breathe. So, option B.

The atmosphere serves as a blanket, maintaining Earth's normal temperature. All of the gases required to support life on Earth are present in it. The ozone layer in the atmosphere shields the Earth from dangerous UV radiation.

Infrared radiation from the earth is reflected back to the surface by the lowest layers of the atmosphere. The atmosphere effectively traps the thermal radiation that the planet receives from the sun throughout the day.

The surface of the world would become too cold to support life if the atmosphere weren't present.

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Answer:

Longitudinal wave

Explanation:

Mechanical longitudinal waves are also called compressional or compression waves, because they produce compression and rarefaction when traveling through a medium, and pressure waves, because they produce increases and decreases in pressure.

Answer:

we can predict where they are in the future, know where they were in the past

can also build a device that generates a specific type of desired movement,

Explanation:

With the knowledge of the laws that govern the movement of bodies, we can predict where they are in the future and therefore know if there may be an accident, crash.

We can also know where they were in the past and therefore know if a fact is the result of these movements, craters, collapse of buildings, etc.

We can also build a device that generates a specific type of desired movement, for example pulleys that help us with work, etc.

Answer:

350 J of energy is transferred by radiation.

Explanation:

Given that,

600 J of energy is transferred from the chemical  store in the battery to the thermal store of surroundings.

Heat energy = 250 J

Sound energy = x

According to the conservation of energy,

600 = 250 +x

x = 600-250

x = 350 J

So, 350 J of energy is transferred by radiation.

Answer:

The answer is D. Sound

Explanation:

Answer:

D

Explanation:

this is simple, because when air is removed, means that there is no particles in the jar so vacuum is achieved, and when you can't hear a sound means that the sound couldn't travel through the vacuum. which means that sound cannot travel through vacuum,

as a result, sound requires a medium ( air) travel from one point to another.

hope it helps, if not please report it so that someone else gets to try it

Answer:

it g hope it helps you out

Answer:

momentum

Explanation:

The final temperature of the water : 60°C

Given

100 g water

t = 90 °C and 30 °C

Required

The final temperature

Solution

Q in = Q out

Q cold water = Q warm water

100 x 4.184 x (90-t)=100 x 4.184 x (t-30)

418.4(90-t)=418.4(t-30)

37656-418.4t=418.4t-12552

50208=836.8t

t = 60°C

Answer:

19.6133 newton.

...?.......

-solar energy into electrical energy inside solar panels

-during photosynthesis, solar energy is converted into chemical energy

Given :

A solution contained 0.05g of sodium hydroxide in 25 cm3 of water.

To Find :

The concentration of the solution in g/dm³.

Solution :

We know, 1 cm = 0.1 dm

So, 1 cm³ = 0.001 dm³

Now, 25 cm³ = 25 × 0.001 dm³

25 cm³ = 0.025 dm³

Now, concentration of the solution in g/dm³ is [tex]\dfrac{0.05\ g}{0.025\ dm^3} = 2 \ g/dm^3[/tex].

Therefore, the concentration of the solution is  2 g/dm³.

Answer:

Cycloheptatriene

Explanation:

Answer:

Cycloheptatriene or Toluene

Explanation:

I hope this helps!

Answer:

v = 9.34 m/s

Explanation:

Given that,

The distance between crests, [tex]\lambda=14\ m[/tex]

The vertical distance from trough to crest = 3.6 m

Time taken, t = 1.5 s

The amplitude of wave = vertical distance from trough to crest /2

= 3.6/2

= 1.8 m

The speed of the wave is given by :

[tex]v=f\times \lambda\\\\=\dfrac{\lambda}{T}\\\\=\dfrac{14}{1.5}\\\\=9.34\ m/s[/tex]

So, the speed of the wave is 9.34 m/s.

Answer:

Explanation:

Find the final velocity at which it struck the ground by using the kinetic energy formula.

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

[tex]2000=\frac{1}{2} (15)v^2\\v=16.33[/tex]

Now use kinematics to solve for the vertical displacement. We were given the initial velocity and acceleration can be assumed to be 9.8

[tex]V^2=V^2_i+2a(y_f-y_i)\\16.33^2=0^2+2(9.8)(y_f-y_i)[/tex]

Δy = 13.6 meters

Answer:

All the planets would be remain in place and orbit in darkness

Explanation:

I'm assuming the sun didn't go nova, but it would sure kill off all life on Earth!

Have a great weekend!

Answer:

A- did this test :P

Explanation: