If something is 50% efficient, how many joules of wasted energy will there be if 750J of energy is put in?

The density of the block is mathematically given as

[tex]\phi=8e-4[/tex]

Question Parameters:

50 cm by 100 cm by 200 cm has a mass of 8000 g.

Density is simply defined as the mass per unit volume of a material or substance

where

Volume and Mass are factors of density

Generally the equation for the density  is mathematically given as

[tex]phi=\frac{m}{v}[/tex]

Where

v= 50 cm * 100 cm * 200 cm

v=1000000cm

v=10000m

Therefore

[tex]phi=\frac{m}{v}\\\\phi=\frac{8}{10000}[/tex]

phi=8e-4

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Answer:

By applying relative small force to the smaller piston

Explanation:

If a car sits on top of the large piston, it can be lifted by applying a relatively small force to the smaller piston, the ratio of the forces being equal to the ratio of the areas of the pistons

Answer:

Since energy means capacity to do work, when stone is in ground level, it has 0 work because it doesn't covered any distance but when stone lifted at a certain height , it covered a certain distance and work is done. Thus same stone has energy when it is lifted at a height .

Explanation:

Answer:

Only if that object is being moved while carried

Explanation:

Work = Force • distance travelled

While holding an object would need force equal to that objects mass multiplied by 9.8, if it hasn't moved, then no work is done.

if you were to carry the object and have it travel some distance, then work would be done on that object.

Answer:

1N

Explanation:

F=ke

k=10N/m

e=0.1m

F=10*0.1

F=1N

Answer:

The half-life of a radioactive isotope is the time taken for half the unstable nuclei in a sample to decay.

Answer:

188 J

Explanation:

W = F * d * cosα

Now F = 100 N, d = 2.0 m, α = 20.0°

so

W = 100 * 2.0 * cos(20) = 188 J

An ohmic resistor is a resistor that obeys Ohm's law V = IR (voltage = current x resistance). Therefore, if the voltage in such element is increased by n number of times, by the same number n has to increase the current.

[tex] \\ [/tex]

hope it helps:)

Ohmic resistors are materials that obeys ohms law.

An ohmic resistor is a material that obey's ohms law. This material does not allow passage of electricity through it.

V = IR

where;

Thus, ohmic resistors are materials that obeys ohms law.

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Inertia refers to the tendency of a body to resist changes.

It is the property of a body to resist change.

A moving body will continue moving until a force acts on it. Unless the acting force is big enough to overcome the inertia of the body, the body will continue moving.

Also, a body at rest will continue resting unless a force big enough to overcome the inertia force is used to displace it.

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Answer:

inertia, property of a body by virtue of which it opposes any agency that attempts to put it in motion or, if it is moving, to change the magnitude or direction of its velocity. Inertia is a passive property and does not enable a body to do anything except oppose such active agents as forces and torques.

Answer:

Yes, it can be destroyed.The total amount of matter (atoms) before and after a chemical reaction (change), remains the same.

Explanation:

hope this helps

Answer:

a reflected sound wave completely bounces off an object and diffraction occurs when there is an opening in a wall and only the waves that can fit through the wall go and then the waves start to expand again after going through the hole.

Explanation:

W= mg × d × cosx

W= 12 × 10 × 2.2 × (-1)= -264 J

I hope it helps you

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Answer:

so two people can understand each other when presenting new ideas to each other

Explanation:

Answer:

Motion must be defined relative to something.

Explanation:

Basically, the motion of an object will vary according to the observer. And because motion is independent of the frame of reference, the frame of reference must be defined. I hope that makes sense. :)

Answer:

space

Explanation:

I got it right on E d i n u i t y

A space telescope called the Hubble was put into low-Earth orbit. Therefore, Hubble telescope is located in space.

A space telescope called the Hubble was put into low-Earth orbit around 1990 and continues to be in use today. Although it wasn't the initial space telescope, it is one of the biggest and most useful ones. It is famous for being both an essential scientific instrument and a public relations success for astronomy.

One of NASA's Big Observatories, the Hubble telescope being dedicated after astronomer Edwin Hubble. Hubble's targets are chosen by the Space Telescope Scientific Institute, which also handles the data processing, while the spacecraft is managed by the Goddard Space Flight Center at NASA. Hubble telescope is located in space.

Therefore, Hubble telescope is located in space.

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Answer:

The relative velocity {\displaystyle {\vec {v}}_{B\mid A}} is the velocity of an object or observer B in the rest frame of another object or observer A.

Answer:

The relative velocity is defined as the velocity of an object with respect to another observer. It is the time rate of change of relative position of one object with respect to another object.

Answer:

umm section 2 and 4

Explanation:

because at section 2 it starts and at section 4 it moves again and stops at 3.

Answer:

A hypothesis predicts the value of a dependent variable given an independent variable:

If a person weighs 50 kg (independent variable) the weight hypothesis predicts that W = 50 * 9.8 = 490 N (the dependent variable)

So those three should be present in an investigation

The amount of work done by the fork-lift truck in lifting the crate is 2,195.2 Joules.

Given the following data:

Scientific data:

To calculate the amount of work done by the fork-lift truck in lifting the crate:

In Science, work done is generally calculated by multiplying force and the vertical distance or displacement experienced by an object.

Mathematically, work done is given by the formula:

[tex]Work\;done = force \times displacement = mgh[/tex]

Substituting the given parameters into the formula, we have;

[tex]Work\;done = 64 \times 9.8 \times 3.5[/tex]

Work done = 2,195.2 Joules.

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Answer:

B 7.5mph/s

Explanation:

use change in y/ change in x

________________________________

Answer with explanation

a) Formula to find the current that passes through a circuit is :

Given that,

Voltage = 45V

Resistance = 39Ω

Current =?

Let us find it now.

V = I × R

45V = I × 39Ω

Divide both sides by 39.

1.153A = I = Current

b) Formula to find the energy is:

            = 45V × 1.153A × ( 5 × 60)s

            = 15565.5 J

            = 15.5655kJ

Answer:

the layers of atmosphere are heated through radiation and convection.

Explanation:

Answer:

Hi, Im Jenna! Here is ur ansswer Pls mark as braijnliest

Explanation:

solution.

The formula for linear expansivity is

α = (If – If) / If (0f – 0i ) is used to determine the linear expansivity

If – final length,

I – initial length

0f – final tempt.

0i – initial tempt.

(b) (ii)

I = 3 m

0 = 29oC

02 = 41oC

α = 1.0 x 10 k-1

using safety gap = change in length

Δ l = α I Δ Θ

1 x I0-5 x 3.0 x (41 – 29) = 3.6 x 10-3 m = 0.0036

Answer:

I believe the answer is 45

Let's see why g is 0 at centre of earth

[tex]\\ \rm\rightarrowtail g\propto \dfrac{1}{h}[/tex]

Means g is indirectly proportional to height of object.

At centre h=0

And at centre the distance from top of earth surface is equal in opposite directions from centre.

So

[tex]\\ \rm\rightarrowtail F_{net}=0[/tex]

Hello! Answer is below.

The center of the earth has no gravity, at all, since its pulling on you in all other directions (hints to why you can float if you were in a room/ spaceship, since there are so many massive objects).Gravity pulls us because there are massive objects that exert a gravitational force on everything around them. The further away the object is, the weaker the force is. For exapmple, if all those massive objects dissapeared, we would be able to walk freely. Meaning,we could walk the way we do on earth.

Hope this helps.

-Natalia.

Answer:

A and B

Explanation:

got it right

Answer:

Is there a target date for the hiring decision?

What is your preferred method for follow-up contact?

Answer:

The freezer compartment is at the top of a fridge because cool air sinks. (convection current)

Explanation:

Answer:

[tex]2 \: cm[/tex]

Explanation:

Total diameter:

[tex]12 - 4 = 8 \: cm[/tex]

Diameter of 1 ball:

[tex] \frac{8}{4} = 2 \: cm[/tex]