What is the potential energy of an 81kg skier on a lift that has raised him 10m above the ground?

QUESTION POSTED AT 10/10/2019 - 09:38 AM

Answered by answersmine AT 10/10/2019 - 09:38 AM

The formula for potential energy is mass x acceleration which is always 10m/s square x height so the answer is 81 x 10 x 10 = 8100 joules.
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Which energy transfer occurs when a person blows a whistle

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ANSWERED AT 17/10/2019 - 09:25 AM


QUESTION POSTED AT 17/10/2019 - 09:25 AM

It is possible to hang from a bare power line and not get electrocuted as long as you are not touching the ground, or any conductor that is touching the ground.

Yes i believe so. depending on the covering of the line and other environmental confounding variables 

ANSWERED AT 17/10/2019 - 09:00 AM


QUESTION POSTED AT 17/10/2019 - 09:00 AM

Which type of climate receives the most intense solar energy? A. grasslands climate B. polar climate C. temperate climate D. tropical climate

The answer to your question is D. Tropical Climate. This is because tropical rainforests (or the climate it's self) are/is more likely to be located near the equator where the sun gives off direct solar energy.

ANSWERED AT 17/10/2019 - 08:49 AM


QUESTION POSTED AT 17/10/2019 - 08:49 AM

A 200.0 kg block of a substance requires 3.59 kj of heat to raise its temperature by 20.0 k. what is the specific heat of the substance? PLEASE HELP ASAP 23 POINTS!

Specific heat capacity = (1/200) x (3590/20) = 0.8975Jkg^-1K^-1= 0.898Jkg^-1K^-1

ANSWERED AT 17/10/2019 - 08:41 AM


QUESTION POSTED AT 17/10/2019 - 08:41 AM

A 0.0100-kilogram grape hangs from a vine 1.50 meters from the ground. What is the potential energy of the grape?

The potential energy is defined as Ep=m*g*h where m is the mass of the body, g=9.81 m/s² and h is the height of the body. In our case m=0.01 kg and h=1.5 m. So when we input the values into the equation:

Ep=0.01*9.81*1.5= 0.14715 J. 

So the potential energy of a grape is Ep=0.14715 J. 

ANSWERED AT 17/10/2019 - 08:20 AM


QUESTION POSTED AT 17/10/2019 - 08:20 AM

A(n) ___ keeps a reaction from occurring by increasing the activation energy required for a reaction to occur. A. inhibitor B. catalyst C. stopper D. synthesis

A. inhibitor

think about what inhibit means, it means to keep something from happening.

ANSWERED AT 17/10/2019 - 08:09 AM


QUESTION POSTED AT 17/10/2019 - 08:09 AM

How much work is done by the force of gravity when a 45 N object falls to the ground from a height of 4.6 m?

Work Done = 45N x 4.6m = 207J

ANSWERED AT 17/10/2019 - 08:03 AM


QUESTION POSTED AT 17/10/2019 - 08:03 AM

A 261 kg motorcycle moves with a velocity of 4 m/s. What is its kinetic energy? Joules

K. E. =mv^2/2=((261kg)(4)^2)/2=2088J

ANSWERED AT 17/10/2019 - 07:47 AM


QUESTION POSTED AT 17/10/2019 - 07:47 AM

Briefly describe how the Sun produces energy. plz and thank you :)

The Sun produces energy by the process of nuclear fusion. Nuclear fusion occurs when lighter nuclei combine to produce a larger, heavier nucleus. Energy is released during nuclear fusion. Nuclear fusion requires very high temperatures and pressures. Nuclear fusion occurs in the core of the Sun when hydrogen atoms combine to form helium atoms.

ANSWERED AT 17/10/2019 - 07:23 AM


QUESTION POSTED AT 17/10/2019 - 07:23 AM

Energy from the sun is _energy

Energy from the sun is solar energy

ANSWERED AT 17/10/2019 - 07:12 AM


QUESTION POSTED AT 17/10/2019 - 07:12 AM

What energy transformation takes place when you bounce a basket ball to another person. List 7 forms of energy, 3 should be on mechanical. HELP 17 POINTS!!

Physical it would be physical because someone have to be there to do it

ANSWERED AT 17/10/2019 - 07:06 AM


QUESTION POSTED AT 17/10/2019 - 07:06 AM

The wavelength of the characteristic, bright yellow-orange flame test color of sodium is 590 nm. calculate the average energy (?e associated with this atomic emission line.

The energy of a photon or a light is calculated from the product of the Planck's constant and the frequency of the light. We can calculate the frequency from the wavelength since they are related. We do as follows:

E = hv

where h is Plank's constant (6.63× 10^-34 m^2 kg / s)
             v is frequency and equal to speed of light/wavelength (c/w)

We can rewrite energy as follows:

E = hc/w = 6.63× 10^-34 (3x10^8) / 590x10^-9
E= 3.37x10^-19 J

ANSWERED AT 17/10/2019 - 06:29 AM


QUESTION POSTED AT 17/10/2019 - 06:29 AM

Do you think energy can be “used up?” Why or why not?

I dint think energy can be used up because energy cant be created nor destroyed

ANSWERED AT 17/10/2019 - 05:47 AM


QUESTION POSTED AT 17/10/2019 - 05:47 AM

A pendulum has 366 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing?

366J.  Energy is conserved and is transformed from completely potential energy at the top to completely kinetic at the bottom.

ANSWERED AT 17/10/2019 - 05:44 AM


QUESTION POSTED AT 17/10/2019 - 05:44 AM

Which statement relates most directly to the second law? 1 - Thermal energy is conserved. 2 - Some thermal energy is lost and some is used to do work. 3 - Thermal energy flows from areas of higher to lower temperatures. 4 - Thermal energy can be transferred and transformed.

Answer: Option (2) is the correct answer.

Explanation:

According to second law of thermodynamics, all the energy of a system cannot be converted into useful work because some amount of energy will be lost.

For example, a machine will never convert its energy into 100% work as some of the energy of machine will be lost into the atmosphere.

Therefore, we can conclude that the statement some thermal energy is lost and some is used to do work, relates most directly to the second law.

ANSWERED AT 17/10/2019 - 05:18 AM


QUESTION POSTED AT 17/10/2019 - 05:18 AM

A proton is moved so that its electric potential energy increases from 2.0 × 10-18 J to 6.0 × 10-18 J. The magnitude of the charge on a proton is 1.602 × 10-19 C. The electric potential difference through which the proton moved, to the nearest whole number, is _______V

Answer : The electric potential difference through which the proton moved, to the nearest whole number is, 25 V

Solution :

Potential difference : It is defined as the work done by the unit charge.

Formula used :

\Delta V=\frac{\Delta E}{q}

where,

\Delta V = electric potential difference

\Delta E = electric potential energy

q = charge on  proton

Now put all the given values in the above formula, we get the value of electric potential difference.

\Delta V=\frac{\Delta E}{q}=\frac{(6\times 10^{-18}-2\times 10^{-18})J}{1.602\times 10^{-19}C}=24.968V=25V

Therefore, the electric potential difference through which the proton moved, to the nearest whole number is, 25 V

ANSWERED AT 17/10/2019 - 05:15 AM


QUESTION POSTED AT 17/10/2019 - 05:15 AM

An object with a kinetic energy of 2160J has a mass of 120kg. What is the velocity

Hmmm the only formula i know is v = d * t  or volocity = distance * time

ANSWERED AT 17/10/2019 - 05:14 AM


QUESTION POSTED AT 17/10/2019 - 05:14 AM

Which electron transition between the energy levels of hydrogen causes the emission of a photon of visible light?

Hydrogen is the simplest chemical element, consisting of a single proton and single electron. The electron can be excited in higher energy states and upon relaxation will emit electromagnetic radiation. It is the Balmer series of energy levels (n=5 to n=2) that leads to the emission of visible (violet) light. 

ANSWERED AT 17/10/2019 - 05:07 AM


QUESTION POSTED AT 17/10/2019 - 05:07 AM

Which statement best describes what energy transfer diagrams show? Energy can change form, but the total amount of energy stays the same. Every energy transformation results in a reduction of energy. Energy transformations result in fewer types of energy. Each type of energy can change into one other type of energy.

The correct answer to the question is : A) Energy can change form, but the total amount of energy stays the same.

EXPLANATION:

Before answering this question, first we have to understand law of conservation of energy.

As per law of conservation of energy, the energy can neither be created nor be destroyed. It only changes from one system to another system, and the total energy of an isolated system is always constant.

The energy transfer diagram is based on this law.

Hence, the best description about energy transfer diagram will be that energy can change form, but the total amount of energy stays the same.

ANSWERED AT 17/10/2019 - 04:52 AM


QUESTION POSTED AT 17/10/2019 - 04:52 AM

Which statement is true for an elastic collision in two dimensions? Kinetic energy is not conserved. Momentum is not conserved. Only momentum is conserved. Kinetic energy and momentum are conserved.

Answer:

Kinetic energy and momentum are conserved this statement is true for an elastic collision in two dimensions.

d is correct

Explanation:

Elastic collision :

Elastic collision in two dimensions follows same rules as a collision in one dimension.

In elastic collision, The kinetic energy and momentum are same before and after collision it means momentum and kinetic energy are conserved.

Momentum is conserved :

Before collision and after collision

m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2}

Kinetic energy is conserved:

Before collision and after collision

\dfrac{1}{2}m_{1}u_{1}^{2}+\dfrac{1}{2}m_{2}u_{2}^{2}=\dfrac{1}{2}m_{2}v_{1}^{2}+\dfrac{1}{2}m_{2}v_{2}^{2}

In inelastic collision :

In inelastic collision, The momentum is conserved but energy not conserved.

Hence, Kinetic energy and momentum are conserved this statement is true for an elastic collision in two dimensions.

ANSWERED AT 17/10/2019 - 04:46 AM


QUESTION POSTED AT 17/10/2019 - 04:46 AM

What is the difference between an energy source and an energy resource?

An energy resource is something that can produce heat, power life, move objects, or produce electricity. An energy source is a system which makes energy in a certain way 

ANSWERED AT 17/10/2019 - 04:40 AM


QUESTION POSTED AT 17/10/2019 - 04:40 AM

A parallel-plate capacitor having circular plates of radius R and separation d is held at a fixed potential difference by a battery. If the plates are moved closer together while they are held at the same potential difference a. the amount of charge on each of them will increase. b. the amount of charge on each of them will decrease. c. the amount of charge on each of them will stay the same. d. the energy stored in the capacitor increases.

C= relative permittivity X permittivity of free space X a/d 

Q= C/V (where Q is charge and V is voltage)

Since C  increases so does the amount of charge on the plates. The stored energy also increases because E= 1/2 CV^2

A and D are correct.

ANSWERED AT 17/10/2019 - 04:40 AM


QUESTION POSTED AT 17/10/2019 - 04:40 AM

Why are energy pyramids usually no more than 4 trophic levels?

There are usually no more than four trophic levels, because of the huge loss of energy at each trophic levels. Alomost 10 percent of the energy is lost at each level, as compared to the previous level, which occurs due to wastage of materials like bones and leftover tissues. So, till the fourth trophic level, very less energy is left to be continued to another level, and thus the process is like that.

ANSWERED AT 17/10/2019 - 03:48 AM


QUESTION POSTED AT 17/10/2019 - 03:48 AM

What is the total energy released when 9.11 x10^-31 ki?

Answer:

(x^10)(x^2) Add the exponents 10+2=12 So... (x^12)

Explanation:

ANSWERED AT 17/10/2019 - 03:37 AM


QUESTION POSTED AT 17/10/2019 - 03:37 AM

A leaf falls from a tree. As you are watching the leaf fall, how can you tell that it has reached its terminal velocity? A. The leaf is accelerating. B. The leaf hits the ground. C. The leaf is experiencing a force. D. The leaf is falling with a constant velocity.

You can tell that it has reached its terminal velocity when D) the leaf is falling with a constant velocity as you are watching the leaf fall. The terminal velocity is a point of condition when an object's speed equalize the force of gravity. The terminal velocity condition could occur if there is no acceleration to the object's speed.

ANSWERED AT 17/10/2019 - 03:30 AM


QUESTION POSTED AT 17/10/2019 - 03:30 AM