# 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

QUESTION POSTED 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.

Wind energy to sound energy

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

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

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

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

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

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.

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. inhibitor

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

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

Work Done = 45N x 4.6m = 207J

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

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

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

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 solar energy

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

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

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 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**

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

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

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

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

D is right but c fits as well

ANSWERED AT 17/10/2019 - 05:45 AM

QUESTION POSTED AT 17/10/2019 - 05:45 AM

C applies to both types of propagation

ANSWERED AT 17/10/2019 - 05:45 AM

QUESTION POSTED AT 17/10/2019 - 05:45 AM

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

**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

I would say A) a vibration that carries energy

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

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

**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 :**

where,

= electric potential difference

= 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.

**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

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

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

**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

Renewable resources are things that can be naturally replaced in a short period of time.

Such as: Wind

Fossil fuels are considered a non-renewable resource because it takes 500 million years for reserves to form.

Such as: Wind

Fossil fuels are considered a non-renewable resource because it takes 500 million years for reserves to form.

ANSWERED AT 17/10/2019 - 04:48 AM

QUESTION POSTED AT 17/10/2019 - 04:48 AM

**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

**Kinetic energy is conserved:**

Before collision and after collision

**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

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

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.

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

The answer is A sorry I'm late

ANSWERED AT 17/10/2019 - 04:11 AM

QUESTION POSTED AT 17/10/2019 - 04:11 AM

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

**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

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