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evablogger [386]
3 years ago
8

a .1-kilogram ball rolls across the floor at a speed of 2 meters per second. Another .1 kilogram ball rests on a shelf 1 meter a

bove the floor. Which ball has more energy?
Physics
1 answer:
JulsSmile [24]3 years ago
6 0
First, we need to fight the weight of the balls instead of their mass.  We do this by multiplying their weight it kg by 9.8.  This gives us .98 N.  To find the potential energy of the rolling ball, we find its kinetic energy.  The formula for this is KE=mass*velocity^2*1/2.  

Plugging in our numbers, we have Kinetic energy = .1 * 1^2*1/2 which gives us .05 joules.

Now we find the potential energy of the ball on the shelf.  For this we do:

Potential energy = .1*9.8*1, and our answer is .98 joules.  Clearly, the ball on the shelf has more energy.
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1.9 km converted to miles
Snowcat [4.5K]
When you convet km to miles this is what you get 

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7 0
3 years ago
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectiv
lys-0071 [83]

Answer:

The ratio of T2 to T1 is 1.0

Explanation:

The gravitational force exerted on each sphere by the sun is inversely proporational to the square of the distance between the sun and each of the spheres.

Provided that the two spheres have the same radius r, the pressure of solar radiation too, is inversely proportional to the square of the distance of each sphere from the sun.

Let F₁ and F₂ = gravitational force of the sun on the first and second sphere respectively

P₁ and P₂ = Pressure of solar radiation on the first and second sphere respectively

M = mass of the Sun

m = mass of the spheres, equal masses.

For the first sphere that is distance R from the sun.

F₁ = (GmM/R²)

P₁ = (k/R²)

T₁ = (F₁/P₁) = (GmM/k)

For the second sphere that is at a distance 2R from the sun

F₂ = [GmM/(2R)²] = (GmM/4R²)

P₂ = [k/(2R)²] = (k/4R²)

T₂ = (F₂/P₂) = (GmM/k)

(T₁/T₂) = (GmM/k) ÷ (GmM/k) = 1.0

Hope this Helps!!!

3 0
3 years ago
Please help, all about Mirrors and Lenses
romanna [79]
Answer: I think it’s 20cm.
3 0
3 years ago
true or false? short-wave heat radiation is given off by the earth when the earth absorbs long-wave radiation.
Greeley [361]

Answer:

Hope this helps u, pls mark me brainlist

Explanation:

The sun emits shortwave radiation because it is extremely hot and has a lot of energy to give off. Once in the Earth's atmosphere, clouds and the surface absorb the solar energy. The ground heats up and re-emits energy as longwave radiation in the form of infrared rays.

4 0
2 years ago
What resistance is needed to cause a 20A current flow with a 100V battery?
timurjin [86]

Resistance = (voltage) / (current)

Resistance = (100 V) / (20 A)

<em>Resistance  =  5 Ω  (D)</em>

7 0
3 years ago
Read 2 more answers
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