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olasank [31]
3 years ago
11

Find the approximate kinetic energy of a circular wheel of radius r and mass M that is rotating about its center at 2 cycles/s.

Assume the wheel’s mass is concentrated at the rim and the mass of the wheel’s spokes is negligible.
Physics
1 answer:
alukav5142 [94]3 years ago
6 0

Answer:

8M(r\pi)^2

Explanation:

First we convert 2 cycles/s to angular velocity knowing that each circle has an angle of 2π

\omega = 2 * 2\pi = 4\pi rad/s

Then we calculate the moment of inertia of the cylindrical shell, assuming there's no mass inside the wheel (only at the rim):

I = mr^2 = Mr^2

So the kinetic energy of this is

E_k = I\omega^2/2 = Mr^2*(4\pi)^2/2 = 8M(r\pi)^2

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Answer:

When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.

What is specific heat capacity?

Specific heat capacity is the quantity

of heat required to raise a unit mass of

a substance by 1 kelvin.

Specific heat capacity of water and sand

{<em>refer to the above attachment}</em>

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2 years ago
The pressure exerted by a gas is 2.0 atm while it has a volume of 350 mL. What would be the volume of this sample of gas at stan
PSYCHO15rus [73]

Answer:

volume is 700 mL

Explanation:

pressure = 2 atm

volume = 350 mL = 0.350 L

to find out

volume

solution

we will apply here equation that is

P1×V1 = P2×V2   ..............1

here P1 = 2 and V1 = 0.350 and P2 = 1 for standard atmospheric pressure

so put all value here  in equation 1 and get V2 volume

2 × 0.350 = 1 × V2

V2 = 0.700 L

V2 = 700 mL

so volume is 700 mL

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2 years ago
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Nataliya [291]

Answer:

Generally, a solute dissolves faster in a warmer solvent than it does in a cooler solvent because particles have more energy of movement. For example, if you add the same amount of sugar to a cup of hot tea and a cup of iced tea, the sugar will dissolve faster in the hot tea.

My answer:

sugar dissolves more quickly in warm coffee because it's hot, it dissolves easily in hot coffee but it will take time to mix with cold iced tea.

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2 years ago
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