2 years ago

5. While a gas does 500J of work on its surroundings, 800J of heat is added to the gas. The

Physics

1 answer:

andreev551 [17]2 years ago

4 0

Explanation:

a) ΔU = -500 J + 800 J = 300 J

b) ΔU = mCΔT

300 J = (0.3 kg) (1000 J/kg/°C) ΔT

ΔT = 1 °C

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A Heavy crate applied a force of 1500 N on a 25m2 piston. What force needs to be applied on a 0.8m2 piston to lift the crate?

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A star is moving away from an observer at 1% of the speed of light. At what wavelength would the observer find an emission line

Ivan

Answer:

λ = 5940 Angstroms

Explanation:

This is an exercise of the relativistic Doppler effect

f’= f √((1- v / c) / (1 + v / c))

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Let's use the relationship

c = λ f

f = c /λ

We replace

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λ = λ’ √ ((1- v / c) / (1 + v / c))

Let's calculate

v = 0.01 c

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v= 3 10⁶ m / s

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2 years ago

The potential energy of a watermelon is 15.0 J. The watermelon is 3.0 m high. What is the mass of the watermelon?

maks197457 [2]

Answer:

m = 0.51[kg]

Explanation:

Potential energy is defined as the product of mass by gravity by height.

$E_{pot}=m*g*h$

where:

Epot = potential energy = 15 [J]

m = mass [kg]

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h = elevation = 3 [m]

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2 years ago