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Kaylis [27]
3 years ago
5

Hot coffee in a mug cools over time and the mug warms up. Which describes the energy in this system?

Physics
1 answer:
givi [52]3 years ago
3 0
Thermal energy from the coffee is transferred to the mug.
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Which two substances have no fixed shape and no fixed volume?
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Answer:

Gas like oxygen, nitrogen etc

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How do physicists distinguish one type of electromagnetic wave from another?
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An organ pipe open at both ends has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the
bazaltina [42]

Answer:

the frequency of the second harmonic of the pipe is 425 Hz

Explanation:

Given;

length of the open pipe, L = 0.8 m

velocity of sound, v = 340 m/s

The wavelength of the second harmonic is calculated as follows;

L = A ---> N   +  N--->N   +   N--->A

where;

L is the length of the pipe in the second harmonic

A represents antinode of the wave

N represents the node of the wave

L = \frac{\lambda}{4} + \frac{\lambda}{2} + \frac{\lambda}{4} \\\\L = \lambda

The frequency is calculated as follows;

F_1 = \frac{V}{\lambda} = \frac{340}{0.8} = 425 \ Hz

Therefore, the frequency of the second harmonic of the pipe is 425 Hz.

5 0
3 years ago
A driver's foot presses with a steady force of 20N on a pedal in a car as shown.
azamat

Answer:

160N

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Moments must be conserved - so.

20 * 0.4 = F * 0.05

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6 0
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How do you calculate the power in a circuit or device if given the current and the resistance?
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Answer:

you use the Ohms law so to find the voltage you would need to multiply the current by the resistance which gives you the power.

V- voltage

I- current

R- resistance

V= I×R

5 0
3 years ago
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