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3 years ago

When two things are the same temperature:

Physics

1 answer:

Archy [21]3 years ago

7 0

Answer:

When two objects are in thermal equilibrium they are said to have the same temperature. During the process of reaching thermal equilibrium, heat, which is a form of energy, is transferred between the objects.

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What is the resistance of a bulb of 40w connected in a line of 70v

olga55 [171]

Answer:

122.5 ohm

Explanation:

Given :

P=40 w

V= 70 V

R=?

Resistance can be calculated as :

$P=\frac{V^{2} }{R} \\40=\frac{(70)^{2} }{R}\\40=\frac{4900}{R} \\R=\frac{4900}{40} \\R=122.5 ohm$

Therefore, resistance of the bulb will be 122.5 ohm

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3 years ago

Why is nitrogen or helium filled in a filament lamp??

nirvana33 [79]

Argon gas is used in fluorescent and incandescent light bulbs to stop the oxygen in the light bulbs from corroding the hot tungsten filament.The use of argon in lightbulbs prevents the evaporation of the tungsten filaments, which results in increased light bulb life.

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3 years ago

Compare and contrast electric motors and generators.

Marrrta [24]

Electric motors require electricity to move the motor parts and do work (like an electric fan).

Elecgric generators actually burn diesel fuel to spin a motor around and around and around to GENERATE, or MAKE, electricity that you can then use to power your fans and lights in your house.

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3 years ago

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Nicole built a parachute, as seen here. She dropped the parachute from the top of the stairs, and it floated down very quickly.

siniylev [52]

answer C

Explanation:

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2 years ago

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A large ant is standing on the middle of acircus tightrope that is stretched with tension Ts. The rope has mass per unit length

77julia77 [94]

Answer:

Explanation:

The ant , at some point of time will be standing on the crest of moving wave passing under its feet . At that position the downward acceleration of the ant will be equal to its weight . Hence it will feel weightlessness . So at that time

Acceleration = g

Acceleration at the top position = ω²A where ω is angular velocity and A is amplitude of vibration ( transverse ) of crest .

ω =2 π n where n is frequency of transverse vibration of particles. This angular frequency will be equal to angular frequency of wave travelling on the rope .

frequency of travelling wave

n.= $\frac{1}{\gamma}\sqrt{\frac{T}{\mu} }$

ω =2 π x $\frac{1}{\gamma}\sqrt{\frac{T}{\mu}$

ω² = 4π² x T/γ²μ}

For weightlessness

ω² A = g

A= g x γ²μ / 4π² T

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3 years ago