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2 years ago

It takes 1 minute for 45 c to pass a point in a circuit, what is the current flowing through the circuit?

Physics

1 answer:

Alex Ar [27]2 years ago

4 0

Answer:

0.67 A

Explanation:

I = ?

t = 1min = 60sec

q = 45 C

I = q/t

I = 45/60

I = 2/3

I = 0.67 A

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A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz. A spaceship approaches the beacon with a relative

Mekhanik [1.2K]

Answer:

The frequency heard y the ship is 70 MHz.

Explanation:

True frequency, f = 50 MHz

speed of source, vs = 0

speed of observer, vo = 0.4 c

Let the frequency heard by the ship is f'.

Use the formula of doppler's effect

$f' = \frac{v +v_o}{v+ v_s}f\\\\f' = \frac{c + 0.4 c}{c}\times 50\\\\f' = 1.4\times 50\\\\f' = 70 MHz$

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2 years ago

the candle had 350 J of energy in the chemical store. As it burned, 250 J was transferred by lighting to the surrounding

Elan Coil [88]

Answer:

Efficiency = 71%

Explanation:

Given the following data:

Output energy = 250 Joules

Input energy = 350 Joules

To find efficiency;

$Efficiency = \frac {Out-put \; energy}{In-put \; energy} * 100$

Substituting into the equation, we have;

$Efficiency = \frac {250}{350} * 100$

$Efficiency = 0.7143 * 100$

Efficiency = 71.43 ≈ 71%

Therefore, the efficiency of the candle is 71 percent.

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2 years ago

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Horatio drew a diagram to illustrate how magnetism is produced by electric currents

dimaraw [331]

<span>The magnetic field does not continually spread outward from the wire.</span>

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Why does the cord of an electric heater not glow while the heating element does

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Answer: Why does the cord of an electric heater not glow while the heating element does? The heating element of the heater is made up of alloy which has very high resistance so when current flows through the heating element, it becomes too hot and glows red. But the resistance of cord which is usually of copper or aluminum is very low so it does not glow.

Explanation:

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