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3 years ago

75 kilometers per hour is an example of: A. speed. B. velocity C. acceleration

Physics

2 answers:

kherson [118]3 years ago

5 0

The answer is A. speed
hope this helps! :D

ozzi3 years ago

4 0

It is A. Speed as speed is how fast you are traveling and 75 kilometers per hour is how fast you are traveling.

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How many joules are there in 200kj

Lesechka [4]

Answer:

200,000 joules <3

Explanation:
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2 years ago

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After landing aeroplanes momentum becomes 0. Explain how the law of conservation holds here.

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3 years ago

Two bulbs marked 200 W-250 V and 100 W-250 V are joined in

lozanna [386]

Answer:

Explanation:

<u>Joule Heating</u>

It's the process by which the electric current passing through a conductor produces heat.

Also known as Joule's first law or the Joule–Lenz law, states that the power of heating generated by an electrical conductor (P) is proportional to the product of its resistance (R) and the square of the current (I).

It can be described by the equation that follows:

$P = I^2.R$

Also, we can calculate the voltage V with the formula of Ohm's law:

$V = I.R$

Combining both equations, power can be related to the voltage:

$\displaystyle P=\frac{V^2}{R}$

Given the power and the voltage, the resistance can be calculated by solving for R:

$\displaystyle R=\frac{V^2}{P}$

There are two bulbs marked P=200W V=250V and P=100 W V=250.

The first bulb has a resistance of:

$\displaystyle R_1=\frac{250^2}{200}$

$\displaystyle R_1=312.5\Omega$

The first bulb has a resistance of:

$\displaystyle R_2=\frac{250^2}{100}$

$\displaystyle R_1=625\Omega$

When connected in series, the total resistance is

$R = R_1 + R_2=312.5\Omega+625\Omega$

$R=937.5\Omega$

The total power consumed when connecting them to a V=250 V supply is:

$\displaystyle P=\frac{250^2}{937.5}$

P = 66.67 W

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3 years ago

I need help! plz, It's about energy. its just middle school science

Anit [1.1K]

Answer:

it would be 12/A

Explanation:

if you dived 5 by 12 youll get 60 and you cant get 60 y anything else in there so therefor its 12 :)

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3 years ago

What energy transformation takes place when an object is pushed up an inclined plane?

Fofino [41]

When you are pushing an object up an inclined plane, the object is gaining gravitational potential energy as it is gaining height. The kinetic energy of the object decreases and converts into that potential energy as you go up. When you have stopped, all of the kinetic energy of the object has fully been converted to gravitational potential energy.

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3 years ago

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