3 years ago

The rate at wich energy is used in a circuit

Physics

1 answer:

Vaselesa [24]3 years ago

3 0

Power is the rate at which energy is used in a circuit.

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what happens to the volume when temperature is held constant and the pressure is increased to 125 kPa

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The volume decreases, by a factor of

(the original pressure/(125 kPa).

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The planets that reside in the inner region of the solar system are called ______ (A. giants B.Ice Cap C.terrestral) planets. Th

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In this order terrestral, rocky, Venus, Earth

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A car on a roller coaster starts at zero speed at an elevation above the ground of 26 m. It coasts down a slope, and then climbs

nirvana33 [79]

The speed of the car at the top of the hill is 14m/s

<u>Explanation:</u>

given that

Initial velocity u of the car=0 m/s

The distance can be determined by finding out the difference between the elevation of the first slope and second slope.

elevation of the first slope=26 m

elevation of second slope=16m

distance s=26-16=10 m

acceleration due to gravity g=9.8 m/s2

speed of the car at the top of the hill can be determined by using the equation

$v^2=u^2+2as\\v^2=0^2+2\times 9.8\times 10\\=196\\v=\sqrt{196} =14m/s$

speed of the car at the top of the hill is 14m/s

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2 years ago

An elevator's electric hoist is rated at 8.0 kW and has an efficiency of 90.0%. The hoist lifts the elevator car, mass 1225 kg,

Nataly_w [17]

Part a)

Power rated on the elevator is given as

$P = 8 kW$

$P = 8 \times 10^3 W$

now the mass that is lifted above is given as

$m = 1225 kg$

height of the elevator lifted is

$h = 9 m$

now the potential energy is given as

$U = mgh$

$U = 1225 (9.8)(9) = 108045 J$

now power is defined as rate of energy

$P = \frac{W}{t}$

$8 \times 10^3 = \frac{108045}{t}$

$t = 13.5 s$

so it will take 13.5 s to lift up

Part b)

Electrical energy used

$efficiency = 90$

$0.90 = \frac{Output}{Input}$

$0.90 = \frac{108045}{Input}$

$Input = 120050 J$

so electrical energy used in this process will be 120050 J

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3 years ago

Five factors predisposing a person to stroke

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Answer:

the answers maybe→↓

Explanation:

high blood pressure.

cigarette smoking.

diabetes.

high blood cholesterol levels.

heavy drinking.

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