2 years ago

When water freezes, what happens to the temperature of the surrounding air?

Physics

1 answer:

snow_tiger [21]2 years ago

3 0

It gets warmer because the forming ice gives heat up

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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,

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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

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

now power is defined as rate of energy

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

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$t = 13.5 s$

so it will take 13.5 s to lift up

Part b)

Electrical energy used

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Make the curvature radius 0.6 m, the refractive index 1.5, and the diameter 0.6 m. place the lamp so that the source of light is

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We are given
r = 0.6 m
n = 1.5
D = 0.6 m, R1 = 30 cm
R2 = 120 cm

We are asked to get the focal length and the distance of the focal plane from the lens

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1 / f = ( n - 1) (1/R1 - 1/R2)
Substituting and solving for f
1/ f = (1.5 - 1) (1/30 - 1/120)
f = 80 cm

The focal length is 80 cm and the distance of the focal plane from the lesn is 80 cm - 30 cm = 50 cm.<span />

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