2 years ago

1. How much work is done on a 20-N rock that you lift 1.5 meters up?

Physics

1 answer:

Tcecarenko [31]2 years ago

3 0

The answer will be B

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What are the units of radiation?

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The radiation dose absorbed by a person is measured using the conventional unit rad or the SI unit gray. The biological risk of exposure to radiation is measured using the conventional unit rem or the SI unit sievert.

I hope this helps!

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2 years ago

HELP ME please

allochka39001 [22]

Answer:

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1 year ago

Assume that, when we walk, in addition to a fluctuating vertical force, we exert a periodic lateral force of amplitude 25 n at a

icang [17]

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2 years ago

An airplane traveling at half the speed of sound emits a sound of frequency 4.68 kHz. (a) At what frequency does a stationary li

kkurt [141]

Answer:

(a) 9.36 kHz

(b) 3.12 kHz

Explanation:

(a)

V = speed of sound

$v$ = speed of airplane = (0.5) V

f = actual frequency of sound emitted by airplane = 4.68 kHz = 4680 Hz

f' = Frequency heard by the stationary listener

Using Doppler's effect

$f' = \frac{Vf}{V-v}$

$f' = \frac{V(4680)}{V-(0.5)V)}$

f' = 9360 Hz

f' = 9.36 kHz

(b)

V = speed of sound

$v$ = speed of airplane = (0.5) V

f = actual frequency of sound emitted by airplane = 4.68 kHz = 4680 Hz

f' = Frequency heard by the stationary listener

Using Doppler's effect

$f' = \frac{Vf}{V+v}$

$f' = \frac{V(4680)}{V+(0.5)V)}$

f' = 3120 Hz

f' = 3.12 kHz

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3 years ago

What type of units can be used for measurement?

Anna35 [415]

Answer:

Measurements most commonly use the International System of Units (SI) as a comparison framework. The system defines seven fundamental units: kilogram, metre, candela, second, ampere, kelvin, and mole.

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2 years ago