3 years ago

Give two examples of forces you exerted on objects today. What factors were different about each force you mentioned?

Physics

1 answer:

Scrat [10]3 years ago

4 0

Answer:gravity and friction

Explanation:Gravity to keep yourself on the ground and friction to not slide when are walking.

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P=mgh
h=P/mg
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3 years ago

Which of the following describes volume?

kolezko [41]

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It refers to the area within which some body is contained, and is usually measured in cubic meters, or any variation of the meter.

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3 years ago

. What is the kinetic energy of a 10 kg car that is moving 4 m/s?

Darya [45]

Answer:i belive the answer is E = 1/2 mv^2

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3 years ago

A stationary horn emits a sound with a frequency of 228 Hz. A car is moving toward the horn on a straight road with constant spe

stiks02 [169]

Answer: 26.84 m/s

Explanation:

Given

Original frequency of the horn $f_o=228\ Hz$

Apparent frequency $f'=246\ Hz$

Speed of sound is $V=340\ m/s$

Doppler frequency is

$\Rightarrow f'=f_o\left(\dfrac{v+v_o}{v-v_s}\right)$

Where,

$v_o=\text{Velocity of the observer}\\v_s=\text{Velocity of the source}$

Insert values

$\Rightarrow 246=228\left[\dfrac{340+v_o}{340-0}\right]\\\\\Rightarrow 366.84=340+v_o\\\Rightarrow v_o=26.8\ m/s$

Thus, the speed of the car is $26.84\ m/s$

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3 years ago

Yellow-green light has a wavelength of 560 nm. What is its frequency?

Natasha2012 [34]

5.4 x 1014Hz
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3 years ago

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