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4 years ago

If you know that a person is running 100 feet every 12 seconds, you can determine their __________.

1 answer:

6 0

<span>If you know that a person is running 100 feet every 1 seconds, you can determine their velocity. Velocity is the rate of motion. i.e. the rate at which the person is running. Velocity is given by distance / time. In the given question the distance is 100 feet while the time is 12 seconds. So to determine the velocity, we divide 100 by 12 to get 8.33 feet per second.</span>

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A machine part has the shape of a solid uniform sphere of mass 250 g and a diameter of 4.30 cm. It is spinning about a frictionl

zysi [14]

Answer: $\alpha =9.302\ rad/s^2$

Explanation:

Given

mass of sphere $m=250\ gm$

diameter of sphere $d=4.30\ cm$

radius $r=\frac{4.30}{2}\ cm$

$f=0.0200\ N$

friction will provide resisting torque so

$f\times r=I\times \alpha$

where $I=\text{moment of Inertia}$

$f=\text{friction force}$

$\alpha =\text{angular acceleration}$

$I=\frac{2}{5}mr^2$

$0.02\times r=\frac{2}{5}mr^2\times \alpha$

$\alpha =\frac{5}{2r}\times f$

$\alpha =\frac{5}{2}\times \frac{2}{4.3\times 10^{-2}}\times 0.02$

$\alpha =9.302\ rad/s^2$

(b)time taken to decrease its rotational speed by $21\ rad/s$

$t=\dfrac{\Delta \omega }{\alpha }$

$t=\dfrac{21}{9.302}$

$t=2.25\ s$

6 0

3 years ago

Calculate the average speed (in km/h) of a car stuck in traffic that drives 12 kilometers in 2 hours.

Vilka [71]

This is a trick question, isn't it? If a car is stuck in traffic, it doesn't matter how fast it can travel, because it isn't moving at all. Therefore the average speed would be zero, right?

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4 years ago

3. What would the seasons be like if Earth's orbit had the eccentricity value of Mars?

densk [106]

Answer:

123456789

Explanation:

3 0

3 years ago

Read 2 more answers

How many times can mechanical energy become chemical energy

maria [59]

Answer:

Chemical energy, Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic.

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3 years ago

Two containers have a substantial amount of the air evacuated out of them so that the pressure inside is half the pressure at se

adoni [48]

Answer:

$(a)\ F_{No} = [P_{No} - \frac{P_{area}}{2}]* A$