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3 years ago

Will it take longer for a train or a car traveling at 100 mi/hr to stop

Physics

2 answers:

Pani-rosa [81]3 years ago

6 0

It typically take longer for a heavier object to slow down therefor, a train will take more time. <span />

Allushta [10]3 years ago

3 0

<h3><u>Answer;</u></h3>

A train will take longer time to stop compared to a car.

<h3><u>Explanation;</u></h3>

For a body in motion to stop a braking force at a given distance is required for the body to loose kinetic energy.
The the stopping distance of a car depends on the breaking force and the the mass of the moving body. The stopping distance will depend on the kinetic energy and the breaking force acting to stop the motion of a body.
<em><u>The mass of a moving body determines its kinetic energy, and also determines the resultant force according to the newton seconds law of motion . Therefore, mass determines the breaking force and the stopping distance, such that a big body in motion will require more force to stop and will take a longer stopping distance and time.</u></em>

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3 years ago

A spring is characterized by a spring constant of 60 N/m. How much potential energy does it store, when stretched by 1.0 cm?

Anestetic [448]

Answer:

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Explanation:

The potential energy of a spring is given by PE = (0.5)k*x^2

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3 years ago

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snow_lady [41]

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3 years ago

What kind of friction is occurring between a pencil and desktop when you flick the pencil?

DanielleElmas [232]

The third one sliding friction
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3 years ago

Heights of men on a baseball team have a bell-shaped distribution with a mean of 166 cm 166 cm and a standard deviation of 5 cm

kaheart [24]

Answer:

95 %

99.7 %

Explanation:

$\mu$ = 166 cm = Mean

$\sigma$ = 5 cm = Standard deviation

a) 156 cm and 176 cm

$166-5\times 2=156$

$166+5\times 2=176$

From the empirical rule 95% of all values are within 2 standard deviation of the mean, so about 95% of men are between 156 cm and 176 cm.

b) 151 cm and 181 cm

$166-5\times 3 =151$

$166+5\times 3=181$

The empirical rule tells us that about 99.7% of all values are within 3 standard deviations of the mean, so about 99.7% of men are between 151 cm and 181 cm.

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3 years ago