3 years ago

An object at free fall near the Earth’s surface experiences constant velocity.

Physics

1 answer:

mariarad [96]3 years ago

7 0

False it accelerates.

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Eric has a mass of 70 . He is standing on a scale in an elevator that is accelerating downward at 1.7 . What is the approximate

pychu [463]

Answer:

Explanation:

The value the scale shows is the reaction force to the normal force (they are equal by Newton's 3rd Law) that the scale exerts on Eric.

The forces on Eric are his weight (downward) and this normal force (upward), so we can write the net force over him as (also using Newton's 2nd Law):

$F=W-N=ma$

which means

$N=W-ma=mg-ma=m(g-a)$

and for our values this is:

$N=mg-ma=(70kg)(9.8m/s^2-1.7m/s^2)=567N$

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2 years ago

A paper clip that has a mass of 1.5 grams is thrown into the air and initially has a kinetic energy of 0.013 J.

Aleksandr [31]

answer

v = 4.2 $\frac{m}{s}$

set up an equation

we can use the formula for kinetic energy since we know mass and kinetic energy

K = $\frac{mv^{2}}{2}$

v = $\sqrt{\frac{2K}{m} }$

values

K = 0.013 J

m = 1.5g = 0.0015 kg

plug in values

v = $\sqrt{\frac{2*0.013}{0.0015} }$

v = 4.2 $\frac{m}{s}$

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3 years ago

Proof that the kinetic energy of a moving body is half mv square

Ivenika [448]

Answer:

Explanation:

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2 years ago

What happens to an object as it absorbs radiant energy? A Its temperature increases. B Its temperature decreases. C Its thermal

horrorfan [7]

A as the radiant from the object heats it up its kinda like thermal heat in a way

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3 years ago

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Student in ms sawyers class built balloon cars the balloon car works this way as the gas in the balloon is released the car move

RUDIKE [14]

Answer:

Third Law of Motion

Explanation:

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2 years ago