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2 years ago

What is the mass of a baseball that has a kinetic energy of 100 J and travel at 5 m/s

Physics

2 answers:

djyliett [7]2 years ago

8 0

Mass = kinetic energy * 2 / velocity^2

=> mass= 100 * 2 / 5^2

= 200 / 25 = 8 kg

in short , your answer is 8 kg

serious [3.7K]2 years ago

4 0

K.E= 1/2 mv²
So, m= K..E*2/v²
∴ m= 100 *2/ 25
m=8 Js²/m
As, the unit of K.E and velocities are in SI so unit of mass would also be in SI i.e, kg
So, m=8 kg

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Answer:

The distance of separation is decreased

Explanation:

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2 years ago

In a 350-m race, runner A starts from rest and accelerates at 1.6 m/s^2 for the first 30 m and then runs at constant speed. Runn

kifflom [539]

Answer:

B can take 0.64 sec for the longest nap .

Explanation:

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Put the value in the equation

$30=0+\dfrac{1}{2}\times1.6\times t_{A}^2$

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$t_{A}=6.12\ sec$

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Using equation of motion

$s=ut+\dfrac{1}{2}at_{B}^2$

Put the value in the equation

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$t_{B}=\sqrt{\dfrac{30\times2}{2.0}}$

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Using formula for difference of time

$t'=t_{A}-t_{B}$

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Hence, B can take 0.64 sec for the longest nap .

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3 years ago

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2 years ago

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Answer:

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We have to choose the satellite having greatest gravitational force with earth. In all options the distance from the earth is same i.e. 320 km. So, we have to select the satellite having maximum mass because the mass of the earth is constant.

Hence, the correct option is (D) " Satellite D has a mass (kg) of 500 and the distance from Earth (km) is 320 ".

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3 years ago

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irinina [24]

[:] Answer [:]

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