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Nataly [62]
3 years ago
11

A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the velocity ofthe ball the instant befo

re it hits the ground?
Physics
1 answer:
Sergeeva-Olga [200]3 years ago
5 0

Answer: The velocity of the ball is 30.0 m/s

This can be calculated by using the value of acceleration as 10.0 m/s2 in free fall and the given time of 3.0 seconds. To get the velocity, one will have to multiply the acceleration with the given time and the quotient would result to 30.0 m/s. Mostly all object regardless of their mass, fall to earth with the same acceleration in the absence of air resistance and as the child drops the ball from a window, it gains speed as it falls.

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tia_tia [17]

Explanation:

use equation power=watts/time

to find time rearrange to make time = power/wats

so you have your equation substitute the numbers

so 9560J/860W is 11 minutes

5 0
3 years ago
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A bumper cart has a mass of 200 kg and has a protective bumper around it that behaves like a spring. The spring constant is 5000
34kurt
Part A:
For this part we’re assuming all the kinetic energy of the moving bumper car is converted into elastic potential energy in the spring since the car is brought to rest. Therefore you can find the total kinetic energy to get your answer:

KE = ½ mv^2
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Part B:
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4 0
3 years ago
What is the average speed of a car that travelled 400 miles in 6 hours?
Reil [10]

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About 66 miles per hour

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An electron is confined to a one dimensional infinite potential well 150 pm. How much energy must it absorb if it is to jump to
igor_vitrenko [27]

Answer:

\Delta E=1.22\times 10^{-22}J

Explanation:

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We know that h=6.67\times 10^{-34}

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\Delta E=1.22\times 10^{-22}J

7 0
3 years ago
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kompoz [17]
If the rabbits died out, the other organisms would be likely to die. (If that were their main source of food.)

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good luck!
3 0
3 years ago
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