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Nataly [62]
3 years ago
15

Select the correct answer. What did Galileo discover when he dropped two cannon balls of different weights from the Leaning Towe

r of Pisa? A. The force acting on both of the balls was the same. B. The time for both of the balls to reach the ground was the same. C. A mass-dependent attractive force was exerted by Earth on the two balls. D. Gravity pulls everything downward. E. The balls exerted an attractive force between each other as they fell.
Physics
1 answer:
hoa [83]3 years ago
5 0

Galileo successfully demonstrated that the balls took the same amount of time to reach the ground.

Choice B

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A basketball player grabbing a rebound jumps 76.0 cm vertically. How much total time (ascent and descent) does the player spend.
MatroZZZ [7]

Answer: Part(a)=0.041 secs, Part(b)=0.041 secs

Explanation: Firstly we assume that only the gravitational acceleration is acting on the basket ball player i.e. there is no air friction

now we know that

a=-9.81 m/s^2  ( negative because it is pulling the player downwards)

we also know that

s=76 cm= 0.76 m ( maximum s)

using kinetic equation

v^2=u^2+2as

where v is final velocity which is zero at max height and u is it initial

hence

u^2=-2(-9.81)*0.76

u=3.8615 m/s\\

now we can find time in the 15 cm ascent

s=ut+0.5at^2

0.15=3.861*t+0.5*9.81t^2\\

using quadratic formula

t=\frac{-3.861+\sqrt{3.86^2-4*0.5*9.81(-0.15)} }{2*0.5*9.81}

t=0.0409 sec

the answer for the part b will be the same

To find the answer for the part b we can find the velocity at 15 cm height similarly using

v^2=u^2+2as

where s=0.76-0.15

as the player has traveled the above distance to reach 15cm to the bottom

v^2=0^2 +2*(9.81)*(0.76-0.15)

v=3.4595

when the player reaches the bottom it has the same velocity with which it started which is 3.861

hence the time required to reach the bottom 15cm is

t=\frac{3.861-3.4595}{9.81}

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8 0
3 years ago
A pendulum is made up of a small sphere of mass 0.500 kg attached to a string of length 0.950 m. The sphere is swinging back and
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Answer:

W = 0.842 J

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now let's use conservation of energy

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          Em₀ = U = m g h

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let's calculate

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