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3 years ago

Q 6: A body throws a ball vertically up. It returns to the ground after 5 seconds. Find

Physics

1 answer:

Rasek [7]3 years ago

8 0

Answer:

Taking gravity to be 9.8m/s2, The velocity is 24.5m/s2.

Taking gravity to be 10m/s2, The velocity is 25m/s2.

Explanation:

According the first formula of motion under the influence of gravity for upward motion, v=u-gt, where v=final velocity, u=initial velocity, and t= time taken.

Here the time taken for the ball to reach the maximum point is half of 5, which is 2.5 seconds.

And v is 0, since at the maximum point gravity slows down the velocity to 0.

Finding the initial velocity,

v=u-gt

0=u-10(2.5)

u=10(2.5)

u=25m/s

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Answer:

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An astronaut circles the earth in a satellite at an altitude of 150 km. If the diameter of his pupils is 2.0 mm and the average

Fiesta28 [93]

Answer:

d = 49.5 m

hence we can say it is conceivable that he can distinguish sports stadiums on earth's surface but in Private houses? Cars? it can not becayuse they are are very small

Explanation:

Given data

altitude = 150 km

diameter = 2.0 mm

wavelength = 550 nm

to find out

is it conceivable that he can distinguish sports stadiums

solution

we will apply here formula that is

∅ = 1.2 λ / D

put here λ = 550 × $10^{-9}$ m and D = 2 × $10^{-3}$ m

∅ = (1.2 ) 550 × $10^{-9}$ / 2 × $10^{-3}$

∅ = 3.30 × $10^{-4}$ rad

d = 150 × $10^{3}$ × 3.30 × $10^{-4}$

d = 49.5 m

hence we can say it is conceivable that he can distinguish sports stadiums on earth's surface but in Private houses? Cars? it can not becayuse they are are very small

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3 years ago