You can someone please solve these two please and thank you Question 38 Not answ

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You

can someone please solve these two please and thank you

Question 38 Not answered Marked out of 1.00 The focal length of the simple converging (biconvex) lens is 12.5 cm (centimeters). Give the focussing power (in diopters) of this lens. Answer:0 dio pFlag question The correct answer is: +8 D Question 39 Not answered Marked out of 1.00 The football player kicks the ball of mass m = 700 g with velocity v = 12 m/s. The time (t) of contact (moment joint) between the foot and the ball is 0.03 second (30 milliseconds). Calculate the value of the Flag question force F acting on the ball Answer

Explanation / Answer

13.

f = focal length = 12.5 cm

Power is given as

P = 100/f

P = 100/12.5

P = 8

39)

m = mass of the ball = 700 g = 0.7 kg

vi = initial velocity of the ball before kick = 0 m/s

vf = final velocity of the ball after kick = 12 m/s

t = time of contact = 30 ms = 0.030 sec

F = force

using impulse-change in momentum equation

F t = m (vf - vi )

F (0.030) = (0.7) (12 - 0)

F = 280 N

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