Bhe lower right hand comer ofthe scaneron sheet Her out for a acceleration w be

Question

Bhe lower right hand comer ofthe scaneron sheet Her out for a acceleration w be "wace distance E) zero. 2 David lands and times larger than the Earth, what is the planet MAss expressed in mls plane iss Earth masses? E) 9/4 3 A 30. N stone is dropped from a height of 10 m, and strikes What average force of air friction the ground with a velocity of 15 m/s A) 4.1 N acts on it as it falls? B) 2 s N D) 7.2 N E) 1.2 N 4 what is the minimum energy needed to liet 10 kg to a height of 200 km and to give a speed of kms? (Neglect the small decrease of gr over that distance.) A) 34. MU B) 34. C 34. J D) 34. GU E) 34. Tu 5 Some driver's license exams have the following question. "A car moving 50 km/hr skids 15 meters with locked brakes. How far wil the car skid with locked brakes if it is moving at 150 km/hr?" A) 15 m B) 45 m D) 90 En 135 m w used to lift 200 kg 11 m above streetlevel to the roof of a buadine motor ran for 24 show much work did it do? A) 2200 B) 940 J 4800J D) 22560 E) 10340

Explanation / Answer

4)

here by using the formula

E = m * g * h + 0.5 * m * v^2

E = 1 * 9.8 * 2 * 10^5 + 0.5 * 1 * (8 * 10^3)^2

E = 34 * 10^6 J

therefore the correct option is A) 34 MJ

5)

here by using the third equation of motion

v^2 - u^2 = 2 * a * s

50^2 - 0 = 2 * a * 15 * 10^-3

a = 250000/3 km/h^2

then by using same for 150 km/hr

v^2 - u^2 = 2 * a * s

150^2 - 0 = 2 * 250000/3 * s

s = 27 / 200 km

s = 27000/200 = 135 m

so the correct option is E) 135 m

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