37. Which one of the following statements best explains why the weight of an obj

Question

37. Which one of the following statements best explains why the weight of an object of mass m is diflerent on Mars than it is on the Earth? A) The mass of Mars is different from that of Earth. B) The masses and radii of Mars and Earth are not the same. C) The mass m is further from the Earth's center when it is on Mars. D) The constant G is different on Mars E) The mass m will be different on Mars. Ans: B 38. A) What is the weight of a 2.50-kg bag of sand on the surface of the earth? 2.50 N B) 9.80 N C) 24.5 N D) 49.0N E) 98.0 N Ans: C 39. A 2.00-kg projectile is fired at an angle of 20.0°. What is the magnitude of the force exerted on the projectile when it is at the highest position in its trajectory? A) 19.6 N Neglect any effects of air resistance. D) 490 N E) ON B) 14.7 N C) 9.80 N Ans: A

Explanation / Answer

37) option a is not correct since it is half true

Option c is not true

Option d, constant G is same everywhere

Option e, mass m is same everywhere

38) value of gravitational acceleration, g= 9.8 m/s2

Weight= m*g = 2.5* 9.8 = 24.5 N

39) in projectile motion at all positions force on ball acting is same, it is its weight = mg

Weight= mg= 2*9.8 =19.6 N

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