19. If the initial speed of a projectile is doubled, all other quantities remain

Question

19. If the initial speed of a projectile is doubled, all other quantities remaining the same, the range will: a. Halve: b. Remain the same c. Double; d. Quadruple. A20.0 kg box is suspended from a rope attached to the roof of an elevator. The elevator is moving down at a constant speed of 20 m/s. Questions 2022 refer to this situation 20. This situation is described by Newton's: a. First law; b. Second law. 21. The tension in the rope: a. Is less than the weight of the box; b Equals the weight of the box; c. is greater than the weight of the box. 22. The net force on the box is: a. Pointing up; Pointing down: c Zero. The elevator in the previous passage is now still moving down but coming to a halt. Questions 23-25 refer to this new situation. 23. This situation is described by Newton's: a. First law; b. Second law. 24. The tension in the rope: a is less than the weight of the box; b Equals the weight of the box, c. is greater than the weight of the box. 2s The net force on the box is: a. Pointing up: b. Pointing down; c. Zero. 26. Compared to their values on Earth, on the Moon: a. G is the same: g is different; b G is different, g is the same; c. G and g are both different; d. G and g are both the same.

Explanation / Answer

Here,

19)

as the range of projectile is given as

R = u^2 * sin(2 *theta)/(g)

if we double u , the range will be 2^2= 4 times

hence , correct option is d. Quadruple

20)

this situation is described by first law

as the object is moving with constant velocity

a) first law

21)

as there is no acceleration

net force on the elevator = zero

hence , tension in the rope = weight of the box

correct option is b)

22)

as the box is moving with constant velocity

the net force on the object must be zero

c) Zero

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