Forces and Motion | Physics Mdcat | Practice Mcqs | mosaicbro.com
Forces and Motion | Physics Mdcat | Practice Mcqs
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Review Answers:
43
At which angle when a projectile is launched H=R/4?
Correct Answer:B
Explanation:
For θ = 45°, maximum height H = R/4.
44
A ball is thrown with a force from the top of tower. The acceleration of the ball immediately after leaving the hand is?
Correct Answer:A
Explanation:
Once the ball leaves the hand, the only acceleration is due to gravity (g).
45
Potential energy is maximum at the highest point of the projectile motion. If the angle is?
Correct Answer:A
Explanation:
For θ = 90°, the projectile goes straight up, maximizing potential energy.
46
The rate of change of momentum of a freely falling body is?
Correct Answer:A
Explanation:
The rate of change of momentum (dp/dt) equals the force acting, which is the weight (mg).
47
The range of projectile at 30° is R, at the angle of 60° the range will be?
Correct Answer:B
Explanation:
Complementary angles (30° and 60°) yield the same range.
48
An stone is dropped from the top of a tower. If it takes 10 seconds to hit the ground, find the height of tower?
Correct Answer:D
Explanation:
Using h = 0.5 * g * t², with g = 9.8 m/s² and t = 10 s, h = 490 m.
49
A car starts from rest and move with constant acceleration. During the 5th second of its motion it covers a distance of 36 meters. What is the acceleration of the car?
Correct Answer:B
Explanation:
Distance covered in nth second: sₙ = u + a(n - 0.5). Here, u = 0, n = 5, sₙ = 36 ⇒ a = 8 m/s².