A small submarine of mass 1000 kg sinks in water with a uniform speed of 2 m/s. What is the resultant force exerted on the submarine as it sinks?
Correct answer: A. 0 N
- A. 0 N
- B. 500 N
- C. 2000 N
- D. 10000 N
Explanation
When an object moves with a uniform speed, it implies there is no acceleration. According to Newton's First Law of Motion, the net force acting on an object with no acceleration is zero. The submarine experiences forces such as gravity and buoyancy, but these forces are balanced, resulting in a net force of 0 N. Options B, C, and D suggest non-zero resultant forces, which would imply that the submarine is accelerating, which contradicts the condition of moving at a constant speed.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Practise Force and Motion
1,421 free Force and Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Force and Motion questions
A cricket ball of mass 0.5 kg strikes a bat normally with a velocity of 30 m s-1 and rebounds with a velocity of 20 ms-1 in the opposite direction. The impulse of the force exerted by the ball on the bat is
A projectile can have the same range R for two angles of projection. If t1 and t2 are the times of nights in the two cases, then product of the time of flights is proportional to:
The average force necessary to stop a hammer with 25 N s momentum in 0.05 s expressed in 'N' is
A handball is tossed vertically upward with a velocity of 19.6 meters per second. Approximately how high will it rise?
Time taken by a projectile to reach maximum height is t =
A stone is thrown horizontally with an initial speed 30 m/s from a bridge. Find the stone's total speed when it enters the water4 s later. (Ignore air resistance.)