Concept explainers
A particle of mass m slides down an inclined plane under the influence of gravity. If the motion is resisted by a force f = kmυ2, show that the time required to move a distance d after starting from rest is
where θ is the angle of inclination of the plane.
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Chapter 2 Solutions
Classical Dynamics of Particles and Systems
- : A particle of mass 3 kg is moving with constant velocity of magnitude 10 m/s for 20s. The magnitude of the resultant force acting on the particle is: B) 1.5N B) 3 N C) 6 N D) 0 Narrow_forwardA 3.5 kg particle moves along an x axis according to x(t) = −12 + 5t2 − 4t3, with xin meters and t in seconds. In unit-vector notation, what is the net force acting on theparticle at t = 6 s?arrow_forwardYou drive an automobile of mass 2.10 x 103 kg from sea level to the top of a mountain 2.05 km high. What is its change in weight?arrow_forward
- Suppose that a projectile of mass m moves in a verticalplane in the atmosphere near the surface of the earth underthe influence of two forces: a downward gravitationalforce of magnitude mg, and a resistive force FR that isdirected opposite to the velocity vector v and has magnitudek v2 (where v = |v| is the speed of the projectile;see Fig. 4.1.15). Show that the equations of motion of theprojectile are mx'' = -kvx' , my'' = -kvy' -mg,arrow_forwardA 2500 kilogram truck is moving initially with a velocity of 10.00 meters per second. To change its velocity from 10.00 meters per second to 20.00 meters per second in a duration of 2.00 seconds, how much Force must be applied? 7500 N 12500 N 14700 N 3750 Narrow_forwardA kg mass is travelling with a constant speed of 5 m/s it is brought to rest in 2 seconds. The average force acting on it to bring it to rest is (a) 1.6 N (b) 2.5 N (c) 10.0 N (d) 40. 0 Narrow_forward
- An object of mass mm is initially at rest. After a force of magnitude F acts on it for a time T, the object has a speed v. Suppose the mass of the object is doubled, and the magnitude of the force acting on it is quadrupled. In terms of T, how long does it take for the object to accelerate from rest to a speed v now?arrow_forwardIf a 0.50 kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 4.2 N for a distance of 4.3 m, then what would be the block's velocity (in m/s)?arrow_forwardm = 8 kg v0 = 6 m/s F = 12 N the box reaches 10 m in 1.4 seconds If you wanted the box to reach a distance of x = 10 m in 0.761 seconds, to what value would you change the force (in N)?arrow_forward
- A certain cable of an elevator is designed to exert a force of 4.5 × 10^4 N. If the maximum acceleration that a loaded car can withstand is 3.5 m/s2, what is the combined mass of the car and its contents?arrow_forwardAn astronaut moves in space with a constant speed. If he is far from the influence of gravity of any star or planet, what is the minimum force required in order for him to keep on moving? a) force equal to its weight b) force equal to its mass c) force depending on its speed d) zeroarrow_forwardA 2500 kilogram truck is moving initially with a velocity of 10.00 meters per second. To change its velocity from 10.00 meters per second to 20.00 meters per second in a duration of 2.00 seconds, how much Force must be applied?arrow_forward
- Classical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage Learning