displacement of 2i + 4j+ 6k m.3. A body of mass 10 kg at rest is acted upon simultaneously by two forces 4 Nto each other. The kinetic energy of the body at the end of 10 sec is(C)50 J(D) 125 J(A)100 J(B) 300 J4) Consider an 80 kg man and 320 kg horse both running along a road with the same kinetic energy.The man must run(A) with the same speed as the horse.(CSS) 4 times as fast as the horse.(B) twice as fast as the horse.(D) 16 times as fast as the horse.5)particle A is travelling at a velocity of [Im/s. It collides with particle B which has a velocity of10,Jm/s. The particle move together. The mass of particle A is 2kg and the mass of particle B is 3kg.8.Find the velocity of the combined particles after the collision.50(B) m's(A) Im/s88.4,(C) 20m/s42.(D) 16 m/s46)Which of the following is NOT true about conservation of linear momentum.(A)The impulse becomes to zero.(C)The total momentum is constant.(B)The change in momentum is constant.(D)The change in momentum is zerotwo billiard balls of equal mass undergo a perfectly elastic head - on collision. If the speed of one ballwas initially 2.00m/s, and of the other 3.00m/s in the opposite direction, what will be their speedsVị & V2 after the collision respectively?(A)2m/s & - 3m/s(B) -3m/s & 2m/s(C)2m/s & 3m/s(D)-3m/s & -2m/sBy Yishak PaulosDate of Submission : 26/08/2013E.C

Given : To find incorrect statement about linear momentum conservation.

(A) [Im/s 6)Which of the following is NOT true about conservation of linear momentum. (A)The impulse becomes to zero. (C)The total momentum is constant. (B)The change in momentum is constant. (D)The change in momentum is zero Jf the speed of one bal

(A) [Im/s 6)Which of the following is NOT true about conservation of linear momentum. (A)The impulse becomes to zero. (C)The total momentum is constant. (B)The change in momentum is constant. (D)The change in momentum is zero Jf the speed of one bal

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Conservation Of Energy

Section: Chapter Questions

Problem 81P: Jane, whose mass is 50.0 kg, needs to swing across a river (having width D) filled with...

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Assume that the force of a bow on an arrow behaves like the spring force. In aiming the arrow, an archer pulls the bow back 50 cm and holds it in position with a force of 150 N. If the mass of the arrow is 50 g and the “spring” is massless, what is the speed of the arrow immediately after it leaves the bow?
Check Your Understanding There is a second solution to the system of equations solved in this example (because the energy equation is quadratic): v1.f=-2.5m/s , v2.f=0 . This solution is unacceptable on physical grounds; what’s with it?
A block of mass 0.500 kg is pushed against a horizontal spring of negligible mass until the spring is compressed a distance x (Fig. P7.79). The force constant of the spring is 450 N/m. When it is released, the block travels along a frictionless, horizontal surface to point , the bottom of a vertical circular track of radius R = 1.00 m, and continues to move up the track. The blocks speed at the bottom of the track is = 12.0 m/s, and the block experiences an average friction force of 7.00 N while sliding up the track. (a) What is x? (b) If the block were to reach the top of the track, what would be its speed at that point? (c) Does the block actually reach the top of the track, or does it fall off before reaching the top?
A large cruise ship of mass 6.50 107 kg has a speed of 12.0 m/s at some instant. (a) What is the ships kinetic energy at this time? (b) How much work is required to stop it? (c) What is the magnitude of the constant force required to stop it as it undergoes a displacement of 2.50 km?
Jane, whose mass is 50.0 kg, needs to swing across a river (having width D) filled with person-eating crocodiles to save Tarzan from danger. She must swing into a wind exerting constant horizontal force F, on a vine having length L and initially making an angle with the vertical (Fig. P7.81). Take D = 50.0 m, F = 110 N, L = 40.0 m, and = 50.0. (a) With what minimum speed must Jane begin her swing to just make it to the other side? (b) Once the rescue is complete, Tarzan and Jane must swing back across the river. With what minimum speed must they begin their swing? Assume Tarzan has a mass of 80.0 kg.
A certain automobile engine delivers 2.24 104 W (30.0 hp) to its wheels when moving at a constant speed of 27.0 m/s ( 60 mi/h). What is the resistive force acting on the automobile at that speed?
Two blocks, A and B (with mass 50.0 kg and 1.00 102 kg, respectively), are connected by a string, as shown in Figure P5.86. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is k = 0.250. Determine the change in the kinetic energy of block A as it moves from to , a distance of 20.0 m up the incline (and block B drops downward a distance of 20.0 m) if the system starts from rest. Figure P5.86
A 4.00-kg particle is subject to a net force that varies with position as shown in Figure P7.9. The particle starts from rest at x = 0. What is its speed at (a) x = 5.00 m, (b) x = 10.0 m, and (c) x = 15.0 m?
(a) What is the power output in watts and horsepower of a 70.0-kg sprinter who accelerates from rest to 10.0 m/s in 3.00 s? (b) Considering the amount of power generated, do you think a well-trained athlete could do this repetitively for long periods of time?
Check Your Understanding (a) A car and a truck each moving with the same kinetic energy. Assume that the truck has more mass than the car. Which has the greater speed? (b) A car truck are each moving with same speed. Which has the greater kinetic energy?
If only one external force acts on a particle, does it necessarily change the particles (a) kinetic energy? (b) Its velocity?
A block of mass 0.500 kg is pushed against a horizon-tal spring of negligible mass until the spring is compressed a distance x (Fig. P8.65). The force constant of the spring is 450 N/m. When it is released, the block travels along a frictionless, horizontal surface to point , the bottom of a vertical circular track of radius R = 1.00 m, and continues to move up the track. The blocks speed at the bottom of the track is v = 12.0 m/s, and the block experiences an average friction force of 7.00 N while sliding up the track. (a) What is x? (b) If the block were to reach the top of the track, what would be its speed at that point? (c) Does the block actually reach the top of the track, or does it fall off before reaching the top?