03:24Physics introduction: momentum and impulse for an accelerating cart using final and initial momentumZak's Lab461views2rank
Multiple ChoiceHow fast would you have to throw a 150-g rock for it to have the same momentum as a 10-g sniper rifle bullet traveling at 900 m/s?584views58rank3comments
Multiple ChoiceA 250 g rubber ball bounces off a wall. As it strikes the wall, it is moving in the negative x-direction at 11m/s, and as it bounces off, it is moving in the positive x-direction at 10m/s. What is the impulse on the ball from the wall?532views
Multiple ChoiceThree cars approach an intersection: an 800 kg car moves in the positive x-direction at 10m/s, a 1200 kg car moves in the negative x-direction at 5m/s, and a 900 kg car moves in the positive y-direction at 12m/s. What is the total momentum of this system of three cars? Give your answer as a magnitude and an angle counterclockwise from the positive x-axis.539views
Textbook QuestionTwo vehicles are approaching an intersection. One is a 2500-kg pickup traveling at 14.0 m/s from east to west (the -x-direction), and the other is a 1500-kg sedan going from south to north (the +y-direction) at 23.0 m/s. (b) What are the magnitude and direction of the net momentum?1916views
Textbook QuestionTwo vehicles are approaching an intersection. One is a 2500-kg pickup traveling at 14.0 m/s from east to west (the -x-direction), and the other is a 1500-kg sedan going from south to north (the +y-direction) at 23.0 m/s. (a) Find the x- and y-components of the net momentum of this system.476views
Textbook Question(I) What is the magnitude of the momentum of a 32-g sparrow flying with a speed of 8.4 m/s?174views
Textbook Question(II) Suppose the conveyor belt of Example 9–20 is retarded by a friction force of 150 N. Determine the required output power (hp) of the motor as a function of time from the moment gravel first starts falling (t = 0) until 3.0 s after the gravel begins to be dumped off the end of the 22-m-long conveyor belt.128views
Textbook Question(III) A sled filled with sand slides without friction down a 32° slope. Sand leaks out a hole in the sled at a rate of 2.0 kg/s. If the sled starts from rest with an initial total mass of 45.0 kg, how long does it take the sled to travel 120 m along the slope?219views
Textbook Question(II) The force on a particle of mass m is given by F (→ above F) = 26 i (→ above i) ― 12t j (→ above j) where F is in N and t in s. What will be the change in the particle’s momentum between t = 1.0 s and t = 2.0 s?154views
Textbook QuestionWhat are the velocities of (b) a 75 kg skydiver falling with p = -4100j kg m/s281views
Textbook QuestionAt what speed do a bicycle and its rider, with a combined mass of 100 kg, have the same momentum as a 1500 kg car traveling at 5.0 m/s?378views
Textbook QuestionFIGURE EX11.6 is an incomplete momentum bar chart for a collision that lasts 10 ms. What are the magnitude and direction of the average collision force exerted on the object? 445views
Textbook QuestionA tennis player swings her 1000g racket with a speed of 10 m/s .She hits a 60g tennis ball that was approaching her at a speed of 20 m/s . The ball rebounds at 40 m/s. b. If the tennis ball and racket are in contact for 10 ms, what is the average force that the racket exerts on the ball? How does this compare to the gravitational force on the ball?338views
Textbook QuestionCALC A particle of mass m is at rest at t=0 . Its momentum for t>0 is given by px = 6t² kg m/s ,where t is in s. Find an expression for Fx (t) , the force exerted on the particle as a function of time.306views
Textbook QuestionCALC A 500 g particle has velocity vx = −5.0 m/s at t=−2 s .Force Fx= (4−t²) N , where t is in s, is exerted on the particle between t=−2 s and t=2 s . This force increases from 0 N at t=−2 s to 4 N at t=0 s and then back to 0 N at t=2 s . What is the particle's velocity at t=2 s?396views
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