Learning Materials
Features
Discover
Chapter 11: Q. 43 (page 289)
A particle of mass m is at rest at t = 0. Its momentum for is given by kg m/s, where t is in s. Find an expression for , the force exerted on the particle as a function of time.
The expression for the force is
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
Far in space, where gravity is negligible, a rocket traveling at fires its engines. FIGURE EX11.11 shows the thrust force as a function of time. The mass lost by the rocket during these is negligible.
a. What impulse does the engine impart to the rocket?
b. At what time does the rocket reach its maximum speed? What is the maximum speed?
A plastic cart and a lead cart can both roll without friction on a horizontal surface. Equal forces are used to push both carts forward for a distance of , starting from rest. After traveling , is the momentum of the plastic cart greater than, less than, or equal to the momentum of the lead cart? Explain.
Dan is gliding on his skateboard at . He suddenly jumps backward off the skateboard, kicking the skateboard forward at . How fast is Dan going as his feet hit the ground? Dan鈥檚 mass is and the skateboard鈥檚 mass is
Angie, Brad, and Carlos are discussing a physics problem in which two identical bullets are fired with equal speeds at equalmass wood and steel blocks resting on a frictionless table. One bullet bounces off the steel block while the second becomes embedded in the wood block. 鈥淎ll the masses and speeds are the same,鈥� says Angie, 鈥渟o I think the blocks will have equal speeds after the collisions.鈥� 鈥淏ut what about momentum?鈥� asks Brad. 鈥淭he bullet hitting the wood block transfers all its momentum and energy to the block, so the wood block should end up going faster than the steel block.鈥� 鈥淚 think the bounce is an important factor,鈥� replies Carlos. 鈥淭he steel block will be faster because the bullet bounces off it and goes back the other direction.鈥� Which of these three do you agree with, and why?
A 100 g ball moving to the right at 4.0 m/s collides head-on with a 200 g ball that is moving to the left at 3.0 m/s.
a. If the collision is perfectly elastic, what are the speed and direction of each ball after the collision?
b. If the collision is perfectly inelastic, what are the speed and direction of the combined balls after the collision?
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine