11. Momentum & Impulse

In which of the following cases is the magnitude of the $p$ (momentum) of an object increasing?

Which of the following objects has the greatest momentum?

A cart with mass $0.250kg$ is moving at a velocity of $0.400m/s$. What is its momentum?

What is the momentum of a $5\mathrm{kg}$ object that has a velocity of $1.2\frac{m}{s}$?

How 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?

Two 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. What are the magnitude and direction of the net momentum?

Two 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. Find the x- and y-components of the net momentum of this system.

What is the magnitude of the momentum of a 32-g sparrow flying with a speed of 8.4 m/s?

(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.

(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?

The force on a particle of mass m is given by $\vec{F}=26\vec{i}-12t^2\vec{j}$ 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?

What are the velocities of a 75 kg skydiver falling with $\overrightarrow{p}=-4100j\text{ kg m/s}$?