### Conservation of Angular Momentum: Mississippi River Deposits

A sizeable quantity of earth is washed down the Mississippi River and deposited in the Gulf of Mexico. What effect does this tend to have on the length of a day?

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A sizeable quantity of earth is washed down the Mississippi River and deposited in the Gulf of Mexico. What effect does this tend to have on the length of a day?

A 62-kg child is sitting on a wagon full of bricks that has a mass of 150 kg. In order to move the wagon without touching the ground, the child throws two bricks each of mass 3.0 kg in the direction opposite to the direction the wagon is to go. How fast will the wagon move if the bricks are thrown at 2.0 m/s?

A 1200 kg car is moving east at 30 m/s and collides with a 3600 kg truck moving at 20 m/s in a direction 60 degrees north of east. The vehicles interlock and move off together. Find their velocity (magnitude and direction). OK, I used conservation of linear momentum and said that the final velocities were equal. Dividing the

An object at rest explodes into three pieces of equal mass. One moves east at 20 m/s; a second moves 45 degrees south of east at 30 m/s. What is the velocity of the third piece? OK, I know that the initial linear momentum of zero must be conserved, so I can start summing my momentum in the x and y directions. I'm just confuse

In Fig. 9-32a, a 5.1 kg dog stands on an 21 kg flatboat and is 6.1 m from the shore. He walks 2.1 m on the boat toward shore and then stops. Assuming there is no friction between the boat and the water, find how far the dog is then from the shore? (Hint: See Fig. 9-32b. The dog moves leftward; the boat moves rightward; but does

A shell is fired from a gun with a muzzle velocity of 14 m/s, at an angle of 60° with the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass (Fig. 9-30). One fragment, whose speed immediately after the explosion is zero, falls vertically. How far from the gun does the other fragment la

A raft of mass 180kg carries two swimmers of 50 kg and 80 kg. The raft is initially at rest but the swimmers dive off opposite ends each at 3 m/s. With what velocity and in what direction does to raft start to move?

A golf ball weighing .45 N is dropped from a height 1 meter and has a perfect elastic collision with the floor. What is time required to hit floor? What is the instantaneous momentum of the ball before it strikes the floor? What will be the change in momentum from the instant before it hits the ground to right after it

For ota 102509 103606; 103846; 103642. please see attachments. Answers: A) 8 ft./ sec. right; B) 36.6 degrees; V c = 10.39 ft/sec; Vd = 8.72ft. sec;

Please see attachments ans. Va = 1.7 m/sec. right; Vb = 3.3 m/sec. right. please address 165 specifically

A bullet of mass M= .0052 kilogram moving horizontally at speed V=672 m/sec, stikes a stationary wood block of mass m= 0.700 kilogram on a level frictionless surface. The bullet emerges with its speed reduced to S= 428 m/sec. Find the speed of the wood block after the bullet emerges.

1. A pitcher claims he can throw a 0.145 kg baseball with as much momentum as a speeding bullet. Assume that a 3.00 g bullet moves at a speed of 1.50 x 10^3 m/s. a. What must the baseball's speed be if the pitcher's claim is valid? B. Which has greater kinetic energy, the ball or the bullet? 2. What is the relations

Two friends, Al and Jo, have a combined mass of 168 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring is kept from pushing them apart because they are holding each other. When they release their arms, Al moves off in one direction at a

A car with a mass of 2,200 kg traveling at a velocity of 20 m/sec collides with a parked car. After the collision its velocity is +10 m/sec. If the mass of the parked car is 1,200 kg, determine: (a) Speed of the parked car after the collision. (b) Average force exerted on the parked car if the collision time (delta t) =0.

A car with a mass of 2200 kgm traveling at a velocity of 20 m/sec collides with a parked car. After the collision its velocity is +10 m/sec. If the mass of the parked car is 1200 kgm, determine (a) Speed of the parked car after the collision. (b) Average force exerted on the parked car if the collision time (delta t) =0

A 0.343 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with one half the original speed of the first ball. 1) What is the mass of the second ball? And 2) what fraction of the original kinetic energy gets transferred to the second ball?

Hi. Can someone please show me how to do the following problem? "A 5620 kg open railroad car coasts along with a constant speed of 8.66 m/s on a level track. Snow begins to fall vertically and fills the car at a rate of 3.50 kg per minute. Ignoring friction with the tracks, what is the speed of the car after 86.4 minutes?"

A first box car with mass 9800 travelling at the speed 14.9m/s striking the second box car at rest. Then, both cars are sticked together and travel with the speed 6.58m/s. Find the mass of the second car.

"Find the speed at which Superman (mass = 89.0 g) must fly head-on into a train (mass = 16405 kg) traveling at 75.0 km/hr to stop it."

High speed stroboscopic photographs show that the head of a 184 g golf club is traveling at 52.9 m/s just before it strikes a 45.1 g golf ball at rest on a tee. After the collision, the club head travels (in the same direction) at 42.2 m/s. Find the speed of the golf ball just after impact. Ignore the mass of the club handle.

"A 122 kg astronaut (including space suit) acquires a speed of 2.50 m/s by pushing off with his legs from a 1900 kg space capsule. What is the change in speed of the capsule?"

An object of mass 2 kg travelling in a straight line with a velocity of 20m/sec collides with, and strikes to, a stationary object of mass 3 kg. They both move off together in the same straight line with a velocity of v m/sec. If no external forces are acting calculate a. the total momentum just before the impact b. the tot

Q. An object sitting on a smooth surface is given an impulse (force) to start from rest and reached a veloctiy of 5m/sec in 2 seconds. 1. What is the mass of the object if the applied force was 20 N 2. What is the change in momentum 3. At the time given above the object is travelling towards the northwest with an angle

A small steel ball moving with speed v0 in the positive x-direction makes a perfectly elastic noncentral collision with an identical ball originally at rest. After impact, the first ball moves with speed v1 in the first quadrant at an angle theta1 with the x-axis, and the second moves with speed v2 in the fourth quadrant at an

If a metal ball strikes a pendulum and sticks to it. It will have a relationship for conservation of momentum of m*v = (m + M) *V (m and v are the mass and initial velocity of the projectile, M is the mass of the pendulum with no initial velocity and big V is the combined velocity of the pendulum and projectile). The conse

A bullet of mass 5X10^-3kg is fired from a 4kg gun with a speed of 320m/sec. With what speed does the gun recoil?

A man of 60 kg mass is stuck on a sheet of ice 10m from solid land. The coefficient of friction between the man and ice is 0.03. He has a 5 kg rock which he can throw with a speed of 12 m/s. a) Can he reach solid land by throwing the rock? b) If so, how long will it take him?

See the attached file. The oscillation period is 1.25 seconds (just in case it's hard to read)

In a football game, a receiver is standing still, having just caught a pass. Before he can move, a tackler, running at a velocity of +4.5 m/s, grabs him. The tackler holds onto the receiver, and the two move off together with a velocity of +2.6 m/s. The mass of the tackler is 115 kg. Assuming that momentum is conserved, find

A 1 kg object is dropped from the horizontal while attached to a string 80 cm long, tied at the same height as the object. When the string is vertical after the object is dropped, the object strikes a 2 kg block on a frictionless horizontal surface. The impact is 100% elastic. What will be the velocities of both objects