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Conservation of Momentum

Speed of bullet

A bullet of mass 0.1kg is fired into a block of mass 10kg initially at rest at the edge of a frictionless table of a height 2m. The bullet remains in the block and after impact the block lands a distance d from the bottom of the table. Use the attached figure to solve the following: a) find the distance d b) the speed of

Velocity of fragments after an explosion

A rocket is fired vertically upward. At the instant it reaches the highest point, it explodes into three fragments having equal mass. One fragment move upward with a speed of 450 m/s following the explosion. The Second fragment has a speed of 300 m/s and is moving east right after the explosion. provide all work. a) What is t

The Principle of Conservation of Linear Momentum

By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with v1 = 2.90 m/s and v2 = 1.65 m/s. As the plate falls, its momentum has only a vertical component, and no component parallel to the floor. After the collision, the component of the total momentum parallel to the flo

Velocities After Collision In One Dimension

A 1055 kg van, stopped at a traffic light, is hit directly in the rear by a 770 kg car traveling with a velocity of +2.30 m/s. Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is the final velocity of each vehicle?

Questions on Phenomenon of Physics

Physics Test 2 ______1. In which one of the following situations will there be an increase in kinetic energy? a. A projectile approaches its maximum height. b. A box is pulled across a rough floor at constant speed. c. A child pushes a merry go round causing it to rotate faster. d. A satellite travels in a circular or

Elastic collision problem

A ball with mass M moving horizontally at 5m/s collides elastically with a block with mass 3M. The block is initially hanging at rest from the ceiling at the end of a .50m wire. What is the maximum angle the block will swing after it is hit?

Problems on Collision and Kepler's Laws of Planetary Motion

1) In a certain road accident, a car of mass 1500 kg, traveling south, collided in the middle of an intersection with a truck of mass 7500 kg, traveling west. The vehicles locked and skidded off the road along a line pointing almost exactly southwest. A witness claimed that the truck had entered the intersection at 55 mph. Do y

Finding the knetic energy of a sphere

Consider a sphere of radius R and mass M rolling without slipping. Which form of kinetic energy is larger, translational or rotational? Translational kinetic energy is larger. Rotational kinetic energy is larger. Both are equal. You need to know the speed of the sphere to tell.

Conversion of Linear Momentum in Rocket Propulsion.

An astronaut drifts away from an orbiter while repairing an antenna. The astronaut realizes the orbiter is moving away from him at 3m/s. The astronaut and his maneuvering unit have a mass of 100 kg.which includes a pressurized tank of of mass 10 kg. The tank contains only 2 kg of gas, in addition to the mass of the tank, that is

Impulse and Momentum

QUESTION#1 A 1.0-kg ball has a velocity of 12 m/s downward just before it strikes the ground and bounces up with a velocity of 12m/s upward. What is the change in momentum of the ball? Question#2 A 0.1-kg steel ball is dropped straight down onto a hard horizontal floor and bounces straight up. Its speed just before

Impulse and Momentum

See attached file for full problem description. 1. A 4.0-kg block slides along a frictionless surface with a constant speed of 5.0 m/s. Two seconds after it begins sliding, a horizontal, time-dependent force is applied to the mass. The force is removed eight seconds later. The graph shows how the force on the block varies wit

projectile and block collision

A 0.150 kg projectile is fired with a velocity of 715 m/s at a 2.00 kg wooden block that rests on a frictionless table. The velocity of the block, immediately after the projectile passes through it, is 40.0 m/s. What is the velocity with which the projectile exits from the block?

speed of wagon after 10% of its mass is dropped

A wagon is coasting at a speed Va along a straight and level road. When ten percent of the wagon's mass is thrown off the wagon, parallel to the ground and in the forward direction, the wagon is brought to a halt. If the direction in which this mass is thrown is exactly reversed, but the speed of this mass relative to the wagon

Ratio of Ice Skater Masses

Two ice skaters have masses m1 and m2 and are initially stationary. Their skates are identical. They push against one another and move in opposite directions with different speeds. While they are pushing against each other, any kinetic frictional forces acting on their skates can be ignored. However, once the skaters separate,

Al's mass

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

Physic Problems

1. In a college homecoming competition, 16 students lift a sports car. While holding the car off ground, each student exerts an upward force of 400 N. (a) What is the mass of the car in kilograms? (b) What is its weight in pounds? 2. A person pushes on a block of wood that has been placed against a wall. Draw a free-body diagra

Lagrange Equations and Integrals of the Motion of the Hoop

A hoop of mass m and radius R rolls without slipping down an inclined plane of mass M, which makes an angle A with the horizontal. Find the Lagrange equations and the integrals of the motion if the inclined plane can slide without friction along a horizontal surface.

Elastic collission of two glass marbles

Two glass marbles moving along a straight line toward each other undergo an elastic collision. The speed of one marble is 2v and its mass is m; the speed of the other marble is v and its mass is 2m. What are the speeds and directions of the marbles after the collision?

Finding the Recoil Speed

A 78-kg ice hockey player standing on a frictionless sheet of ice throws a 6.0-kg bowling ball horizontally with a speed of 3.0 m/s. With what speed does the hockey player recoil? I need to see each step and formula to solve this question.

Three disks are spinning independently on the same axle without friction. Their respective rotational inertias and angular speeds are specified. The disks then slide and stick together, forming one piece with a single angular velocity. To determine the direction and the rate of rotation of the single piece?

Three disks are spinning independently on the same axle without friction. Their respective rotational inertias and angular speeds are I, w (clockwise); 2I, 3w (counterclockwise); and 4I, w/2 (clockwise). The disks then slide together and stick together, forming one piece with a single angular velocity. What will be the directio

Conservation of Angular Momentum of a Large Turntable

A large turntable rotates about a fixed vertical axis, making one revolution in a time of T. The moment of inertia of the turntable about this axis is I. A child with a mass of m, initially standing at the center of the turntable, runs out along a radius. What is the angular speed of the turntable when the child is a distance

Newton's 3rd Law.

Newton's 3rd Law 1) The two forces in each pair may have different physical origins (for instance, one of the forces could be due to gravity, and its pair force could be a normal contact force). True / False? 2) The two forces of a 3rd law pair always act on different bodies. True / False? 3) Given that two bodies in

Motion In A Plane:Projectile with explosion at the top

A projectile that is fired from a gun has a initial velocity of 90.0 km/h at an angle of 60d above the horizontal. When the projectile is at the top of its trajectory, an internal explosion causes it to separate into two fragments of equal mass. One of the fragments falls straight downward as though it had been released from res

Rotational Forces - Spaceship

A space station shaped like a giant wheel has a radius of 105 m and a moment of inertia of 5.03 108 kgm2. A crew of 150 are living on the rim, and the station's rotation causes the crew to experience an apparent free-fall acceleration of g (Fig. P10.44). When 100 people move to the center of the station for a union meeting, the

Collisions.

Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why? Many people imagine that the collision force exerted on the car is much greater than that experienced by the truck. To substantiate this view, they point out that th

Force, Collision and Conservation of Linear Momentum

A car (m1) is traveling at a velocity (v1) and it smashes into a wall. In situation 1: the car bounces off in a completely elastic collision with no change in speed. In situation 2: the car stops by inelastic collision. Which situation would be the most dangerous. Why? ----------------------------------------------------------

Physics

A 45.5 kg girl is standing on a plank that has a mass of 143 kg. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless supporting surface. The girl begins to walk along the plank at a constant speed of 1.41 m/s relative to the plank. (a) What is her speed relative to the ice surface?

Skeet shooting maximum height

A 0.250 kg skeet (clay target) is fired at an angle of alpha = 32.6o to the horizon with a speed of v0 = 29.3 m/s, as seen in figure below. When it reaches the maximum height, it is hit from below by a 15 g pellet traveling vertically upward at a speed of v = 186 m/s. The pellet is embedded in the skeet. How much higher did t

Mechanics: Perfectly Inelastic Collision

A) One lump of clay traveling at 27 m/s overtakes a second lump traveling at 5.6 m/s. After collision they are stuck together. To the nearest tenth of a m/s what is their common velocity? B) If the second lump in the above problem was moving in the opposite direction before the collision what would be the answer?