Object explodes, conservation of linear momentum

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 ...continues

Inelastic Collision. What is magnitude and direction of final velocity?

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 ...continues

particle moves in circular path, resultant force has tangential component

A particle of mass m, initially at rest, moves in a circular path of radius r. The resultant force acting on the particle has a tangential component given by F = Kt. Express the time required for the particle to return to its starting point in terms of r, K, and m. I'm so confused on this one. So, there is an angular acclerat ...continues

Gravitational Potential Energy of a two body system gained from a loss of projectile's kinetic energy.

A projectile is given a vertical upward velocity Vo = 10000 m/sec at Earth's surface. Neglect air friction. Find the maximum distance it will achieve above the surface of Earth. Do not consider g to be constant.

Conservation of momentum

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?

Satellite's period in orbit around the sun.

An asteroid whose mass is .0002 times the mass of Earth, is in a circular orbit about the sun at a distance that is twice the earth's distance from the sun. The mass of the sun is M= 1.9E30 kilograms and the Earth-Sun distance is 1.5E11 meters. Find the period of this asteroid, in years.

Angular momentum problem with a wheel.

A constant horizontal force of 10 N is applied to a wheel of mass 11 kg and radius 0.70 m as shown in Fig. 12-31. The wheel rolls without slipping on the horizontal surface, and the acceleration of its center of mass is 0.55 m/s2. (a) What are the magnitude and direction of the frictional force on the wheel? Magnitude: _____ ...continues

Angular speed of a rod.

In Fig. 12-46, a uniform rod (length = 0.60 m, mass = 1.0 kg) rotates about an axis through one end, with a rotational inertia of 0.12 kg · m2. As the rod swings through its lowest position, the end of the rod collides with a small 0.1 kg putty wad that sticks to the end of the rod. If the angular speed of the rod just before ...continues

Buoyant force on an object submerged in a liquid in equilibrium.

To hold up a certain stationary iron anchor in air takes 200 newtons more than when it is submerged in fresh water. The density of iron is Di=7870 kg/m^3, and by definition, the density of fresh water is Dw=1000 kg/m^3. Find the weight W, of the anchor in air.

This problem is talking about rotational friction.

A constant force F is horizontally applied to a wheel with mass m and radius r. The motion of the wheel is pure rotation and the acceleration of the center of mass of the wheel is a. Find the friction f beween the wheel and the ground.