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1. Your nephew swings a rock around his head on a massless string. If the string is 1.5 m long and is 12?degrees from the vertical, what is the period of the rock?
2. A van drives at a steady speed in a circle. Inside the van, your nephew has hung a rock from a massless string attached to the ceiling of the van. Explain why the string hangs at an angle, and work out a formula for this angle.
A projectile is shot vertically from the surface of the Earth. Calculate the final speed of the projectile
The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30 caliber bullet has mass 7.20×10?3kg, Find the momentum of the propellant gases in a coordinate system attached to the earth as they leave the muzzle of the rifl..
How far did you travel on this trip? What was your average speed.
Starting from rest, a 1.8 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, What is the flea's speed when it leaves the ground
Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium
Three uniform spheres are located at the corners of an equilateral triangle. Each side of the triangle has a length of 1.00 m. compute the magnitude of the initial acceleration of the third sphere
Assume that we suddenly discovered that all these years we would be wrong about the distance from Earth to the Sun, and it is actually 10 percent greater than we would think. How would that affect our approximation of the distance to the Andromeda..
A 10.0-g bullet is fired from a rifle having a barrel 0.60 m long. Choosing the origin to be at the location where the bullet begins to move, Find the speed of the bullet as it leaves the barrel
You have two coils and want to determine their mutual inductance. You do a quick measurement, What is the mutual inductance
Two point charges q_1 = 2.10 nC and q_2 = -6.10 nC are 0.100 {rm{ m}} apart. Point A is midway between them; point B is 0.080 {rm{ m}} from q_1 and 0.060 {rm m} from q_2 Take an electric potential to be zero at infinity.
A beam of light is traveling in air and strikes a material. The angles of incidence and refraction are 56.1° and 48.5°, respectively
The sun produces energy by nuclear fusion reactions, in which matter is converted into energy. How many kilograms of matter does the sun lose each second
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