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You have a 120g meterstick. A) Where should you place the meterstick atop your finger so it balances? (Express your answer to two significant figures and include the appropriate units.) B) Where's the balance point if you place an additional 150 mass at the 20- mark and a 350 mass at the 80- mark? (Express your answer to two significant figures and include the appropriate units.)
After a 0.250-kg rubber ball is dropped from a height of 1.80 m, it bounces off a concrete floor and rebounds to a height of 1.20 m. (a) Determine the magnitude and direction of the impulse delivered to the ball by the floor. magnitude? direction?
A horizontal block-spring system with the block on a frictionless surface has total mechanical energy E = 39.1 J, What is the kinetic energy of the system at the equilibrium point
A tetrahedron has an equilateral triangle base with 18-cm-long edges and three equilateral triangle sides. The base is parallel to the ground, What is the electric flux through the base
A brick is thrown vertically upward with an initial speed of 4.90 m/s from the roof of a building. If the building is 98 m tall, how much time passes before brick lands on the ground.
Two gerbils run in place with a linear speed of 0.55 on an exercise wheel that is shaped like a hoop. Find the angular momentum of the system
A railway car moves past you at high speed. According to an observer riding on the railway car, a clock at the front of the car is synchronized with an identical clock at the rear of the car.
What must the charge (sign and magnitude) of the particle of mass 1.42 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 650 N/C.
Two equally charged, 1.00 {rm g} spheres are placed with 2.00 {rm cm} between their centers. When released, each begins to accelerate at 225 {rm m/s^2}. What is the magnitude of the charge on each sphere.
To fight a fire on the fourth floor of a building, firefighters want to use a hose of diameter 6.31cm to shoot 925 liters/minute of water to a height of 11m, What pressure must the water have inside the hose
A particle has a de Broglie wavelength of 2.7x10-10 m. Then its kinetic energy doubles. What is the particle's new de Broglie wavelength, assuming that relativistic effects can be ignored
Two people with a combined mass of 123kg hop into an old car with worn-out shock absorbers. Find the total load supported by the springs
Two identical pucks are on an air table. Puck A has an initial velocity of 4.0 m/s in the positive x-direction. What is the speed and direction of puck B after the collision
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