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A cube of wood having an edge dimension of 20.0 cm and a density of 650 kg/m3 floats on water.
(a) What is the distance from the horizontal top surface of the cube to the water level?
(b) What mass of lead should be placed on the cube so that the top of the cube will be just level with the water surface?
A hard-thrown tennis ball is moving horizontally when it bangs into a vertical concrete wall at perpendicular incidence. What are the directions of its velocity and acceleration just before hitting the wall
You measure an electric field of 1.26×106 N/C at a distance of 0.149 m. from a point charge. find the magnitude of the charge
When a charge with q=2e moves under the influence of the electric force and an external force through a potential difference of -80V, The work done by the external force is
q1. a cord is used to vertically lower an initially stationary block of mass m kg at a constant downward acceleration
A ball is thrown off the top of a building with a velocity v at an angle ? with respect to the horizontal. Find the total time of flight until the ball hits the ground
A fish swimming in a horizontal plane has velocity i = (4.00 + 1.00 ) m/s at a point in the ocean where the position relative to a certain rock is i = (14.0 ? 4.20 ) m. What are the components of the acceleration of the fish
As part of a safety investigation, two 1800 cars travelling at 18 are crashed into different barriers. Find an average forces exerted on (a) car that hits a line of water barrels and takes 1.80 to stop, and (b) car that hits a concrete barrier and ta..
A 1400kg elevator accelerates upward at 1.30m/s2 for 11.0m , starting from rest. How much work does gravity do on the elevator
Two spheres are launched horizontally from a 1.2 -high table. Sphere is launched with an initial speed of 4.5. What is the time for the sphere to hit the floor
A plane polarized EM wave propagates through a polymer. Such waves obey a similar wave equation to that found for free space. The wave has a magnetic field vector, ??=[(?1.2??)?sin(??y+??t)] ?T, with frequency ??=7.61×10^(14) Hz and wave number ??..
You have a sample of Xenon in a rectangular container. The gas exerts a total force of 58.1 N perpendicuar to one of the container walls, Calculate the pressure of your sample
Two metal rods, one silver and the other gold, are attached to each other. The free end of the silver rod is connected to a steam chamber, How much heat flows through the two rods in 60 s
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