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A 5 kg block, measuring 10 cm per side, is held 50% submerged in water by a helium balloon. If the density of air is 1.18 g/L, helium is 0.164 g/L, and water is 1000 g/L, what is the diameter of the balloon?
A small piece of dust of mass m = 1.50g travels horizontally through an electric air cleaner in which the electric field is 498N/C. The electric force on the particle is equal to weight of the particle.
How much kinetic energy will an electron gain (in joules) if it accelerates through a potential difference of 1.30×104V
Two children stand on opposite sides of a merry-go-round of diameter 6.0 m, Calculate the magnitude of the Coriolis force acting on the moving ball due to the rotation of the merry-go-round
A weight lifter raises a 972 N weight a vertical distance of 1.87 m. Compute the work done by the force exerted on the weight by the weight lifter
How much energy is stored in a 11.2mH inductor carrying a 1.45A current? Solve for mJ
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.40 10-4 m3 and its mass is 3.87 kg. a) What mass of gold is in the rock? b) What percentage of the rock is gold by volume? c) What percentag..
By how much does the potential energy of a 15.0-kg child increase. Find v0.
The Pulse frequency of a person is 90 beats/min, Find the power of heart if the density of mercury is 13.6 X 10^3 kg/m^3 (g=10 m/s^2)
A 9300 kg boxcar traveling at 20m/s strikes a second boxcar at rest. The two stick together and move off with a speed of 10 m/s. What is the mass of the second car.
find the initial velocity of the ball. An echo is heard in 3 sec after the emission of sound. If speed of sound in air is 342 m/s, what is the distance of the reflecting surface from the source.
In a darkened room we place a lighted tungsten bulb in a box that has one end covered with tinfoil. If we make a pinhole in the tinfoil, an image of filament appears on a screen facing the tinfoil.
If the rocket gases are expelled at a speed of 2010 m/s, explain how much mass must be expelled?
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