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An 30-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 2.8x10^(-2) m^3 and is completely submerged under the water. The volume of the person's body that is under water is 5.9x10^(-2) m^3. What is the density of the life jacket?
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
A 2000-kg car travelling at an initial speed of 50 km/h skids to a stop with a constant acceleration. Determine the length of the skid marks
A Spacecraft with a total mass of 50,000kg is flying with a speed of 90m/s with respect to a distant planet. What is the speed of the remaining spacecraft with respect to the planet after the explosion
A hammer thrower spins with an angular velocity of 1200°/s. The distance from his axis of rotation to the hammer head is 1.2 m. What is the linear velocity of the hammer head
An oscillating LC circuit has a current amplitude of 8.00 mA, a potential amplitude of 250 mV, and a capacitance of 215 nF. What is the maximum energy stored in the capacitor
In a railroad switchyard, a 50 ton freight car is sent at 7.4 mi/h toward a 27 ton car that is moving in the same direction at 2.0 mi/h. What is the speed of the pair after they couple together
An anchor shoots an arrow with a velocity of 45 m/s at the angle of 50 degrees with the horizontal.An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up into the air at th right time and speed ..
A dockworker applies a constant horizontal force of 85.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. What is the mass of the block of ice
A bartender slides a beer mug at 1.30 m/s towards a customer at the end of a frictionless bar that is 2.0m tall. The customer makes a grab for the mug and misses, and the mug sails off the end of the bar.
an electron in an x-ray machine is accelerated through a potential difference of 1.00 X 10^4 V, What is the kinetic energy of the electron
Vector has a magnitude of 63 units and points due west, while vector B has the sasme magnitude and points due south. Find the magnitude and direction of a) A + B and b) A - B. Specify the directions relative to due west.
In an amusement park ride called The Roundup, passengers stand inside a 18.0 m-diameter rotating ring. What is the longest rotation period of the wheel that will prevent the riders from falling off at the top
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