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A star of radius 1 × 10^6 km rotates about its axis with a period of 48 days. The star undergoes a supernova explosion, whereby its core collapses into a neutron star of radius 12 km. Estimate the period of the neutron star (assume the mass remains constant).
Answer in units of s
A bullet of mass 11.1 g is fired into an initially stationary block and comes to rest in the block. How much kinetic energy is lost
A thin spherical shell has a radius of 2.8 m and a mass of 270 kg, and its center is located at the origin of a coordinate system. Another spherical shell with a radius of 1 m and mass 100 kg is inside the larger shell with its center at 0.6 m on the..
A resistor with R=300 ? and an inductor are connected in series across an ac source that has voltage amplitude 500 V. What is the power factor
A sailboat on the ocean has a mast of height 18.5 m. When viewed through a pair of binoculars the mast has an angular size of 0.065 rad. what is the distance between the observer and the sailboat
A jet flying at 136 m/s banks to make a horizontal circular turn. Calculate the magnitude of the necessary lifting force
A 65 kg high jumper starts his push-off phase with his center of mass .45 m above groung and velocity of 0 m/s. How much work did the mat do on the high jumper
A weightlifter bench-presses a 170.0 kg barbell from his chest to a height equal the length of his arms 0.750 m. What is the potential energy of the barbell relative to the weightlifter\'s chest after he lifts the barbell
Two toy locomotives approach each other along the same line, and upon collision both stop dead still. What is the mass of the faster locomotive
A 68-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.11. What would be the magnitude of acceleration.
A glass soda bottle is emptied of soda and filled to the very top with water. A cork is carefully fitted into the top of the bottle, leaving no air between the cork and the water.
write down the equations expressing conservation of momentum for the components in the x and y directions separately.
A solid sphere has a temperature of 628 K. The sphere is melted down and recast into a cube that has the same emissivity and emits the same radiant power as the sphere. What is the cube's temperature?
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