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A star rotates with a period of 30 days about an axis during its center. The period is the time it takes a point on the star's equator to make one complete revolution around the axis of rotation. After the star undergoes a supernova explosion, the stellar core, which had a radius of 1.0 x 10^4 Km collapses into a neutron star of radius 3.0 Km. what is the new period of rotation of the star?
A small object of mass 0.025 kg and charge 2.5 µC hangs from the ceiling by a thread. Find the tension in the thread
The place you get your hair cut has two nearly parallel mirrors 7.0 apart. As you sit in the chair, your head is 1.5 from the nearer mirror. How far away does the back of your head appear to be
A car of mass 2200 kg collides with a truck of mass 4800 kg, and just after the collision the car and truck slide along, stuck together. The car's velocity just before the collision was m/s, and the truck's velocity just before the collision was..
A weightlifter's barbell consists of two identical spherical masses each by radius 0.17m and mass of 50 kg. The weights are linked by a 0.96-m steel rod with mass of 12kg. Discover the moment of inertia of the barbell during the axis at the center.
A child in a boat throws a 5.20 kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.0 kg and that of the boat is 40kg.
Two waves are traveling in the same direction along astretched string. Each has an amplitude of 4.0cm, assume the wavesare 45o out of phase. What is the amplitude of the resultant wave
A simple harmonic oscillator is constructed from a spring which is connected to a mass of 0.3 kg. What is the total energy of the oscillation
Consider a block of mass m sliding down an inclined plane andit has three forces acting on it (1) a gravitational force(pointing down). (2) a normal force perpendicular to the surface ofthe plane. (3) a friction force opposing motion down the plan..
A massless spring with spring constant 22.10 N/m hangs vertically. A body of mass 0.280 kg is attached to its free end and then released. Assume that the spring was unstretched before body was released. How far below the initial position does the ..
A log is floating on swiftly moving water. A stone is dropped from rest from a 72.0-m-high bridge and lands on the log as it passes under the bridge. what is the horizontal distance between the log and the bridge
a hot-air balloon is ascending at the rate of 11 ms and is 59 m above the ground when a package is dropped over the
A boy pulls a box of mass 30 kg with a force of 25 Nin a direction from left to right. What is the normal force exerted on the box by the ground
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