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A skater of mass 81.5 kg initially moves in a straight line at a speed of 4.70 m/s. The skater approaches a child of mass 44.0 kg, whom he lifts on his shoulders. Assuming there are no external horizontal forces, what is the skater's final velocity?
a 150g bullet is fired from a rifle with a barrel of length 65cm the bullet starts from rest at one end of the barrel, find the speed of the bullet as it leaves the rifle
An airplane is flying with a speed of 305 km/h at a height of 3750 m above the ground. How much energy was dissipated on the parachute by the air friction
The rear axle of a truck is 2.5 m long. If the truck is moving at 28 m/s, what emf is induced between the ends of the axle
What is the magnification of an astronomical telescope whose objective lens has a focal length of 71 cm and whose eyepiece has a focal length of 2.1 cm
how to calculate the average velocity between to minutes. Estimate how for you can throw a ball if you throw it in the following situations.
What is the angular momentum of a 3.2 kg uniform cylindrical grinding wheel of radius 12cm while rotating at 1400 rpm.
Two metal rods, silver and copper, are attached to a steam chamber with a temp 100 C, at one end and an ice bath ( 0 C ) at the other end. How much heat flows through the two rods in 60s
An infinitely long line of charge has linear charge density 4.00 10-12 C/m. A proton (mass 1.67 10-27 kg, charge +1.60 10-19 C) is 17.0 cm from the line and moving straight toward the line at 3000m/s.
Calculate the increase in internal kinetic energy (that is, for the ship and the shell). This energy is less than the energy released by the gun powder-significant heat transfer occurs
Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. How much energy is stored in the flywheel
A proton is moving along the axis of a uniformly charged thing ring of 20nC/cm. The radius of the ring is 5cm. what initial speed does it need to be able to cross the plane of the ring
A ball of mass 0.113 kg is dropped from a height of 1.92m above ground. The acceleration of gravity is 9.8m/s^2.Neglecting air resistance find the speed of the ball when it is at a height of 0.812 m above the ground. Answer in units of m/s.
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