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A freight car with a mass of 2500 kg rolls down an inclinedtrack through a vertical distance of 1.5m. at the bottom of theincline, on a level track, the car collides and couples with anidentical freight car that was at rest. What percentage of the initial kinetic energy is lost in the collision?
To balance a very light rod when a down force is applied at a point 0.77m to the left of a supporting fulcrum (pivot point), What is the magnitude of the downward force
a pure sample of atomic gas has atoms with six principal quantum numbers that can yield several emission lines. what is
Using Faraday's Law, derive the self-inductance per unit length of a long (ideal) solenoid with n turns per unit length, and of radius R. How much energy is stored in this solenoid
On the planet Zardem, the standard unit of time is the Zarsec, or Zs, where 1 Zs = 2.2s. how fast is the runner traveling
As part of a circuit act, a person drives a motorcycle with constant speed v around the inside of a vertical track of radius r. find the normal force exerted on the motorcycle by the track
two charges are placed between the plates of a parallel plate capacitor. one charge is q1 and the other is q2 7.21c.
A pilot wishes to fly due east. If the planes maximum speed is 683 km/hr and there is a 21.4 km/hr wind from the north, what must the planes velocity be in order to fly due east
consider the daughter of radon 222 through alpha decay. a sample which initially contained 10 moles of this daughter
A helicopter is ascending vertically with a speed of 5.73m/s . At a height of 114m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the hel..
What is an average acceleration of the dragonfly
A 7 kg bowling ball strikes a 2 kg pin. The pin flies forwardwith a velocity of 6 m/s the ball continues forward at 4 m/s. What was the original velocity of the ball
A point mass m starts from rest and slides down the surface of a frictionless solid sphere of radius r. Find the angle at which the mass flies off the sphere
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