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Two trains are traveling toward each other at a constant speedof 10 miles/hr. At the point where the trains are 20 milesapart, a fly traveling a constant speed of 30 miles/hr. flies backand forth between the trains. What is the distance the fly traveled?
One cubic meter of water flowing over Niagara Falls in New York drops 96.6 meters. how much heat energy would the water have
The centers of a 15kg lead ball and a 50g lead ball are separated by 10cm, What is the ratio of this gravitational force to the weight of the 50g ball
A soccer ball is kicked with the initial speed of 10.8 m/s . After 0.720 s it is at its highest point. What was its initial direction of motion
A 1kg mass hangs from a cord wrapped around a solid disk pulley with a mass of 3kg and radius 25cm. Find the acceleration of the mass as it drops and the cord unwinds
A tabletop gamer has designed a game that requires three dice to be thrown onto a tray with a measurement grid. To add an extra degree of randomness, the coordinates of the center of mass of the three dice are used as well
The magnitude of earth's magnetic field is 50.0 µT and makes an angle of 30° with the plane of the coil. Assume a patient takes 1.50 s to inhale, find the magnitude of average induced emf in the coil during that time.
A high-speed flywheel in a motor is spinning at 450rpm when a power failure suddenly occurs. The flywheel has mass 40.0kg and diameter 80.0cm. At what rate is the flywheel spinning when the power comes back on
a cd has a mass of 17 g and a radius of 6.0 cm. when inserted into a player the cd starts from rest and accelerates to
A satellite with a mass of 750 kg is in orbit around the earth. It is initially located at the altitude (measured from the earth's surface) of 2.12 x 106 m. It is then moved into a new orbit, with an altitude of 4.25 x 10^6 m (again, measured from..
A carefully designed experiment can measure the gravitational force between masses of 3 kg. Given that the density of iron is 7860 kg/m3, what is the gravitational force between two 3.00-kg iron spheres that are touching?
A 5.0-kg projectile is fired over level ground with a velocity of 200.0 m/s at an angle of 30.0 degg above the horizontal. Over the entire trip the work done by the air forces is
You, Archimedes, suspect that the king's crown is not solid gold but is instead gold-plated lead. To test your theory, you weigh the crown, and find it to weigh 60.0 N, What percentage (by weight) of this crown is made of gold
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