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a ball with a mass of 0.73 kg travelling at 4 m/s strikes a second ball elastically at rest with a mass of 0.47 kg what will be the veloity of both object after collision?
a boat takes 3.00 hrs to travel 25.0 km down a river then 6.00 hrs to return. how fast is the river moving
When winter arrives, the towers stay the similar distance apart and the bridge deck keeps the similar shape as its expansion joints open. When the temperature drops to -10.0°C, what is the tension in the wire? Take Young's modulus for steel to be ..
A 3.0-cm object is placed 8.0 cm in front of a mirror. The virtual image is 4.0 cm further from the mirror when the mirror is concave than when it is planar. Determine the focal length of the concave mirror
Suppose two kids get on a 4 meter long teeter-totter. The one on the right creates a CW torque of 350 Newton-meters (Nm). Quite by coincidence, when the other kid sits at 1 meter from his end they balance perfectly. How much does second kid weigh.
Pick what you think are the most reasonable choices for each parameter in the Drake equation and justify your choice. estimate the likely nearest distance to such a civilization
A helicopter is flying in a straight line over a level field at a constant speed of 5.4 m/s, How would you calculate the angle the velocity vector makes with the ground at the instant before impact
A potter's wheel -- a thick stone disk of radius 0.500 m and mass 120 kg -- is freely rotating at 50.0 rev/min. Find the effective coefficient of kinetic friction between the wheel and the rag
The following data are obtained from a Boyle's law experiment: P1 = 113 kPa, T = 300. K, V1 = 5.00 10-5 m3. Calculate the volume occupied by the gas
Investigators are researching the appearance of a strange movement of objects in what the local community considers a haunted house. how strong was the magnetic field that produced this EMF
Two cars of mass 2000 kg and 1000 kg, respectively, collide inelastically. Their velocity after impact is 4 m/s, Find the initial speed and direction of the lighter car
At what angle to the surface must a diver submerged in a lake look toward surface to see the setting Sun just all along the horizon.
A 9.0-kg box of oranges slides from rest down a frictionless incline from a height of 5.0 m, What is the coefficient of kinetic friction, µk, of the surface from A to B
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