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Q. A coffee filter of mass 1.1 grams dropped from a height of 1 m reaches the ground with a speed of 0.5 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter? Start from the Energy Principle, and choose as the system the coffee filter, the Earth, and the air.
Q. A railroad freight car weighing 282 kN and traveling at 1.51 m/s overtakes one weighing 211 kN and traveling at 0.914 m/s in the same direction. The cars couple together. Find the speed of the cars after collision.
A uniform horizontal wire with a linear mass density of 0.50 g/m carries a 1.8 A current. It is placed in a constant magnetic field with a strength of 4.00 x10-3 T. The field is horizontal and perpendicular to the wire. Neglect the magnetic field ..
A cylinderical water tank of radius 10ft and height 30ft is half filled with water. How much work is essential to pump all of the water out through a hole in the top of tank.
How various g's of acceleration does the astronaut experience when the device is rotating at top speed? Each 9.80 m/s^2 of acceleration is 1 g.
The period of oscillation of an object in a frictionless tunnel running through the Earth is 84.3 min. What is the time of oscillation of an object in a similar tunnel on the Moon.
A train is travelling up a 4.0 incline at the speed of 3.25 when the last car breaks free and begins to coast without friction. How long does it take for the last car to come to rest momentarily.
Runner A is at first 6.60 km west of a flagpole and is running with a constant velocity of 6.4 km/h due east. Runner B is firstly 7.20 km east of the flagpole and is running with a constant velocity of 8.80 km/h due west.
To estimate the muzzle speed of a blow dart, fire dart straight up into the air and time how long it takes to come back down. Roughly half of that time is the time for object to decelerate from its initial velocity to motionless. Estimation the in..
A meter stick, sitting on a frictionless table top, is struck by a wad of clay with a force, F = 4.0 N at an angle. The meter stick will rotate in the plane of the table. Conclude the magnitude of the torque about the axis of rotation located at t..
The height of a helicopter above the ground is given by h = 3.00 t3, where h is in meters and t is in seconds. After 2s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground.
In order for Sasha (in A-5) to feel weightless at the top of the ride, a) at what linear speed must the Ferris wheel tum? b) At this speed, how much would she appear to weigh at the bottom of the Ferris wheel.
What mass (in grams) of steam at 100°C should be mixed with 257 g of ice at its melting point, in the thermally insulated container, to produce liquid water at 84.0°C.
The truck slows down uniformly with an acceleration of 5.60 m/s2 for 4.20 s, making skid marks 62.40 m long that end at the tree. With what speed does truck then strike the tree.
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