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A skier starts at the top of a hill angled at 30 degrees from the horizontal. The hill is 100 meters long. If the coefficient of friction is .2
a) how fast is he going when he reaches the bottom of the hill (Use Conservation of Energy)
b) If he immediately starts up another hill angled at 15 degrees from the horizontal, how far along this slope does he slide before stopping assuming that the coefficient of friction remains the same? A hollow ring with inside radius 25 cm. , outside radius 35 cm. weighs 1.2 kg.
On a workday the average decibel level of a busy street is 78 dB, with 100 cars passing a given point every minute. what is the decibel level of the street
A nerve fiber (axon) may be approximate as a long cylinder. what is the resistance of a 0.3-m long fiber
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. compute the final magnification of the microscope
initially a yoga ball is partially blown up and its surface area measured. afterwards it is filled completely and its
A gremlin is a tiny mythical creature often blamed for mechanical failures. Suppose for a moment that a shrewd physicist catches one such gremlin and makes it work for her instead of against her.
A series RC circuit with C = 56?F and R = 6.4? has a 25V source in it. With the capacitor initially uncharged, an open switch in the circuit is closed, What is the voltage across the resistor immediately afterward
An outfielder in baseball throws a baseball from the warning track toward homeplate with a speed of 111.83 125 ft/s at an angle of 40.1640 degrees. where does the ball land relative to homeplate
A 140-m-wide river flows due east at a uniform speed of 3.9 m/s. A boat with a speed of 7.8 m/s relative to the water leaves the south bank pointed in a direction 39o west of north. How long does it take for the boat to cross the river
Consider a dry air parcel initially at the surface (T=25 degrees celsius and p=980mb) that rises adiabatically to a final location at 900mb
A railroad car of mass 2.52 104 kg is moving with a speed of 4.06 m/s. It collides and couples with three other coupled railroad cars, How much mechanical energy is lost in the collision
A 215.0 g piece of lead is heated to 89.0oC and then dropped into a calorimeter containing 500.0 g of water that initally is at 21.0oC. compute the final equilibrium temperature of lead and water
A submarine sends a sonar signal, which returns from another ship 2.250 s later. How far away is the other ship if the speed of sound in seawater is 1,530.0 m/s
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