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Calculate the final equilibrium temperature, assuming no heat is lost to outside the water. Imagine now that one tried to repeat the same measurement, but between the time that the 470 cm3 of water was measured at 82°C and the time it was mixed with the 95 cm3 of water at 8°C, the warmer water had lost 2820 cal to the environment. Calculate the final equilibrium temperature assumning no heat loss after mixing occurs.
In coming to a stop, car leaves skid marks 78 long on the highway. Assuming a deceleration of 7.1 estimate the speed of the car just before braking.
A playground merry-go-round has radius 3-{rm m} and moment of inertia 3000-{rm{ kg}} cdot {rm{m}}^2 about a vertical axle through its center, and it turns with negligible friction.
A 200, 47.0 cm-diameter turntables rotate on frictionless bearings at 70. A 24.0 block sits at the center of the turntable. A compressed spring shoots the block radically outward along the frictionless groove in the surface of turntable.
A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 37.0kg and diameter 71 cm. The power is off for 27.0s and during this time the flywheel slows due to friction in its axle bearings...
Objects with masses of 145kg and a 445kg are separated by 0.330m. At what position (other than infinitely remote ones) can the 32kg object be placed so as to experience the net force of zero.
What must the charge (sign and magnitude) of a 1.43 g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 630.
compute the magnitude of the magnetic force exerted on it.
The bullet remains in the block, and after the impact the block lands d = 1.90 m from the bottom of the table. How much time does it take the block to reach the ground once it flies off the edge of the table.
If the car is going 55m/s, how many meters will it travel before it stops? How many meters will it takes to stop car going twice as fast.
The loaded cab of an elevator has a mass of 3.0 x 10^3 kg and moves 145 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab.
At one instant a bicyclist is 50 m due east of a park's flagpole, going due south with a speed of 9 m/s. Then, 24 s later, the cyclist is 45 m due north of the flagpole, going due east with a speed of 20 m/s. For the cyclist in this 24 s interval,..
Two people are holding up the ends of a 4.75-kg wooden board that is l = 2.00 m long. A m = 3.00-kg box sits on the board, 0.50 m from one end. What forces do the two people exert.
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