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A 52.6-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2.29 m/s. Her hands are in contact with the wall for 1.26 s. Ignore friction and wind resistance. Find the average force she exerts on the wall (which has the equal magnitude, but opposite direction, as the force that the wall applies to her). Note that this force has direction, which you must indicate with the sign of your answer.
Between 1911 and 1990, the top of the leaning bell tower at Pisa, Italy, moved toward the south at an average rate of 1.2 mm/y. The tower is 55 m tall. In radians per second, what is the average angular speed of the tower's top about its base?
A scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. what will the volume of the lungs be (in liters) at the surface
Infrared spectra are used by chemists to help identify an unknown substance. Atoms in a molecule that are bound together by a particular bond vibrate at a predictable frequency, and light at that frequency is absorbed strongly by the atom.
What is the frequency heard by a person driving 62.41 km/h toward a blowing factory whistle (f = 425.84 Hz) is the air temperature is 20.03 oC
A fast, measured pitched baseball left the pitcher's hand at aspeed of 40.0 m/s. How much time did it take him to pitch it
A 30 g ball of clay traveling east at 2.0 m/s collides and sticks together with a 30 g ball of clay traveling north at 4.0 m/s. What is the speed of the resulting ball of clay
q1. for safety in climbing a mountaineer uses a nylon rope that is 69 m long and 1.0 cm in diameter. whilst supporting
a girl throws a rock horizontally with a velocity of 10 ms from a bridge. it falls 20 m to the water below. how far
Two capacitors, C1 = 6.00 µF and C2 = 14.0 µF, are connected in parallel, and the resulting combination is connected to a 9.00-V battery. (a) Find the equivalent capacitance of the combination.
A series AC circuit contains a resistor, an inductor of 220 mH, a capacitor of 6.00 µF, and a source with ?Vmax = 240 V operating at 50.0 Hz. Calculate the capacitive reactance
A rectangular block of ice 9.00 m on each side and 0.7 m thick floats in sea water. The density of the sea water is 1025kg/m3. The density of ice is 919kg/m3. How high does the top of the ice block float above the water level.
the manufacturer wishes to produce a desktop version of the machine. this requires reducing the size of the drum to a
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