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You attach a meter stick to an oak tree, such that the top of the meter stick is 2.47 meters above the ground. Later, an acorn falls from somewhere higher up in the tree. If the acorn takes 0.166 seconds to pass the length of the meter stick, how high above the ground was the acorn before it fell (assuming that the acorn didn't run into any branches or leaves on the way down)?
A 67? resistor, an 9.0?F capacitor, and a 36mHinductor are connected in series in an ac circuit. Calculate the impedance for a source frequency of 300 Hz
Two point charges are located on the y axis, by these two charges on a third charge q3 = 7.50nC located at y3 = 0.350m ? and what is the direction of the net force
At a particular instant a proton is traveling in the -y direction, with speed 4105 m/s. What is the magnitude of the magnetic force on the proton
Use Ampere's Law to find the magnetic field outside a long cylindrical conductor of radius R carrying a total current I from one end to the other
A speedboat moving at 33.0 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of ?3.20 m/s2 by reducing the throttle. (a) How long does it take the boat to reach the buoy? (b)What is the velocit..
A bag of cement weighing 275 N hangs in equilibrium from three wires as suggested in the figure below. Two of the wires make angles θ1 = 56.0° and θ2 = 42.0° with the horizontal. Assuming the system is in equilibrium, find the tensions T1, T2,..
A crate of mass 12.5 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, What is the change in kinetic energy of the crate
A 6 kg mass is attached to a spring with a spring constant k=20 N/m. The spring is stretched 50 cm and released at t=0s. What is the period of the mass-spring system
a glider of 500 gr. is 10 cm. above the table at the beginning of its motion and 6 cm. above the table at the end. what is the theoretical value of kinetic energy at the bottom
A flywheel in a motor is spinning at 580 {rm rpm} when a power failure suddenly occurs. The flywheel has mass 40 {rm kg} and diameter 75 {rm cm}.
A baseball pitcher throws a baseball horizontally at a linear speed of 42.5 m/s (about 95 mi/h). find the tangential speed of a point on the "equator" of the baseball
A copper weight is placed on top of a 0.23 kg block of wood (density = 0.60 x10^3 kg/m3) floating in water. What is the mass of the copper
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