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A helicopter is ascending vertically with a speed of 6.20m/s. At a height of 125 meter above the Earth, a parcel is dropped from a window. Compute how much time does it take for the package to reach the ground (the parcel's initial speed equivalent the helicopters).
A 150 g ball on a 60-{\rm cm}-long string is swung in a vertical circle about a point 200 {\rm cm} above the floor. The tension in the string when the ball is at the very bottom of the circle is 4.0 N.
A 0.29 F capacitor is desired. What area must the plates have if they are to be separated by a 3.7 mm air gap
Assume that each cubic centimeter of water has a mass of exactly 1.00 g. What is the mass of one cubic meter of water
A 3.2 kg bucket of water is raisedfrom a well by a rope. If the upward acceleration of the bucket is2.4 m/s2, find the force exerted by the rope on the bucket
the armature of a simple ac generator has 30 circular loops of wire each with a radius of 10 cm. it is rotated with a
question a 30-turn 11.5 cm diameter coil is placed between the pole pieces of an electromagnet. when the magnet is
Two 11-cm-diameter electrodes 0.54cm apart form a parallel-plate capacitor. What are the charge on each electrode, the electric field strength inside the capacitor
In a Compton scattering experiment, an x-ray photon scatters through an angle of 17.4° from a free electron that is initially at rest. Calculate the wavelength of the incident photon
In Rutherford’sfamous scattering experiment that led to the planetary model of theatom, alpha particles (having a charge of + 2e and a mass of 6.64 x10-27 kg) were fired toward a gold nucleus with charge of + 79e. Thealpha particle, initially very..
An open container holds 0.550 kg of ice at - 15.0 degree celsius. The mass of the container can be ignored. After how many minutes does the ice start to melt
an arbituary shape of copper holds excess charge that is in static equilibrium. In which direction does the electric field, created by the excess charge, point at an exterior portion of the copper chape
The compressor of an air conditioner draws an electric current of 20.7 A when it starts up. how much electric charge passes through the circuit
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