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What is the charge of ions formed from atoms of Ca? What is the charge of ions formed from atoms of P?
An airplane propeller is 2.05m in length (from tip to tip) with mass 122 kg and is rotating at 2200 rpm (rev/min) about an axis through its center. You can model the propeller as a slender rod.
300. V are applied to a motor with a windings resistance of 65.0 ohms. At the maximum motor speed the back emf is 155. V. Find the current in windings as the motor starts
A ball is thrown and hits a wall with velocity Vo, and bounces off the wall with velocity Vf... Given contact time, what is the avg force acting on the ball
A person carries a long pole of mass 10kg and length 3.40 m at the angle of 60 degrees. Find the magnitude of the torque on the pole by reason of gravity.
The eyepiece of a compound microscope has a focal length of 2.80 centimeter, and the objective lens has f = 0.720 centimeter. Find the distance between the lenses when the microscope is adjusted for a relaxed eye
For safety, the National Electrical Code limits the allowable amount of current which such a wire may carry. Find how much power would be dissipated in the wire, when carrying the maximum allowable current
An object is placed in front of a concave mirror with a 21.4-cm radius of curvature. At what distance is the object from the mirror
In 1898, Pierre & Marie Curie isolated about 10mg of radium-226 from eight tons of uranium ore. How many radium nuclei would have decayed during this time
The two wires of length 2 m are 3 mm apart and carry a current of 10 A dc. Calculate the force between these wires
radiation from the head is a major source of heat loss from the human body. model a head as a 20-cm-diameter 20-cm-tall
The isotope of lithium used in a hydrogen bomb is Li-6, whose nucleus contains 3 protons and 3 neutrons. When a Li-6 nucleus absorbs a neutron, a nucleus of the heaviest hydrogen isotope, tritium (H-3), is produced.
question a light bulb radiates an electromagnetic wave in all directions with a total power of 100 watts. if you stand
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