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In a particular Millikan oil-drop apparatus, the plates are 2.25 apart. The oil used has a density of 0.845 , and the atomizer that sprays the oil drops produces drops of diameter 1.00×10?3 .What strength of electric field is needed to hold such a drop stationary against gravity if the drop contains five excess electrons?What should be the potential difference across the plates to produce this electric field?If another drop of the same oil requires a plate potential of 87.1 to hold it stationary, how many excess electrons did it contain?
A small, 200g cart is moving at 1.60m/s on an air track when it collides with a larger, 2.00kg cart at rest. What is the speed of the large cart after the collision
Water discharges from a horizontal pipe at the rate of 5.00 x 10-3 m3/s. At point A in the pipe where the cross-sectional area is 2.00 x 10-3 m2, What is the velocity of the water at point A
A parachutist of mass 50kg jumps out of an airplane at a hight of 1000m. The parachute deploys, and he hits the ground with a velocity of 5m/s. Find the average resistance on the parachutist
The amount of charge that passes through a filament of a certain lightbulb in 1.76 s is 1.63 C. Find the current in the bulb
A projectile is launched from level ground. When it lands, its direction of motion has rotated clockwise by 60 degrees. What was the launch angle.
The coefficients of friction for plastic on wood are μs = 0.50 and μk = 0.40. How much horizontal force would you want to apply to a 4.0-lb plastic calculator to start it moving from rest.
What is the range of wavelengths for FM radio (88 MHz to 108 MHz) and AM radio (535 kHz to 1700 kHz)? (answer: for FM: 2.78m to 3.4m, for AM: 176m to 561m)
A rectangular container measuring 26 cm 47 cm 59 cm is filled with water. What is the mass of this volume of water in kilograms and grams.
Two narrow slits separated by 1.0mm are illuminated by 559nm light. Find the distance between adjacent bright fringes
You are given a container with 56 g of hydrogen atoms. What is the total charge on the electrons in the container
In order to clearly read a book 24 cm away, a farsighted girl needs an image to be 35 cm from her eyes. What focal length is necessary for lens in her eyeglasses.
A small ball rolls horizontally off the edge of a tabletop that is 1.06 m high. how long was the ball in the air
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