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you are working on Millikan apparatus and have an oil droplet that the has mass of 0.82ng. Assuming that there are 100 electrons stripped off the droplet and the plates are separated by 2.0cm, determine:
a.) the electric field ( magnitude and direction) required to support the drop
b.) The voltage required to support the drop
When a 0.058 kg tennis ball is served, it accelerates from rest to a speed of 45.0 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 0.440 m. What is the magnitude of the net force acting on the ball?
Let us assume that velocity of a pilot just before he starts to decelerate is 54 m/s downwards, and that pilot's displacement is 3.00 m (downwards) as he decelerates to a halt. From the given info, we want to find deceleration experienced by the pilot as he falls through tree branches and snow.
What is the most suitable kinematics equation we can use to solve this problem?
For a person whose weight in water is 2.8% of the weight in air, what is that person's % body fat? The density of fat is rf = 0.90 g/cm3, and the density of muscle is rm = 1.06 g.cm3. Assume that the mass of the person is the sum of fat mass mf and muscle mass mm. The density of water is rw = 1.0 g/cm3.
A resistor is made of carbon wire (resistivity of 3.00*10^-3 Ohm meters) that has a cross-sectional area of 2.00*10^-7 meters squared and a total length of 1.0m. This resistor is placed in series with a full-charged capacitor C=100mF, and the capacitor is allowed to discharge through the resistor. How long does it take the capacitor's charge to drop to 90% of its original value.
A 0.220-kg piece of aluminum that has a temperature of -171 °C is added to 1.1 kg of water that has a temperature of 1.8 °C. At equilibrium the temperature is 0 °C. Ignoring the container and assuming that the heat exchanged with the surroundings is negligible, determine the mass of water that has been frozen into ice.
In 1923, the United States Army (there was no U.S. Air Force at that time) set a record for in-flight refueling of airplanes. Using two refueling planes, an Airco DH-4B biplane was able to remain in flight for 36 hours. During the flight, the refueling planes were able to air-transfer a total of 687 gallons of fuel to the plane in 9 refueling transfers. Assume that the refueling nozzle had a diameter of 1.55 inches and each refueling took 2.33 minutes to perform. Calculate the velocity of the fuel through the nozzle. Assume that the fuel filled the entire cross-sectional area of the nozzle.
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