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If a point charge of -30 mC experiences an electrostatic upward force of 27 mN at a certain location in the laboratory, find the magnitude and direction of electric field at that location?
In the Millikan oil-drop experiment, Estimate the radius of an oil drop of density 839 kg/m3 for whichits weight could be balanced by the electric force of this field on one electron
Calculate the average density of a red giant star in grams per cubic centimeter. Take the star's mass to be 2*10^33 gm and its radius to be 3*10^12 cm
How does the strength of the magnetic field 1 cm from a current-carrying wire compare with? The strength of the field 2 cm from the wire?
An engine absorbs 1.69 kJ from a hot reservoir at 277°C and expels 1.22 kJ to a cold reservoir at 27°C in each cycle. (a) What is the engine's efficiency? % (b) How much work is done by the engine in each cycle? J (c) What is the power output of the ..
What is change in electrical potential energy of electron
A growing plant creates a highly complex and organized structure out of simple materials such as air, water, and trace minerals. what is the plant's ultimate source of energy
A microscope with a tube length of 200 mm achieves a total magnification of 800x with a 40x objective and a 20x eyepiece. How far is the sample from the objective lens
A line in the x-ray spectrum of gold has a wavelength of 18.5 pm(=18.5x10^12 m), What is the energy of the lower stationary state
A beam of nuclei is used for cancer therapy. Each nucleus has an energy of 190 MeV, and the relative biological effectiveness (RBE) of this type of radiation is 16. How many nuclei are in the beam
A 10 gram bullet is fired into a ballistic pendulum made froma 4 kg wood block and two light cords. The block’s vertical displacement is 5 cm. What is the initial velocity of the bullet ? What percentage of the bullet’s initial kinetic energyis lo..
At 3.831 kHz the reactance in a circuit of a 3 mF capacitor and an inductor are equal in magnitude. What is the value of the inductor
A jet with mass m = 50000.0 kg jet accelerates down the runway for takeoff at 1.7 m/s2. What is the net horizontal force on the airplane as it levels off
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