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A metal ball tied to the end of a string 1.8 m long is whirled in a horizontal circle at 4 m/s. What is the mass of the ball if the tension on the string is 30 N?
What formula/s should I use?
what is the magnitude of magnetic force per unit length on a wire carrying a current of 8 a and making an angle of
A pot with a steel bottom 8.50mm thick rests on a hot stove. The area of the bottom of the pot is 0.150m^2. Find the temperature of the lower surface of the pot
Suppose that the sound level of a conversation is initially at an angry 74 dB and then drops to a soothing 50 dB. Assuming that the frequency of the sound is 516 Hz, determine the (a) initial and (b) final sound intensities (in ?W/m2) and the (c) ..
A second oil is then poured into the right arm until the two levels are even. A small object (density 0.640 g/cm3 ) is dropped into the second column of oil and it is found to float with 20.0% of its volume above the surface.
Planet Z is 12,000 km in diameter. The acceleration due to gravity on Planet Z is 7.0 m/s2.
2 moles of an ideal gas is allowed to expand from 0.002 m^3 to 0.02 m^3 while the pressure is held at 325000 pascals. Determine the net heat flow in or out of the system
Consider a regular hexagon of side length, L = 10cm. A charge, Q = 2µC, is located at each vertex, Find the electric field vector at the center
When a battery is connected to a 145?? resistor, the current is 3.27A. Find the internal resistance of the battery and the emf supplied by the battery
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 4.72 x 105 N. What is the work done on the jet by the catapult
Light wavelength is 510 nm is directed at a double slit, where the distance between the slits is 450 micrometers. What is the intensity of the central maximum
Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 7.0 g.Silver has 47 electrons per atom, and its molar mass is 107.87g/mole.
A sample of dry air has an initial pressure p1 = 1000 hPa and temperature T1 = 300K. It undergoes a process that takes it to a new pressure p2 = 500 hPa with unchanged temperature T2=T1. Calculate the mechanical work per unit mass performed with the ..
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