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A 7.5 x 10^4 W motor that is 75% efficient exerts an average force of 3.5 x 10^3 N to move a boat at a constant speed. How fast is the boat moving?
NOTE: efficiency = output/input.
Motors are rated as to their input. 7.5 x 10^4 is the power input.
The "size" of the nucleus in Rutherford's model of the atom is about 1.00 fm = 1.00E-15 m. find the electrostatic potential energy of the pair of protons
a current carrying wire of length 0.5m is at the equator. assuming that the magnetic field of the earth has a magnitude
What is the smallest capacitor needed in a computer power supply in order to produce at least 3.55 V for 0.37 seconds after the power goes off? Assume that the resistance of all the components of the computer motherboard is 6 Ohms and that the capaci..
An object that is 5.50 centimeter tall is located 36 centimeter in front of a diverging lens. Determine the image position and size
An experiment was performed where a quartz-iodine lamp was used to measure the photocurrent in microamperes in intervals of 10 nm from 400 nm to 900 nm for the voltage settings of 60, 80, 100, and 120V.
A photon with a wavelength 4.10 pm scatters from an electron initially at rest. Find the maximum kinetic energy for the scattered electron
Three resistors having resistances of 1.20 ohm, 2.50 ohm , and 4.60 ohm are connected in parallel to a 25.0 V battery that has negligible internal resistance. Find the equivalent resistance of the combination.
The mass of Mercury is 0.0550 times that of earth, and its radius is 0.380 times that of earth, Calculate the average density of Mercury (in kg/m3) given the earth's density is 5.52×103 kg/m3
A 1.5 m cylinder of radius 1.1 cm is made of a complicated mixture materials. Its resistivity depends on the distance x from the left and obeys the formula p(x)=a+bx^2, What is the resistance of the rod
A sinusoidal wave traveling in the positive x-direction has a wavelength of 62.0 cm, a frequency of 58.0 Hz, and an amplitude of 74.0 cm. The part of the wave that is at the origin at t = 0 has a vertical displacement of 22.94 cm.
In a railroad yard, a 3.5×10^4 kg boxcar moving at 6.0 m/s is stopped by a spring-loaded bumper mounted at the end of the level track
On average, an electric water heater operates for 1.6 hour each day. Determine the resistance of a typical water heater
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