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A 100 W lightbulb is plugged into a standard 120 V outlet. How much does it cost per month (30 days) to leave the light turned on continuosly? Assume electrical energy costs 7.5/kWh. (Enter dollars with no unit) What is the resistance of the bulb? What is the current in the bulb?
You drop a stone down a well that's 9.5m deep. How long until you hear the splash? Assume the speed of sound in air is 343m/s
Gamma rays of photon energy 0.458 MeV are directed onto an aluminum target and are scattered in various directions by loosely bound electrons there. find the photon energy of the rays scattered in this direction
A 14 g bullet travelling at 247 m/s is fired into a 0.459 kg wooden block anchored to a 100 N/m spring. How far is a spring compressed to the nearest thousandth of meter.
A 10.0-m long string is moved up and down with simple harmonic motion with a frequency of 33 Hz. Determine the wavelength of the waves on the string
Two ropes are attached to a heavy box to pull it along the floor. One rope applies a force of 438 newtons (N) in a direction due west; the other applies a force of 402N in a direction due south.
In compressing the spring in a toy dart gun, 0.4 J of work is done. What is the dart's kinetic energy as it leaves the gun
Calculate the thermal de Broglie wavelengths for helium-4 (boson) and helium-3 (fermion) gases at T = 5K
A wooden block of mass M = 0.170 kg is placed on a wooden inclined board 0.930 m long and raised to a height h1 = 0.050 m at the lower end, calculate the work done on the block by the normal force
Consider a system consisting of two long, concentric solenoids. The larger solenoid has current running in counter clockwise fashion. Find the magnetic field strength inbetween the solenoids. positive number if it is up
A certain solid-propellant model rocket engine releases a total of 6000 J as it burns. what fraction of the chemical energy released by the engine is wasted in the form of thermal energy in the air
a mass of 0.30 kg is attached to a spring and is set into vibration with a period of 0.24s. what is the spring
2kg block located on an incline plane with an angle of 60 degrees. the Force is a horizontal force. What is the normal force exerted on the block
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