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The inverse square law has very practical applications.
A 400-lb piano on frictionless casters is to be pushed up a 20 ft ramp to a loading platform 3 ft above the ground. How much force is needed?
A particular task exposes the operator to alpha radiation at an average dose of 250 uGy (micro-Gy) each time the task is performed.
The He-Ne laser operates on several s --->p transitions in neon, including the 5s --->3P transition at 632.8 nm. Under the operating conditions of the laser
To immobilize a fractured femur, doctors often utilize the Russell traction system illustrated in the figure below.
Where would a positive test charge have the least potential energy?
If a1 and a2 are the accelerations of m1 and m2, respectively, what is the relation between these accelerations?
The average human body has a temperature of 30 degrees celcius, a skin surface are of 1.20mt^2 and an emissivity of 1.0
Which polarization state of light is transmitted and absorbed (and why) in regular plastic polarizers which are actually long strings of molecules
A child slides down a slide with a 30 degree incline, and at the bottom her speed is precisely half what it would have been if the slide had been frictionless.
This is because methane absorbs red light but why greenish blue why not bluish green why not some other colour of the spectrum such as violet or orange
A paratrooper pilot fell 360 m after jumping without his parachute opening. He landed in a snowbank, creating a crater 1.5 m deep.
Suppose that a photon has energy of 5 x 10 -19 J. (five times ten to the negative 19th Joule) What's the wavelength of this photon?
A light bulb has a filament of metal that has an emissivity of 0.3 and a surface area of 5.0 x 10^-5 m^2. It is heated to 2500 degrees Celsius in an environment
Pocket ionization chambers are built in the form of an electrical capacitor. You know that capacitance is equal to a change in charge over a change in voltage
A 162 watt motor is used to lift a 147kg container to a height of 8m. how much time does it take to lift the container with the motor.
What is the rate of energy absorption in the shield
What thickness of cadmium is required to absorb 50% of an incident beam of thermal neutrons? Given: σ_capture = 2550 barns, ρ=8.65 g cm^-3, MW=112.4.
Torque is measured in Newton meters. Work can also be measured in Newton meters. What are the quantities measured in meters in the two cases?
You are a radiation scientist working for the space agency. A Mission Coordinator asks you to design shielding to prevent monoenergetic 10 MeV electrons
You are loading a spring loaded dart gun and do an amount of work W such that the spring is only 1/3 compressed.
How much money are you going to save if you convince the vendor that your potatoes don't weigh the 10[lb] he says they weigh?
A pool player imparts an impulse of 3.2 N.s to a stationary 0.25 kg cue ball with a cue stick. What is the speed of the ball just after the impact?
A car is traveling at a constant 60 miles per hour. What is its kinetic energy in Joules if its mass is 800 kg? (Remember to convert mph to m/s).
Tin can has a total volume of 1380 cm3 and a mass of 146 g. How many grams of lead shot of density 11.4 g/cm3 could it carry without sinking in water?