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A helicopter is cruising at a speed of 25.0 m/s at an altitude of 185 m. What is the total mechanical energy of the helicopter?
An uncovered swimming pool loses 1 inch of water off of its 1000ft^2 surface each week due to evaporation
In the year 2050, very efficient heating systems involving heat pumps are commonly used. When people leave their heated office room
A 1 m^3 closed container contains air with vapor pressure 10hPa. a dish containing 8 g of liquid water is placed in the container.
How much more effective will a double layered heat shield (.1mm stainless steel outer shell (facing radiant heat source)
In a simulation, m1 is 1.0 kg and m2 is 1.1 kg. Mass m2 rests on the floor that exerts a normal force, FN, on m2.
Your local electric company supplies you with 1 kW of power for 1 hour for 8 cents. Assume that you could climb these stairs continuously for 1 hour.
Light from a laser hits the surface of cesium. With a minimum photon energy of 2.14eV being required to remove photons.
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.
If a1 and a2 are the accelerations of m1 and m2, respectively, what is the relation between these accelerations?
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.
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 loading a spring loaded dart gun and do an amount of work W such that the spring is only 1/3 compressed.