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A park ranger's flashlight beam strikes a lake surface. The reflected ray makes a 51 angle with the normal.
What angle does the refracted ray make with the normal in the water?
The molar mass oxygen gas is 32.0 x 10^-3 kg/mol. If the gas is at 21 degrees C, find the root-mean-square speed for an oxygen molecule
A particle's acceleration is described by the function ax =(10-t)m/s^2, where t is in s. At what time is the velocity again zero
A 52 {rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.50 turns each second. The distance from one hand to the other is 1.5 {rm m}. Biometric measurements indicate that each hand typi..
1. explain what is the difference between 10 dbnbsp and 20db?2. an automatic focus camera is able to focus on objects
The work function for potassium is 2.24 eV. If potassium metal is illuminated with light of wavelength 300 nm
A 775-g object undergoes an acceleration given by = (2.00 ? + 5.00 ?) m/s , find the resultant force acting on the object
A 17 kg girl slides down a playground slide that is 3.1 m high. When she reaches the bottom of the slide, her speed is 1.3 m/s. what is the coefficient of friction between the girl and the slide
What is the diameter of a copper sphere that has the same mass as a 2.00 cm x 2.00cm x 2.00 cm cube of aluminum?
If a power plant burns coal at 1000°C and the air temperature where the exhaust fumes cool is at 20°C, what is the maximum efficiency of the power plant?
light of wavelength 6.7x10^-7m travels first through air, and then enters a medium of higher index of refraction. what is the new speed of the light wave
Unpolarized light passes through five successive Polaroid sheets, What is the intensity of the transmitted beam
q1. a superconducting solenoid is to be designed to have an interior field of b 29t with a maximum current of i1000a.
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