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Unpolarized light goes through six Polaroid sheets. Each Polaroid sheet is at an angle of 30° from the one before it. What is the intensity of the light after it passes through all the sheets?
An earth satellite revolves in a circular orbit at a height of525 km above the earth's surface. What is the radial accerlation of the satellite
A dish of hot food has an emissivity of 0.40 and emits 20 W of thermal radiation. If you wrap it in aluminium foil, which has an emissivity of 0.008, how much power would it radiate.
A 0.159 kg toy is undergoing SHM on the end of a horizontal spring with force constant 310 N/m. Find the total energy of the object at any point in its motion
An air conditioner connected to a 120 V rms ac line is equivalent to a 14.9 ? resistance and a 1.39 ? inductive reactance in series. calculate the impedance of the air conditioner
100 g of a certain radioactive sample are sealed into a container. after 10 years, only 25 g remain. what is the half life of the sample
Children in a tree house lift a small dog in a basket 4.80 up to their house. If it takes 221 J of work to do this, what is the combined mass of the dog and basket
An electron experiences the greatest force as it travels 1.02*10^6 m/s in a magnetic field when it is moving horizontally. The force is upward and of magnitude 1.75*10^-12 N. What is the magnitude of the magnetic field?
What is the voltage as a function of time accross a capacitor C connected in a single series loop with a resistor R, By what phase angle does current lead voltage
question1a diffraction grating has 3816 linescm. light that contains all wavelengths between 464 and 636 nm shines on
A cart of mass 360 g is placed on a frictionless horizontal air track. A spring having a spring constant of 9.0 N/m is attached between the cart and the left end of the track.
Then, a thin conducting wire connects the spheres, redistributing the charge on each sphere. When the wire is removed the spheres still repel but with a force of F2 = 0.100 N. Using this information, find the initial charge on each sphere, q1 and ..
Traffic is moving along the highway at 52 km/h on a rainy day. Illustrate what is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road?
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