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Two oils are tested to establish their viscosity index. Oil "A" and Oil "B" have their viscosity measured at temperatures of 40C and 100C. Oil "A" has a viscosity of 80Cst at 40C and 8Cst at 100C. Oil "B" has a viscosity of 90Cst at 40C and 15Cst at 100C. Which oil has the higher viscosity index?
Consider two planets in space that gravitationally attract each other. If the mass of one planet is increased six-fold, then the force between them changes by what factor
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.30 106 m/s. Find the centripetal acceleration of the electron
a block of 2.7 kg slides was moving with a speed of 1.0 ms on a frictionless horizontal surface until it encounters a
The most intense beam of light that can propagate through dry air must have an electric field whose maximum amplitude is no greater than the breakdown value for air: Eair max = 3.0 x 106 V/m, Calculate the intensity of this wave
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.884 A) sin [(333 Hz)t]. What is the average power delivered to the light bulb
A block of ice of mass 3.50 is placed against a horizontal spring that has force constant = 210 and is compressed a distance 2.90×10?2. Calculate the work done on the block by the spring
You've been sent to a new planet. In order to determine the planet's free-fall acceleration, At what time is the ball at its maximum height
The sun is 30 degrees above the horizon. It makes a 48 meter long shadow of a tall tree. How high is the tree
two charges q1 and q2 are 8.0 cm apart. charge q1 5.0 nc and q2 -5.0 nc. what is the the electric field at point p
A mass-spring system oscillates with an amplitude of 4.40 cm. If the spring constant is 237 N/m and the mass is 411 g, Determine the maximum speed of the object
A 150-kg motorcycle goes around an unbanked turn of radius 10.5 m at a steady 100 km/h. What is the magnitude of the net force on the motorcycle
A heat engine absorbs 250 kcal of heat from a high temperature reservoir and exhaust 175 kcal to a low temp recover. Decide engine's thermal efficiency from the efficiency of an ideal gas heat engine,
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