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An electric motor rotating a workshop grinding wheel at a rate of 9.70 101 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 1.60 rad/s2.
(a) How long does it take for the grinding wheel to stop?
A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.6 m beyond the end of the board. what is the angle with which she enters the water
The distance between the first and fifth minima of a single-slit diffraction pattern is 0.40 mm with the screen 50 cm away from the slit, Calculate the angle of the first diffraction minimum
The speed of light in a certain substance is 89% of its valuein water. What is the index of refraction of this substance
An electric heater is used to heat a room of volume 66 m3. Air is brought into the room at 5°C and is completely replaced twice per hour. what minimum wattage must the heater have
A 1037 kg satellite orbits the Earth at a constant altitude of 108 km. How much energy must be added to the system to move the satellite
a cube made of wood has sides 15.20 cm in length with an uncertainty of 0.05 cm. What is the final volume of the cube and its uncertainty
An excited state of a certain nucleus has a lifetime of 5 X10-18s. Find the mimimum possible uncertainty of it's energy
Every 2 seconds, identical wave pulses are being sent along the string. At t = 3 seconds, you took a snapshot of the string and found the wavelength to be 10m. What's the velocity of the pulse?
A sphere of radius R has a charge Q. The electric field strength at a distance r > R is Ei. What is the ratio Ef/Ei of the final to first electric field strength if Q is halved.
An object with a net charge of 44 µC is placed in a uniform electric ?eld of 554 N/C, directed vertically. The acceleration of gravity is 9.81 m/s^2. What is the mass of this object if it ?oats in this electric ?eld?
A laser beam is incident at an angle of 36.0° to the vertical onto a solution of corn syrup in water. What is its frequencyin the solution
One gram of water changes from liquid to solid at a constantpressure of 1.00 atm and a constant temperature of 0°C. Find the change in the internal energy of the water
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