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The lifting force exerted on an airplane wing varies jointly as the area of the surface and the square of the planes velocity. The lift for a wing of area 120 sq.ft. is 2025 lb when the plane is going 90 miles per hour. Determine the lift if the speed is decreased to 80 mph.
Monochromatic light of wavelength 683 nm passes through a fast shutter that opens for 10^(-10) s. The light the emerges will no longer be monochromatic. What will be the spread of the wavelengths?
Suppose a hockey puck slides down a frictionless ramp with an acceleration of 5.60 m/s2. What angle does the ramp make with respect to the horizontal
Compute the angular momentum of the earth arising from the following motions. Earth's orbital motion around the sun
an electron is accelerated by a constant electric field of magnitude 270 nc.a find the acceleration of the electron.
During 0.12 s, a wheel rotates through an angle of 2.34 rad as a point on the periphery of the wheel moves with a constant speed of 2.29 m/s
What is the resultant vector, R, obtained by adding vectors C and D? Express the magnitude to three significant figures. Express the angle to one decimal place.
The density of ice is 917 kg/m3, and the density of sea water is 1025 kg/m3. What is the weight of the heaviest bear that the ice can support without sinking completely beneath the water
Power to a cooling fan is turned off when it is turning at 720rpm. The fan makes 1350 revolutions before it comes to rest. Calculate the fan's average angular acceleration
Two sound sources produce sound waves. The first source has an intensity level of 38.0 W/m^2 and the second source has an intensity level that is 2.5dB greater than the intensity level of the first source. What is the intensity level of the second so..
a small current element at the origin has a length of 3.8 mm and carries a current of 3.7 a in the z direction. find
An elevator is initially moving upward at a speed of 11.64 m/s. The elevator experiences a constant downward acceleration of magnitude 4.12 m/s2 for 3.21s. Find the magnitude and direction of the elevator's finalvelocity.
Suppose you have a concave spherical mirror with a focallength of 10 cm. What is the radius of curvature of the mirror
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