What POWER lens placed next to a lens of 25. cm focal length would produce a combination with an effective INFINITE focal length?
What will be an ideal response?
-4.0 Diopters
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A sand mover at a quarry lifts 2,000 kg of sand per minute a vertical distance of 12 m. The sand is initially at rest and is discharged at the top of the sand mover with speed 5.0 m/s into a loading chute
What minimum power must be supplied to this machine? A) 6.7 kW B) 4.3 kW C) 3.9 kW D) 1.1 kW E) 520 W
An object is undergoing simple harmonic motion of amplitude 2.3 m. If the maximum velocity of the object is 10 m/s, what is the object's angular frequency?
A) 4.3 rad/s B) 4.8 rad/s C) 3.5 rad/s D) 4.0 rad/s
A cube of copper 0.10 meters on each side has an average grain size of 10 × 10-6 m. The average grain boundary energy of copper is 625 × 10-3 J/m2 . Assume that all of the grains are cubes 10 × 10-6 m across.
Two masses are being pulled up a frictionless 30.0 degrees incline by a force F parallel to the incline. The acceleration up the incline is 1.00 
The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The force F is
A. 875 N. B. 980 N. C. 1,140 N. D. 1,720 N. E. 2,070 N.