Problem 10 the projector in kimpel 102 is about 7m = 700cm from the screen at the front of the classroom. from the size of the projector enclosure, the object in the projector cannot be more than 5cm from the projector lens. what is the approximate focal length of the lens in the projector? select one of the following: 3 (a) 4.96cm (b) 5.04cm (c) 30.3cm (d) 350cm (e) 700cm

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.