Identical particles are placed at the 50-cm and 80-cm marks on a meter stick of negligible mass. This rigid body is then mounted so as to rotate freely about a pivot at the 0-cm mark on the meter stick. If this body is released from rest in a horizontal position, what is the angular speed of the meter stick as it swings through its lowest position?
a. 4.2 rad/s
b. 5.4 rad/s
c. 4.6 rad/s
d. 5.0 rad/s
e. 1.7 rad/s
B
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Polarization: A vertically polarized beam of light of intensity 100 W/m2 passes through two ideal polarizers. The transmission axis of the first polarizer makes an angle of 20.0° with the vertical, and the transmission axis of the second one makes an angle of 40.0° with the vertical. What is the intensity of the light after it has passes through both polarizers?
A. 22.2 W/m2 B. 44.4 W/m2 C. 66.6 W/m2 D. 78.0 W/m2 E. 11.7 W/m2
A hydraulic press, like an inclined plane, is capable of increasing energy
A) sometimes true B) always false C) always true D) sometimes false
The term ______________ refers to the way in which a mineral breaks into splinters, irregularly shaped pieces, or shell-shaped surfaces
Fill in the blank(s) with correct word
A 12000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil with a density of 800 kg/m3 and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the force that must be applied to the smaller piston in order to lift the car after it has been raised 1.20 m? For purposes of this problem, neglect the weight of the pistons. A) 0.954 kN B) 1.88 kN C) 1.96 kN D) 3.67 kN E) 1.20 kN