The cratered surfaces of Saturn's moons may look like our moons, but in reality they are made chiefly of ________
Fill in the blank(s) with correct word
ice
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A blimp is filled with 440 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.178 kg/m3.)
a. 396 kg b. 568 kg c. 78.3 kg d. 489 kg e. 646 kg
A hoop, solid sphere, and solid cylinder each have the same mass and same radius. When rolling down the same incline, which has the greatest torque from gravity on it?
a. the hoop b. the sphere c. the cylinder d. They all have the same torque.
An optic fiber is made of clear plastic with an index of refraction of 1.50. For what range of angles of incidence ? with the lateral surface of the fiber will light remain inside the plastic "guide" if it is surrounded by air?
A) 21.1° < ? < 90° B) 23.4° < ? < 90° C) 38.3° < ? < 90° D) 40.3° < ? < 90° E) 41.8° < ? < 90°
How can Kirchhoff's Laws be used to deduce something about the nature of the light source?
What will be an ideal response?