Total Internal Reflection: A ray of light traveling in air makes a 63.0° angle with respect to the normal of the surface of a liquid. It travels in the liquid at a 39.2° angle with respect to the normal. Find the critical angle for total internal reflection for this interface.
Fill in the blank(s) with the appropriate word(s).
45.2°
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A battery is attached to several different capacitors connected in series. Which of the following statements is true?
1.All capacitors have the same charge, and the equivalent capacitance is greater than the capacitance of any of the capacitors in the group. 2.The capacitor with the largest capacitance carries the smallest charge. 3.The potential difference across each capacitor is the same, and the equivalent capacitance is greater than any of the capacitors in the group. 4.The capacitor with the smallest capacitance carries the largest charge. 5.The potential differences across the capacitors are the same only if the capacitances are the same.
Fluid Flow: In a section of horizontal pipe with a diameter of 3.0 cm, the pressure is 100 kPa and water is flowing with a speed of 1.5 m/s. The pipe narrows to 2.0 cm. What is the pressure in the narrower region? Treat the water as an ideal incompressible fluid.
A. 95 kPa B. 48 kPa C. 44 kPa D. 230 kPa E. 67 kPa
What do we mean by the interstellar medium?
A) the gas and dust that lies in between the stars in the Milky Way galaxy B) the dust that fills the halo of the Milky Way galaxy C) the middle section of the Milky Way galaxy D) the name of an oracle who can channel messages from beings that live near the star called Vega
A simple "do it yourself" experiment, performed in class, showing that objects accelerate as they fall is
A) dropping an object from several meters high, and measuring its position at the end of each second. B) dropping an object to the floor from various heights, and observing the sound of the object hitting the floor. C) using a flash camera to photograph the position of a ball at several equally-spaced times as the ball falls. D) throwing an object horizontally from some distance above the ground, and measuring the time for it to hit the ground as compared with an object that is simply dropped from the same distance above the ground. E) dropping an object to the floor from various heights, and measuring the time of fall.