Free Fall: An object is thrown upwards with a speed of 13 m/s. How long does it take to reach a height of 4.0 m above the projection point while descending? Neglect air resistance.
A. 0.42 s
B. 1.2 s
C. 2.3 s
D. 3.1 s
E. 4.2 s
Answer: C
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Calorimetry: A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the bath water?
A. 34°C B. 36°C C. 38°C D. 40°C
A wooden block contains some nails so that its average density is exactly equal to that of water. If it is placed in a tank of water and released from rest when it is completely submerged, it will
A) rise to the surface. B) sink to the bottom. C) remain where it is released.
A simple circuit consists only of of a 1.0-?F capacitor and a 15-mH coil in series. At what frequency will this circuit oscillate?
A) 15 kHz B) 1.3 kHz C) 0.77 kHz D) 67 Hz
An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire. The aluminum wire has a diameter of 2.2 mm
What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 Pa and for steel it is 2.0 × 1011 Pa.