A frictionless simple pendulum, with a small but dense 4.4-kg bob at the end and a length of 75 cm, is released from rest at an angle of 50° with the vertical
(a) To what height above its lowest point does the bob swing on the other side? (b) What is the speed of the bob at the bottom of the swing?
(a) 27 cm (b) 2.3 m/s
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The Tonga Trench in the Pacific Ocean is 36,000 feet deep. Assuming that sea water has an average density of 1.04 g/cm3, calculate the absolute (total) pressure at the bottom of the trench in atmospheres
(1.00 in = 2.54 cm, 1.00 atm = 1.01 × 105 Pa) A) 1.1 × 103 atm B) 1.1 × 108 atm C) 1.1 × 105 atm D) 1.1 × 106 atm E) 2.1 atm
In this photo, the left side of a ceramic dish is ice-cold while the right side is very hot. What property of a ceramic, at the atomic/molecular level, would make it a poor heat conductor compared with a copper dish?
a. Ceramics fall apart at high temperatures. b. Only colliding and vibrating atoms transfer their motion to each other and cause conduction. c. The electrons in the ceramic, which is an electrical insulator, are not as free to move over large distances to help transfer thermal energy. d. Only electrons that conduct electric current can transfer energy and cause heat conduction. e. Only metals conduct heat.
In the double-exhaust model, the radio lobes of a radio galaxy are inflated by
a. jets of excited gas flowing from the central galaxy. b. jets of high-energy sound waves flowing from the central galaxy. c. a disk of ionized material that orbits very near a supermassive black hole. d. dark clouds of very cold gas and dust. e. None of the other choices are correct.