An Atwood machine has a mass of 3.50 kg connected by a light string to a mass of 6.00 kg over a pulley with a moment of inertia of 0.0352 kg m2 and a radius of 12.5 cm
If the system is released from rest, what is the speed of the masses after they have moved through 1.25 m? A) 2.00 m/s
B) 2.28 m/s
C) 4.00 m/s
D) 4.95 m/s
E) 6.00 m/s
B
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If a stone is dropped so that the initial gravitational potential energy of the system stone-Earth is 100 J but it reaches the ground with a kinetic energy of only 75 J, this is a violation of the principle of conservation of energy
A) True B) False
Which of the following was the first strong evidence for an asteroid impact being the cause of the extinction of the dinosaurs 65 million years ago (as well as 75% of all species alive at the time)?
A) a worldwide layer rich in the element iridium that dates to that time B) the discovery of asteroid fragments in dinosaur bones dating to that time C) the fact that dinosaurs appear to have gone abruptly extinct at about that time D) careful studies of lunar craters suggesting an unusually large number of impact at that time
Heat is transferred from a substance if it is exposed to something that has a lower temperature
Indicate whether the statement is true or false
The atmosphere of Venus is about 95% ________
Fill in the blank(s) with correct word