A 0.30 kg mass is suspended on a string. In equilibrium the mass stretches the spring 2.0 cm downward. The mass is then pulled an additional distance of 1.0 cm down and released from rest.
(a) Write down its equation of motion.
(b) Calculate the velocity of the mass at T/3 s.
Question 2The net direction in which electrons flow through a circuit is:
A) the direction of the conventional current.
B) opposite of the direction of the conventional current.
Question 3Consider an aluminum rod encircling the Earth (radius 6378. km). If the linear thermal expansion coefficient of the aluminum is 24. 10-6 (C)-1,
and if the temperature of the rod increases by 1.0 C, how high off the ground would the expanded ring be (assuming uniform space all around)?
Question 4Climate models which ignore human activity
A) completely fail to match real climate data
B) match real climate data quite well
C) match real climate data perfectly
D) match real climate data, but only poorly
Question 5The rare-Earth hypothesis would predict that the factor flife, in the Drake equation should be close to
A) 0
B) 0.25
C) 1
D) 0.5
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