Mass on a Spring: A 0.30-kg block of wood is suspended on a spring. In equilibrium the wood stretches the spring 2.0 cm downward. The wood is then pulled an additional distance of 1.0 cm down and released from rest.(a) How long does it take the wood to make 3 complete cycles of vibration?(b) How much total mechanical energy does this system contain if we choose the total potential energy (elastic and gravitational) to be zero at the equilibrium position of the hanging block?
What will be an ideal response?
(a) 0.84 s (b) 7.4 mJ
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Heating from _________ causes the top of Earth's stratosphere to be warmer than the bottom.
a. higher-energy particles in the solar wind b. convection c. the ozone layer absorbing UV light d. charged particles trapped by magnetic fields e. the greenhouse effect
During a period of high solar activity, most sunspots lie near the Sun's ________
Fill in the blank(s) with correct word
You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the
earth are directed a. upward. b. downward. c. from south to north. d. from north to south. e. from east to west.
Which of the following statements best describes the concept of structural conformation?
A) rearranging the shape of a molecule by rotating around bonds B) rearranging the shape of a molecule by changing the arrangement of bonds C) changing the structure by adding or subtracting bonds D) arranging the atom into the best conformation for the given structure E) changing the conformation to generate a new molecule with different chemical properties