A weather map has many symbols and lines. Isobars are lines that
A) depict wind speed and direction.
B) connect points of equal temperature.
C) connect points of equal pressure.
D) none of the above
Answer: C
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The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid, water-rich world. b. the climate on Mars was different billions of years ago. c. volcanism is occurring on Mars. d. the polar caps are made of liquid water. e. All of the other choices are correct.
Wave Characteristics: An electromagnetic wave travels in free space in the +y direction, as shown in the figure. If the electric field at the origin is along the +z direction, what is the direction of the magnetic field?
A. +z B. -z C. +y D. +x E. -x
Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
A. it is passing car A. B. it has the same linear (tangential) acceleration as car A. C. it has the same centripetal acceleration as car A. D. it has the same total acceleration as car A. E. it has traveled farther than car A since starting.
A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg ? m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each of mass 60 kg, are standing right outside the edge of the merry-go-round and suddenly step onto the edge with negligible speed relative to the ground. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s B) 0.40 rad/s C) 0.60 rad/s D) 0.80 rad/s E) 0.67 rad/s