A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from a height of 2.00 m above the ground with a speed of 20.0 m/s and experiences no appreciable air resistance
The time the ball remains in the air before striking the ground is closest to A) 16.2 s.
B) 3.07 s.
C) 3.32 s.
D) 3.53 s.
E) 3.64 s.
E
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The six diagrams represent the sky at six different latitudes. Which diagram represents the paths of stars at the North Pole?
What will be an ideal response?
Earth is closer to the Sun in winter than in summer. The orbital speed of Earth about the Sun is therefore faster during the
1) summer. 2) winter. 3) is the same for all seasons. Correspondingly, the gravitational force between the Sun and Earth is strongest during 4) summer. 5) winter. 6) is the same for all seasons.
Two acceptable units for work _________________.
A) Joule b) Newton C) Watt D) Newton • Meter
The maximum value of the magnetic field component of an electromagnetic wave is 2.81 ?T. What is the rms value of the magnetic field?
A) 2.81 ?T B) 2.46 ?T C) 3.12 ?T D) 3.97 ?T E) 1.99 ?T