An object is thrown upwards with a speed of 16 m/s. How long does it take it to reach a height of 7.0 m on the way up? Neglect air resistance
A) 0.52 s
B) 1.2 s
C) 2.4 s
D) 3.1 s
E) 4.2 s
A
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Cold fusion has
a. solved the world's energy crisis. b. been used to create superheavy elements. c. been achieved using muons. d. rendered nuclear reactors obsolete.
What is the electron configuration for Li, which has 3 electrons?
A) 1s3 B) 1s1 2s2 C) 1s2 1p1 D) 1s2 2s1 E) 1s1 2s1 3s1
A river flows toward the East at 1.7 m/s. Steve can swim 2.0 m/s in still water. If he swims, relative to the water at a direction of 33 degrees west of north, how long will it take him to cross the 75 m wide river?
A. 45 s B. 39 s C. 123 s D. 27 s
A ray of light is incident on a pane of common window glass at an angle of 35° to the normal. The angle of the reflected ray with respect to the normal is
1) 35° 2) 55° 3) 90° 4) 20° and the refracted ray within the glass may be at an angle of 5) 35°. 6) 55°. 7) 22°. 8) 75°.