An object moves 10 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object?
a. +
b. ?
c. 0 (no sign)
d. any of the above
c
Physics & Space Science
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What fraction of the original uranium-235 should be left after 3.5 billion years?
A) 1/2 B) 1/4 C) 1/8 D) 1/32 E) 1/64
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A 10.0-kg picture is held in place by two wires, the first one hanging at 50.0° to the left of the vertical and the second one at 45.0° to the right of the vertical. What is the tension in the first wire?
A) 69.6 N B) 50.8 N C) 98.1 N D) 69.4 N E) 23.8 N
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Light goes slower through glass than through air
Indicate whether the statement is true or false
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When 1.0-µC point charge is 15 m from a second point charge, the force each one experiences a force of 1.0 µN. What is the magnitude of the second charge? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 25 C B) 25 nC C) 0.025 C D) 1.0 C E) 10 nC
Physics & Space Science