The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is
a. 0 d. 8 m/s2
b. 0.2 m/s2 e. 16 m/s2
c. 4 m/s2
D
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Which of the following places is the result of volcanoes erupting over a hot spot in the mantle?
A) Hawaii B) the Himalayas C) the Appalachians D) California
Two 5.0-µC point charges are 12 cm apart. What is the electric potential (relative to infinity) of this combination at the point where the electric field due to these charges is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 25 MV B) 12.5 MV C) 1.5 MV D) 0.0 MV E) 0.75 MV
Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination?
A) The equivalent resistance is less than that of the smallest resistor. B) The equivalent resistance is equal to the average of the four resistances. C) The equivalent resistance is midway between the largest and smallest resistance. D) The equivalent resistance is more than the largest resistance. E) None of the other choices is correct.
Very rapid time variations help establish the tiny size of many X-ray sources, showing they must be collapsed objects of some kind
Indicate whether the statement is true or false