In order to go from rest to 50 m/s in 10 s, a jet must be able to accelerate at
A. 20 m/s2.
B. 2 m/s2.
C. 5 m/s2.
D. 50 m/s2.
Answer: C
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Potential of Point-Charges: The three point charges shown in the figure form an equilateral triangle with sides 4.9 cm long. What is the electric potential (relative to infinity) at the point indicated with the dot, which is equidistant from all three charges? Assume that the numbers in the figure are all accurate to two significant figures. (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0.00 V B. 1300 V C. 640 V D. 1900 V
How does the discovery of a comet typically differ from that of an asteroid?
What will be an ideal response?
Constant Acceleration Kinematics: Car A is traveling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind car B when the driver of car A accelerates his car with a uniform forward acceleration of 2.40 m/s2. How long after car A begins to accelerate does it take car A to overtake car B?
A. 5.50 s B. 12.6 s C. 19.0 s D. 316 s E. Car A never overtakes car B.
Daisy throws a rock horizontally with a speed of 12.0 m/s from a bridge. It falls 2.28 s before reaching the water below
(a) When the rock hits the water it is traveling with what horizontal component of velocity? (b) What was the total speed just before hitting the water?