In 2.0 s, a particle moving with constant acceleration along the x axis goes from x = 10 m to x = 50 m. The velocity at the end of this time interval is 10 m/s. What is the acceleration of the particle?
a. +15 m/s2
b. +20 m/s2
c. -20 m/s2
d. -10 m/s2
e. -15 m/s2
D
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In order for a circuit to respond quickly, its time constant should be short. In a circuit involving resistance and capacitance, which of the following choices would result in the shortest time constant?
a. R = 75 W, C = 75 mF c. R = 300 W, C = 75 mF b. R = 200 W, C = 200 mF d. R = 100 W, C = 30 mF
Which of the sailboats shown sails the fastest in its forward direction?
1) 1 2) 2 3) 3 4) 4 It is interesting to note that 5) this is the only boat that sails forward. 6) only two of the boats sail forward. 7) three out of the four boats sail forward. 8) all sail forward, but at different speeds.
Why do flat disks form around young stars?
A) They don't; the stars form from the disks. B) Centrifugal force pushes gas outward from the spinning gas cloud. C) Intense winds from nearby massive stars flatten the gas cloud. D) Collisions between rotating gas particles flatten the gas cloud along the axis of rotation.
Which type of atom is the standard on which the atomic mass scale is based?
a. 12C b. 16O c. 1H d. 56Fe