A 12-g bullet moving horizontally strikes and remains in a 3.0-kg block initially at rest on the edge of a table. The block, which is initially 80 cm above the floor, strikes the floor a horizontal distance of 120 cm from its initial position. What was the initial speed of the bullet?
a. 0.68 km/s
b. 0.75 km/s
c. 0.81 km/s
d. 0.87 km/s
e. 0.41 km/s
B
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A soccer ball is released from rest at the top of a grassy incline. After 6.4 seconds the ball has rolled 91 m with constant acceleration, and 1.0 s later it reaches the bottom of the incline
(a) What was the ball's acceleration? (b) How long was the incline?
The best shape for an automobile to have is one that is streamlined both in the front and in the back. The reason for this is
A. to ensure the air flow remains laminar all the way around the vehicle. B. to use the viscosity of the air to help propel the automobile forward. C. to improve fuel efficiency when driving in reverse. D. to avoid uneven air flows that might push the vehicle sideways.
The ozone hole is found in this atmospheric layer ______
a. thermosphere b. troposphere c. stratosphere d. ionosphere e. mesosphere
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^-10 m. The electric potential created by the electron at the position of the proton is
a. -13.6 V. b. +13.6 V. c. -27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.