An umbrella tends to jerk upward on a windy day principally because
A) air gets trapped under the umbrella, which warms, and rises.
B) buoyancy increases with increasing wind speed.
C) air pressure is reduced over the curved top surface.
D) all of the above
Answer: C
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A radioactive nuclide of atomic number Z emits an electron, then the daughter nuclide emits a gamma ray. What is the atomic number of the resulting nuclide after both processes?
A) Z+1 B) Z-1 C) Z-2 D) Z-3
Which of the following quantities, if any, remain constant as a projectile moves through its parabolic trajectory?
(i) speed (ii) acceleration (iii) the horizontal component of velocity (iv) the vertical component of velocity
1.(i) only 2.(ii) and (iii) 3.(ii) and (iv) 4.all of themHow many arcseconds are in one arcminute?
A) 10,000
B) 60
C) 360
D) 100
E) 3600
The continuous part of an x ray spectrum of an atom occurs because
a. of photon absorption b. of the photoelectric effect c. electrons in the atom make transitions to lower energy levels d. of the uncertainty principle e. of rapid deceleration of the bombarding electrons