Doppler radar can
a. catch speeders
b. measure the speed of a pitcher's fastball
c. detect tornadoes
d. do all of the above
D
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What is the ratio of the time for the capacitor in an RC series circuit to reach 90% of capacity from an empty state, to that for the circuit to discharge from a ‘full’ state to 90% capacity?
A. 9 times as long B. 1/9 as long C. The same time is required D. 1/22 times as long E. Answer depends on the particular values of R and C. F. 22 times as long
The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m? = 140 MeV/c2). Estimate the longest time a ? can exist in accordance with the uncertainty principle ?E??t = h/2?. (h/2? = 1.05 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 C)
a. 3.3 × 10^?18 s b. 2.4 × 10^?21 s c. 4.7 × 10^?24 s d. 6.9 × 10^?27 s
Two identical grasshoppers jump into the air with the same initial speed and experience no air resistance. Grasshopper A goes straight up, but grasshopper B goes up at a 66° angle above the horizontal
Which of the following statements about these grasshoppers are correct? (There could be more than one correct choice.) A) At their highest point, both of them have the same amount of gravitational potential energy. B) At their highest point, both of them have the same amount of kinetic energy. C) At their highest point, both of them have the same amount of mechanical energy. D) At their highest point, grasshopper B is moving faster than grasshopper A. E) At their highest point, grasshopper A has more gravitational potential energy than grasshopper B.
When the equation Ca + H3PO4? Ca3(PO4)2 + H2 is balanced, the sum of all the coefficients (both written and "understood") is ______________
Fill in the blank(s) with correct word