A ball is dropped from the top of a science building. After falling for three seconds, the speed of the ball would be _______________ m/sec
Fill in the blank(s) with correct word
29.4
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A resistor of unknown resistance and a 15-W resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
a. 75 W b. 12 W c. 7.5 W d. 30 W e. 5.0 W
A series LRC ac circuit has a resistance of 4.0 k?, a capacitance of 33.0 ?F, and an inductance of 23.0 H. If the frequency of the alternating current is 2.0/? kHz,
what is the phase angle between the voltage and the current? A) 23 rad B) -1.6 rad C) 1.5 rad D) 3.1 rad
According to special relativity
1) space and time are aspects of each other. 2) mass and energy are aspects of each other, 3) both of the above, 4) neither of the above, and the underlying postulate of special relativity is 5) F = ma. 6) E = mc2. 7) that the speed of light has a constant value for all observers.
A "larger" Moon on the horizon is an optical illusion
a. True b. False Indicate whether the statement is true or false