The speed of light is a relativistically invariant quantity
Indicate whether the statement is true or false
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A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
a. 10 m/s; 9.8 m/s2. b. 9.0 m/s; 9.8 m/s2. c. 9.0 m/s; 9.0 m/s2. d. 1.0 m/s; 9.0 m/s2. e. 1.0 m/s; 9.8 m/s2.
Some 10 solar mass main-sequence stars have much shorter lifetimes than other 10 solar mass main-sequence stars
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Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00 cm-wide slit. What is the total angular width (2?) of diffracted sound waves when the speed of sound in air is 340 m/sec
a. 167° b. 83.6° c. 19.5° d. 41.8° e. 0.11°
A parallel-plate capacitor with plate area A and plate separation d has a capacitance of 4 ?F with the gap between the plates unfilled. The gap is then filled with two dielectric materials, one with dielectric constant 2 and the other one with dielectric constant 6 . Each slab of dielectric has area A and thickness d/2, the layering of the dielectrics resulting in the gap being completely
filled. Which of the following combinations of capacitors will have the same capacitance as the newly filled parallel-plate one? a. two capacitors in parallel, one with capacitance of 8 ?F and the other with capacitance of 24 ?F b. two capacitors in series, one with capacitance of 8 ?F and the other with capacitance of 24 ?F c. two capacitors in parallel, one with capacitance of 16 ?F and the other with capacitance of 48 ?F d. two capacitors in series, one with capacitance of 16 ?F and the other with capacitance of 48 ?F e. two capacitors in parallel, one with capacitance of 8 ?F and the other with capacitance of 48 ?F