When one observes a scratch on the bottom of a block of clear plastic, the scratch appears to be 2.5 cm below the top surface as viewed from above. The actual thickness of the plastic block is 3.0 cm. The index of refraction of the block is ________.
Fill in the blank(s) with the appropriate word(s).
1.2
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The output of a generator is 440 V at 20 A. It is to be transmitted on a line with resistance of 0.60 ?
To what voltage must the generator output be stepped up with a transformer if the power loss in transmission is not to exceed 0.010% of the original power? A) 4.4 kV B) 7.3 kV C) 22 kV D) 30 kW E) 45 kV
Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal dc voltage source. If the current through this circuit is 0.50 A, what is the voltage of the voltage source?
A) 20 V B) 40 V C) 60 V D) 80 V E) 100 V
An Olympic skier moving at 19.5 m/s down a 17.0° slope encounters a region of wet snow, of coefficient of friction ?k = 0.740 . How far down the slope does she go before stopping?
a. 56.7 m b. 46.7 m c. 56.1 m d. 36.7 m e. 37.4 m
Let's say that the magnitude of a particle's displacement is 2 m. Which of the following values could represent the distance traveled?
(i) 0 m (ii) 1 m (iii) 2 m (iv) 3 m
1.(iii) and (iv) 2.(ii), (iii), and (iv) 3.(i) and (ii) 4.all of them