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Question1

A dolphin located in sea water at a temperature of 26C emits a sound directed toward the bottom of the ocean 157 m below. How much time passes by it hears an echo? Assume the speed of sound in sea water is 1530 m/s at this temperature.

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Question2

A conducting circular loop placed in a uniform magnetic field B=0.020 T with its plane vertical to the field. Somehow the radius of loop starts shrinking at a constant rate of 1.0 mm/sec. Find out the induced emf in the loop at an instant when the radius is 2 cm.

Question3

A bus travels 290 km south along a straight path with an average velocity of 86 km/h to the south. The bus stops for 26 min, then it travels 230 km south with the average velocity of 66 km/h to the south. How long does the total trip last?

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Category:- Physics
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