Q1- A ray of sunlight hits the ice on a frozen lake at 600 angle of incident. (a) At what angle does the refracted ray penetrate the water beneath the ice? (b) What is the speed of light for the refracted beam in the water? Refractive index of water = 1.333 and that of ice = 1.039.
Q2- A convergin…
Q- A disk of mass M1 = 350 g and radius R1 = 10 cm rotates about its symmetry axis at finitial = 157 rpm. A second disk of mass M2 = 261 g and radius R2 = 6 cm, initially not rotating, is dropped on top of the first. Frictional forces act to bring the two disks to a common rotational speed ffinal. (…
Q- A block of mass m1 = 1 kg rests on a table with which it has a coefficient of friction 0.54. A string attached to the block passes over a pulley to a block of mass m3 = 3 kg. The pulley is a uniform disk of mass m2 = 0.4 kg and radius 15 cm. As the mass m3 falls, the string does not slip on the p…
Q1- a) What is the resistance of a light bulb that uses 75 Watts at 115 Volts? b) What is the current in the bulb in this situation?
Q2- An electric heater is designed to consume 600 W when connected to a 120 V line. How much power is actually used if line voltage is only 110 V?
Q3- A 6V, 3W l…
Q1- Neutron stars are extremely dense objects with a mass comparable to the mass of the sun but a radius of only several thousand meters. Consider a neutron star of mass M = 1.99*1030 kg and a radius of R = 10.2 km.
(a) What is the gravitational acceleration near the surface of the star?
(b) If an…
Q- A long conducting pipe of radius R carries a uniformly distributed current I1 along its length. A long conducting wire carries a current I2 in same direction is placed at a distance of 3R from the axis of the pipe and parallel to it. Find
(a) Magnetic field at the center of the pipe
(b) Magneti…
Q- A block of mass 5 kg hangs on a spring. When a second block with an identical mass of 5 kg is tied to the first, the spring stretches an additional ho = 1 m.
a) What is the value of the spring constant k?
Now the string is burned and the second block falls off.
b) How far above its original …
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