Q- In the oceans, whales communicate by sound transmission through the water. A whale emits a sound of 60 Hz to tell a wayward calf to catch up to the pod. The speed of sound in water is about 1500 m/s.
(a) How long does it take the sound to reach the calf if he is 1.46 km away?
(b) What is the wa…
Q- Electrons with a speed of 2.5 *106 m/s pass through a double-slit apparatus. Interference fringes are detected with a fringe spacing of 1.6 mm.
(a) What will the fringe spacing be if the electrons are replaced by neutrons with the same speed?
(b) What speed must neutrons have to produce interfe…
Q- (a) What is the impulse needed to stop a 20 kg bowling ball moving at 5 m/s?
(b) A 2000 kg car accidentally drops from a crane and crashes at 30 m/s to the ground below and comes to an abrupt halt. What is the momentum at impact?
(c) A railroad diesel engine weighs two times as much as a freig…
Q- Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them. When the blocks released, the block of mass 3M moves to the right with a speed of 2.00m/s
(a) What is the …
Q- Un-polarized light enters a series of three polarizers. The axis of polarization of second makes an angle of 60 degree with that of first and the angle between the axes of second and third is 45 degree. What percentage of the initial intensity of light is transmitted through the system of polariz…
Q- A light cable is used to pull a block of mass 10 kg on a rough horizontal surface (coefficient of friction 0.2). The cable is passed through a fixed pulley of radius 0.25 m and moment of inertia 1.2 kg-m2, which is free to rotate about its horizontal axis. The cable is horizontal between the pull…
Q- An electromagnetic wave has a frequency of 110 MHz and is traveling in a vacuum. The magnetic field is given by B (z, t) = (2.00 x 10-8 T) cos (k z - ω t) i.
(a) Find the wavelength and the direction of propagation of this wave.
(b) Find t…
Q- Two cylindrical rods, one of steel and the other of brass, are joined at C and restrained (fixed) by rigid supports at A and E with their natural lengths as shown in the figure. Now forces of 60 kN and 40 kN are applied at points B abd D resoectively. Knowing that E(steel)=200 GPa and E(brass)=10…
Q- A long straight wire carrying a current of I1 = 30 A is paced in the plane of a rectangular wire loop and parallel to its nearest side of length l = 30 cm, at a distance of a = 1 cm. The width of the loop is b = 8 cm. Find the magnitude of the net force on the loop if the current in the loop is I
Q- A wad of sticky clay with mass m and velocity vi is fired at a solid cylinder of mass M and radius R. The cylinder is initially at rest and is mounted on a fixed horizontal axle that runs through its center of mass. The line of motion of the projectile is perpendicular to the axle and at a distan…
Q- Throughout space there is a uniform electric field in the - y direction of strength E = 550 N/C. There is no gravity. At t = 0, a particle with mass m = 2 g charge q = -11 µC is at the origin moving with a velocity v0 = 45 m/sat an angle q = 25° above the x-axis.
(a) What is the magnitude of …
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