Q- A parallel plate capacitor is having capacitance 50 nF and given a charge of 2µC.
(a) If an electron escapes from the negative plate, how much kinetic energy it will gain while reaching positive plate?
(b) How much energy is stored in the electric field between the plates?
(c) If the plates…
Q- Consider an object on which the net force is a resistive force proportional to the square of its velocity as F = -kmv2, where k is a constant and m is mass of the object. At t = 0 the speed of the object is Vo. Find an expression for the speed of the object at subsequent time t.
Q- Light from a laser hits the surface of cesium, with minimum photon energy of 2.5 eV being required to remove photons. When the surface of cesium is illuminated with this light photo-electrons are emitted with a max kinetic energy of 0.75 eV. What would be the energy of the photons comprising the …
Q- A 65.0 kg boy and his 40.0 kg sister, both wearing roller blades, face each other at rest. The girl pushes the boy hard, sending him backward with a velocity 2.90 m/s toward the west. Ignore friction.
(a) Describe the subsequent motion of the girl.
(b) How much chemical energy is converted in…
Q- A small block of mass 80 g is oscillating on a spring. The equation of motion for its position x as a function of time is given by
x(t) = (5.0 cm) cos (10t + π/4)
(a) what is the amplitude of the oscillation?
(b) What is the period of oscillation?
(c) What is the…
Q- A billiard ball of mass m rolls without slipping across a table at speed v0. It collides with the lower end of a rod of mass M = 2m and length d, pivoted at its center and initially at rest in vertical position. After collision the ball rolls straight with half of its initial speed. What is the r…
Q- A siphon tube is filled with gasoline and closed at each end. One end is inserted into a gasoline tank 0.20 m below the surface of the gasoline. The outlet is placed outside the tank at a distance 0.50 m below the surface of the gasoline. The tube has an inner cross-sectional area of 4.2*10-4 m2.…
Q- A boat is trying to get from point A to point B, which is exactly to the east of A. The ocean current is due north at 4.8 km/h. The boat speed relative to the water is 18 km/h.
a) If the captain heads his boat due east, what will be his actual course relative to the shore?
b) To attain a stra…
Q- A hollow cylinder of radius a and length L, open at its ends, carries a uniform surface charge density σ. Use the formula for electric field due to a thin uniformly charged ring; find the expression for the electric field at a point P on the axis of the cylinder at a distance b from its nearest …
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