Physics Answers

An ant on a picnic table travels 40 cm east, 35 cm north, then 20 cm west. hat is the magnitude of the ant's displacement relative to its orginal position?

(6) Give the atomic view of dielectric

(1) Explain the term electric field and line of force

(2) Derived an expression for a dipole in an electric field.

(3) Compared electrostatic and gravitational field and show difference from each other.

(4) Calculate the electronic potential energy of an electron system of an atom.The radius of the orbit of the electron.2.16*10^-11m. The charge on the electron is 1.6*10^-19C. Where 1/4Eo=9.0*10^9NM^2-2

(5) Calculate the capacity of parallel plates condenser.what will be the capacity if the space between the plates is partially filled with slap of thickness and dielectric constant Er

plastic spherical balloon is held below the surface of a swimming pool by a cable tied to

the bottom of the pool. The sphere has a volume of 1.50 x 10-2m3 and the tension in the

cable is 90.0N. What is the buoyant force exerted by the water on the sphere? 147N

The Q value of the Na23 (n,α) F20 reaction is -5.4MeV. Determine the threshold energy of the neutrons for this reaction (22.9898u, 18.9964u, 4.0039u, 1.008665u are the masses of Na23, F20 α and n respectively).

in an experiment to measure the height of a ceiling, a pendulum bob was suspended from the ceiling so that the initial height h of the bob from the floor was 20cm. at this height, the bob was displaced and set into oscillation. the time for 20 oscillations was determined and recorded, this was repeated once and the average time t for 20 oscillations and hence, the period of oscillation t was calculated. the experiment was repeated for different heights of the bob from the floor and in each case the corresponding values of h,t1 and t2 was recorded and shown below. h(cm)= 20.00, 40.00, 60.00, 80.00, 100.00. t1= 46.30, 41.85, 37.95, 33.20, 28.85. and t2= 46.00, 41.95, 38.00, 33.35, 28.95. draw a table showing the corresponding values of h, t, t and t²

1. A bulb drawn 0.4 A current from a 3 V battery in 6.5 minutes. Calculate the

(a) number of charge that flows in the circuit.

(b) resistance of the bulb filament.

(c) energy dissipated in the bulb.

A green line of wavelength 435 nm is

observed in the emission spectrum of hydrogen. Calculate the energy of one

photon of this green light.

What is the kinetic energy of a

proton (proper mass is m0 = 1.67 x 10^-27 kg) travelling at 40 % of the speed

of light?

The rest mass of an electron is 9.1 x

10^-31 kg. What is the relativistic mass if its velocity is 55 % of the speed

of light?