Physics Answers

  Calculate the uncertainty in wavelength of a light emitted when an atom undergoes transition from an excited state that lasts for 10^-3 second.

what volume (in L) of 4.35 M CHI solutions is needed to react with 18.5 g of Ca(OH)2

Two round rods , one of steel , the other of brass, are joined end to end. Each rod is 0.5 m long and 2 cm in diameter. The combination is subjected to a tensile force of 5000 N. Find the strain in each rod.

    Young’s Modulus of Steel use 20 x 10^10 Pa,of brass use 10 x 10^10 Pa.

A sound sour moving at a constant speed of 249 m/s towards a detector, emits sound at a constant frequency of 5,100 Hz. Take the speed of sound in the air as 340 m/s. Calculate the wavelength of the sound emitted by the source

1. A capacitor consists of two square metal plates, each measuring 5.0 x 10-2 m on a side. In between the plates is a sheet of mica measuring 1.0 x 10-4 m thick. (a) What is the capacitance of this capacitor? (b) If the charge in one plate is 2.0 x 10-8 C, what is the potential difference between the plates?

A wheel is rorating in angular speed of 800 r.m on a shaft, whose moment of inertia is negligible. A second wheel initially at rest with twice moment of inertia of the first shaft is coupled to the same shaft.

(a) What is the angular velocity of the combined shaft and two wheels

(b) What is the change in rotational kinetic energy experienced by the system

A solid conducting sphere of radius 20.00cm has a charge of 2.00ųC. If the potential is zero at infinity, find the value of the potential at the following distances from the center of the sphere:

a. 5.00cm b. 10.00cm c. 15.00cm

Assume that you want to hold two spherical objects together with an electrostatic force having magnitude of 2.0 × 10^6 N, and they are separated by 1.0 m. If each sphere holds equal charge, how much should each have?

Determine the displacement vector that must be added to the displacement(25i - 16j) metre to give a displacement of 7.0 metres pointing in the x+ direction

1500kg of steam is to be produced per hour with an enthalpy of 3077kj/kg. The feed water supplied to the boiler has an enthalpy of 167.5 kj/kg. The velocities of the water at inlet and the steam at exist are 2m/s and 45m/s respectively. Find the rate of which heat must be supplied to the boiler.