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. August 2019

Current Electricity

Q- For the network shown in Figure

(a) Find the current I1

(b) Calculate the power dissipated by the 4 Ω resistor

(c) Find the current I2

Solution:

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 Posted in Current Electricity

Vectors: Parallel Forces

Q- The horizontal bar is acted upon by four vertical forces as shown in the figure. What is the horizontal distance from point O to the line of action of the resultant of the given forces?

Solution:

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 Posted in Mechanics

Electromagnetic Waves

Q1- How much time is required for a radio signal to travel from Earth to a space station on Mars if the planet Mars is 7.83 x 107 km from Earth?  

Q2- The speed of light through a transparent substance is 2.00 x 108 m/s. What is the index of refraction of the substance?

Q3- A monochromatic light …

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 Posted in EMI

Thermal properties

Q- At what speed an ice bullet (0oC) is to be fired on a target so that the whole ice in it is vaporized (100oC)? Consider the whole energy of bullet remains in it after hitting the target. (specific heat of water = 4.18 J/g/0C; Latent heat of ice = 334 J/g and latent heat of steam = 2272 J/g)

Solu…

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 Posted in Heat and Thermodynamics

Momentum

Q- A 5 kg fish swimming at 2 m/sec swallows an absent minded 1 kg fish swimming toward it at a velocity that brings both fish to a halt immediately after lunch. What is the velocity of the smaller fish before lunch?

Solution:

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 Posted in Mechanics

L-R Circuit

Q- Three resistors (R1 = 120 Ohms, R2 = 330 Ohms, and R3 = 240 Ohms) and an ideal inductor (L = 1.6 mH) are connected to a battery (V = 9 V) through a switch as shown. The switch has been open for a long time before it is closed at t = 0. At what time t0, does the current through the inductor (I3) …

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 Posted in AC
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