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At a distance of 4,000 ft from the launch site, a spectator is observing a rocket being launched. If the rocket lifts off vertically and is rising at a speed of 600 ft/sec when it is at an altitude of 3,000 ft, how fast is the distance between the rocket and the spectator changing at that instant?Solution) Distance=s=√(40002+h2), rate of change of distance=ds/dt=(ds/dh)(dh/dt)=(d(√(40002+h2)/dh)(dh/dt),dh/dt=600 ft/sec
The potential of earth is taken as zero. Illustrate What is the difference between magnetic lines of induction and electric lines of force?
Motion of an object in a plane is called two dimensional (2-D) motions. For 2-D motion acceleration or velocity can be explained by two elements in any two mutually perpendicular d
The total energy of a simple harmonic oscillator is 0.8 erg. What is its kinetic energy when it is midway between an extreme position and mean position?
Can you explain lens maker's formula. Derive the mathematical expression for the effective focal length of two thin lenses in contact.
Can you explain Doppler effect? Find a mathematical expression for the apparent frequency heard when the source is in motion and the listener is at rest and also give limitation of
2 cars, 1 and 2 starting from rest are moving with speeds v1 and v2 m/s(v1>v2). car 2 is ahead of car1 by ''s'' metres when the driver of car 1 sees car 2. what minimum retardation
Does sunlight reflected off a mirror enhance the temperature of the sun-rays? A standard planar mirror will not enhance the energy contained in the rays that reflect off it. In
derivation by calculas method of Snth = (Sn – Sn -1) = u + a/2 (2n – 1)
A simple rotation machine Secure a breast-drill or hand- drill like as the one shown in the diagram. Clamp a small screw eye or cup hook in the chuck of the drill. Join a 30 cm
Q. Compute the mutual inductance between two coils when a current of 4 a changing to 8 a in 0.5 s in one coil induces an emf of 50 mV in the other coil. Induce emf e = -
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