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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
Understand the manufacturing technique of optical fibres by using double crucible method. In double crucible method the inner platinum crucible has core material into molten fo
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Researchers found that a ________ is more important and is the key to losing weight rather than a popular one. A. Fad diet B. Counting calories diet C. Low-carb diet D. Stic
Used normally, a 150-watt, 120 volt light bulb requires how many amps of current? Ans: Used generally, a 150-watt, 120 volt light bulb needs 1.25 amps.
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In Thomson's effect we pact with only metallic rod and not with thermocouple as in Peltiers effect and Seebeck's effect. (That's why sometimes it is called as homogeneous thermo el
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Ask questionwhat r the axis&planes in human body.? In nature or in daily life is it applied or happening? #Minimum 100 words accepted#
A sphere of radius R touches two adjacent sides of a room.It also touches an inclined plane at a height of R/5 from the floor.the inclined plane moves towards the sphere at the spe
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