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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
Ask queA cart of weight 25 N is released at the top of an inclined plane of length 1m, which makes an angle of 30° with the ground. It rolls down the plane and hits another cart of
The topic for the project is Newton's Law of Cooling, although you may choose a different title. The aim is to research how the temperature of a hot object is lost when it is kept
One scientist wants to put an 100kg experimental package in orbit around the Earth. The cost of deployment depends on the amount of more extra energy it takes to get it into the r
how can we conclude whether at some time interference will take place or not with the help of the concept of temporal coherence?
What is the importance of vector quantities in real life? Cite some applications.
Are there different types of optical ports? Optical ports can be divided into two types: pressure and potting. Potting optical ports are small more than a hollow tube into that
A device which changes light energy into electrical energy is known as photoelectric cell. It is also known as photocell or electric eye.
A virtual image can be formed by one or more of the following single mirrors? Identify them. a) Plane mirror b) Concave spherical mirror c) Convex spherical mirror
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Q. State Coulombs law in electrostatics? Coulomb's law declares that the force of attraction or repulsion between two point charges is directly proportional to the product of t
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