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An object is placed 25.0cm from a thin converging lens. A screen is positioned so that a sharp image of the object is seen on the screen. When the object is moved 4.0cm closer to the lens, the screen must be moved 3.0cm farther away from the lens in order to retain a sharp image. Determine the focal length of the lens.(What is the focal length of the lens?)
Explain why easier to pull a lawn roller than to push it? Explaination : In Pulling, effective weight of lawn mover= mg-fsinx In pushing, effective weight = mg+
Who are the best system integrators? Being fairly the opposite of fiber optics manufacturers, system producers are generally small companies. In this case size has the opposite
a boy throws a ball of mass 20 kg vertically upwards.it raises to a maximum height of 100 m.at what height will the kinetic energy be reduced to 70%
Q. Why nichrome is used as heating element in electric heating devices? Nichrome, an alloy of nickel as well as chromium is used as the heating element for the following reaso
1- Two researchers test the same hypothesis. Researcher A rejects the null hypothesis and researcher B fails to reject the null hypothesis. Discuss three reasons that could cause
Consider the water heat distribution system shown below where: The fractions refer to the fraction of the stream ?owing, e.g. 20% of the stream leaving the 100,000 Btu/ hr heate
A more forceful argument which the weak principle: This implies that if the laws of the Universe were not favorable to the development of intelligent creatures to ask regarding the
faraday law of induction(differential and integral form)
What are coherent sources? Why are coherent sources required to produce interference of light? Give an example of interference of light in everyday life. In Young's double slit exp
Q. Compare the emf and the potential difference . Comparison of emf and potential difference 1. The difference of potentials among the two terminals of a cell in an open cir
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