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A force of 2.5kN is needed to lift a load. How much work is done if the load is lifted by 500cm?
An electromagnet exerts a force of 12N and moves a soft iron armature by a distance of 1.5cm in 40ms. Find the power consumed.
A mass of 500kg is raised to a height of 6m in 30s. Find
(a) the work done and
(b) the power developed
assignment about electro magnetic waves
In the following experiment, a constant-pressure calorimeter containing 100 ml of H 2 O is used. The initial temperature of the calorimeter is 24.6 o C. If 18.6 g of CaCl 2 is a
a) Can a gravitational field be added vertorially to an electric field to get a total field? Describe it. b) Can two equipotential surfaces cut down each other? describe it.
Constancy principle (A. Einstein): One of the postulates of A. Einstein's special theory of relativity, that puts forth that the speed of light in vacuum is calculated as the
Q. What is a frame of reference? A system of co-ordinate axes which describe the position of a particle in two or three dimensional space is called a frame of reference.
For a parallel-plate capacitor with plate area "A" and plate separation "d", the capacitance is proportional to which of the following? a) A divided by d squared b) A tim
Voltmeters: Voltmeters are used to measure emf's and more commonly potential differences. The two probes of the meter are therefore connected to the two points between which th
The density, ?, of an object is given by the ratio of the object's mass, m, and volume, V, according to the equation ? = m/V. What is the density of a cube that is 1.2 cm on each s
How can Newton rings experiment be used to determine refractive index of liquid? The experimental arrangement for Newton's rings set up is made with the plane convex lens pla
A general utility equal-arm balance Make a base about 22 cm square from wood about 2 cm thick. Next make two uprights from wood15 cm long by 6 cm wide by 2 cm thick and join th
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