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The Earth may be considered to be a uniform sphere of radius 6.38 × 106 m. Its mass is assumed to be concentrated at its centre.
Given that the gravitational field strength at the Earth’s surface is 9.81 N kg–1, show that the mass of the Earth is 5.99 × 1024 kg.
What is a ratio? Give several examples of ratios in everyday use.
a boy is sitting on a swing is suspended motionless. (his feet are not touching the ground). The swing seat is supported by two ropes attached to the branch of a tree.
The potential difference between two parallel plates of a condenser which are 4 mm apart is 800 V. (a) What is the potential gradient? (b) What is the force on a proton which is midway between the plates?
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Using a zero reference potential at infinity, determine the amount by which a point charge of 8 x 10-8 alter the electric potential at point 1.5 m away where the charge is (a) positive and (b) negative.
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Find the number of particles each carrying the charge of an electron that passes between the terminals of a 12-V car battery when a 60-W headlight is on for one hour.
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Two metallic plates are separated by a distance of 0.030 m at a potential difference of 60 V. Between the equipotential surfaces, there is a potential difference of 3.0 V. Find the spacing in this part of the field between the two metal plates.
The source of electrons at a point is at the middle to two large metal plates 2 cm apart. One of the metal plates is maintained at 2 400 V above the other. Find (a) the potential gradient at the source measured at right angle to the plates and (b) the potential gradient at the source measured along a line to a point 15 cm from one plate.
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Loop A has a current moving in the counterclockwise direction, viewed from above.
1. If the current in loop A decrease with time, what is the direction of the induced current in loop B? Will the two loop attrack or repel each other.
. A motorcycle of mass 100 kilograms travels around a flat, circular track of radius 10 meters with a constant speed of 20 meters per second. What force is required to keep the motorcycle moving in a circular path at this speed?
