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Q1. A lightbulb emits a spherical wave. If the intensity of the emitted light is 1.2 W/m2 at a distance of 2.5 m from the bulb, what is the intensity at the distance of 4.8 m?
Q2. A 18.0 kg block is dragged over a rough, horizontal surface by a constant force of 77.6 N acting at an angle of 35? above the horizontal. The block is displaced 10.8 m, and the coefficient of kinetic friction is 0.149.
The acceleration of gravity is 9.8 m/s2. If the block was at first at rest, find out its final speed.
What is the length of the greatest and thinnest string that can be located under a tension of 860 without breaking .
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Estimation instantaneous rate of evaporation
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An oil drop carries one excess electron and weighs 9.2 10-15 N. What electric field strength is necessary to suspend drop so it is motionless.
What is linear acceleration
A curve of radius 40 m is banked for a design speed of 100 km/h. If the coefficient of static friction is 0.30 (wet pavement), at what range of speeds can a car safely create the curve?
Evaluate the electrostatic energy of two opposite charges
What is the ratio of the amplitude of the damped oscillation
An average force of 201 N is exerted to draw the string back 1.3 m. unless otherwise directed, imagine that air resistance is negligible. Illustrate energy bar graphs to solve the difficulty .
Determine the magnitude when the force on the wire
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