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A thin layer of magnesium fluoride (n = 1.38) is used to coat a flint-glass lens (n = 1.61). (a) What thickness should the magnesium fluoride film have if the reflection of 717-nm light is to be suppressed? Assume that the light is incident at right angles to the film. nm
Three negative charges of equal magnitude q are placed along a straight line, Find the electrostatic force on middle (second) charge
n object is projected from the surface of the earth with a speed of 1.98×104 m/s. What is its speed when it is very far from the earth
question1a 30-kg girl is bouncing on a trampoline. throughout a certain interval after leaving surface of the
A 0.30-kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B. What is the total work done on the particle as it moves from A to B
A 5.0 kg object is moving to the right at 4 m/s and collides with another object of mass 10 kg moving to the left at 5 m/s. Find the momentum of the combined object
An 9.0 m, 240 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.60, and the ladder makes a 50.0° angle with the ground. How far up the ladder can an 880 N person climb before the l..
as two trains move along a track their conductors suddenly notice that they are headed toward each other. the figure
Two isotopes of carbon, carbon-12 and carbon-13, have masses of 19.93 × 10-27 kg and 21.59 × 10-27 kg, respectively. Determine the spatial separation between the two isotopes
A spherical weather balloon is filled with hydrogen until its radius is 3.10 m. What is the net force acting on the balloon and its instruments after the balloon is released from the ground?
A weightlifter stands up at constant speed from a squatting position while holding a heavy barbell across his shoulders, Draw a free-body diagram for the weight lifter
This hill slopes upward at a constant angle of 40 degree above the horizontal. The coefficient of static and kinetic friction between the hill and the rock are .75 and 0.20, respectively.
A 7.00×10-1 H coil with a resistance of 1.62×101 Ohm is in series with a 3.01×102 Ohm resistor. find the rms value of the potential difference across the resistor
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