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An airplane can be made invisible to radar by coating the plane with a thin layer of an antireflective material. If radar waves have a wavelength of 3.0 cm, and the polymer has an index of refraction of n = 1.42, how thick would you make the coating? Two glass microscope slides touch on one side. On the other side, a piece of hair is inserted at the far end between the slides, with the long axis of the hair parallel to the edges of the slides. This creates an air wedge between the slides, with one end having a thickness of 0 and the other end having a thickness of the hair, which is 50 microns. How many dark fringes are observed when 600 nm light illuminates the slides from directly above.
A 3m-long rigid beam with a mass 140 kg is supported at each end. An 75 student stands 2m from support 1.
A baseball (m = 155 g) approaches a bat horizontally at the speed of 40.5 m/s (91 mi/h) and is hit straight back at a speed of 45.5 m/s (102 mi/h).
While a roofer is working on a roof that slants at 44.0 above the horizontal, he accidentally nudges his 93.0 toolbox, causing it to start sliding downward, starting from rest.
An underwater diver sees the sun 58 above horizontal. How high is the sun above horizon to a fisherman in a boat above the diver.
An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. The maximum speed of the object is 1.25m/s.
An archer pulls her bow string back 0.40m by exerting a force that increases uniformly from zero to 25 N. How much work does the archer do in pulling back the bow.
The bullet becomes embedded in the block. If the bullet block system compresses the spring by a highest of 84- cm, what was the speed of the bullet at impact with the block.
Atoms are typically spaced about 0.2 nm apart. At that spacing, how many atoms would be found in a line 4.93 inches long?
A 220 g block on a 50 cm long string swings in a circle on a horizontal, frictionless table at 95.0 rpm. what is the tension on the string.
Question on a planet similar to Earth
The magnetic field has been measured to be horizontal everywhere along a rectangular path x = 22 cm long and y = 5 cm high. Along the bottom the average magnetic field B1 = 1.3 10-4 tesla, along the sides an average magnetic field B2 = 1.0 10-4 te..
Determine the least value of n for which there is total internal reflection on the vertical surface.
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