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A 35 mm camera with interchangeable lenses is used to take a picture of a hawk that has a wing span of 1.8 m. The hawk is 21 m away. What would be the ideal focal length of the lens used so that the image of the wings just fills the width of the film, which is 36mm?
Apollo 11 (total mass 43,100 kg) was in an orbit 11 km above the surface of the moon. What was the speed of Apollo 11 while it was orbiting the moon
The back wall of a home aquarium is a mirror that is a distance of 33.0 cm away from the front wall. The walls of the tank are negligibly thin, Calculate the apparent distance between the fish and the front wall
A 2.5-m-long steel wire in a musical instrument has a radius of 0.02 mm. When the wire is under a tension of 91 N, how much does its length change
A Toyota Prius driving north at 61.0 {rm mph} and VW Passat driving south at 41.0 {rm mph} are on the same road heading along each other (but in different lanes). (We take the positive direction to be north.)
Calculate the power required by an object to lift another object
A dolphin in seawater at a temperature of 25 °C emits a sound wave directed toward the ocean floor 246 m below. How much time passes before it hears an echo? (The speed of sound in ocean water is 1533 m/s.)
Electrons are accelerated through a voltage difference of 15.4 kV inside a television's cathode ray tube. What is the de Broglie wavelength of the electrons
A Sodium surface, which has a work function ? of 2.46 eV is illuminated with ? = 300nm light. Find the threshold frequency for Sodium
The coefficient of static friction between the block and table's surface is &mu s = 1/3. The mass of the block that is hanging down is n1 Kg. The tangent of the angle shown in the figure is tan & theta = n2. What is the minimum value of mass, n3 Kg t..
The electric field between the plates of a paper-separated (K=3.75) capacitor is 8.19×104. determine the area of each plate
The function y(x, t) = (25.0 cm) cos(?x - 20?t), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant when that point has the displacement y = +22.0 cm?
What is momentum of the block
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