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A spacecraft flies towards the Earth at a speed of 0.8c and shines a laser at an observer on Earth. At what speed would the laser light be moving when measured
(a) a person aboard the spacecraft?
(b) the oberserver on Earth?
A wave on a string has a speed of 397 m/s. If the tension in the string is 128 N and its length is 1.9 m, what is the mass of the string
An object starts from rest at t= 2 s at an initial position of x = 7.2 m and moves with constant acceleration. What is the magnitude of the acceleration of the object
Suppose you are using total internal reflection to make an efficient corner reflector, what must be the minimum index of refraction of the material
Two non-conducting infinite planes of uniform surface charge ?1 = 13.11 µC/m2 and ?2 = ?3.5 µC/m2 are parallel to each other and d = 0.129 m apart, What is the electric field outside the planes, at A
Hexane (C6H14) burns with air (21 % O2, 79 % N2) in stoichiometric proportions. Also determine the mole fraction of each species in the product mixture
A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. What is the mass of the meter stick
An astronomical telescope is designed with an overall magnification of 80x. The objective has a focal length of 98.0 cm. How far should the eyepiece be from the objective
If the alternating current in a circuit is described by the equation I=20sin60t, what are the peak current and frequency
A negative lens has a focal length of -10 cm. An object is located 20 cm from the lens. determine How far from the lens is the image
A sample of wood from an archaeological excavation is dated by using a mass spectrometer to measure the fraction of 14C atoms. What is the wood's age
The driver of a 1550 kg car, initially traveling at 12.1 m/s, applies the brakes, bringing the car to rest in a distance of 19.5 m. Find the net work done on the car
A 6 m board of mass 7 kg is hinged at one end, with a 60 kg block nesting on the board 245 cm from the hings. A force ~F is applied vertically at the other end to lift of the board. Find the force exerted by the hinge
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