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An astronaut travels at a speed of 0.98c from the Earth to a distant star that is 6.4*1017 m away. If the astronaut is 26 years old when she begins her trip, how old is she when she arrives at the star?
Two point charges of + 40.0 ?C and - 10.0 ?C are separated by a distance of 20.0 cm. A +7.00 ?C charge is placed midway between these two charges. What is the electric force acting on this charge
A beam of light is emitted 8.2cm beneath the surface of a liquid and strikes the surface 7.2cm from the point directly above the source. what can you say about the index of refraction of the liquid
A concave mirror with focal length 24cm is placed 40cm to the left of the object. Where is the image formed by the mirror-lens system
A spotlight on a boat is y = 2.7 m above the water, and the light strikes the water at a point that is x = 9.4 m horizontally displaced from the spotlight (see the drawing). The depth of the water is 4.0 m. Determine the distance d, which locates the..
if the block is raised back to 100 meters without gaining or losing heat from the environment, What is the blocks temp after it was raised
A motorcyclist driving in a 60 {\rm{ km/h}} zone hits a stopped car on a level road. Find the minimum speed he could have been going just before the accident
A steel cable, ofcross-sectional area 2.70 10-3 m2, is kept under a tension of9.00 103 N. The density of steel is 7860 kg/m3 (this is notthe linear density). At what speed does a transverse wave movealong the cable?
A jeweller working with a heated 44 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 94 degrees Celsius, what mass of water at 25 degrees Celsius is necessary to lower the ring's temperature to 35 d..
a 10 kg block rests on top of a spring with stiffness 500 nm. what force is necessary to compress the spring to a
A ship sets out to sail to the point 158 km due north. An unexpected storm blows the ship to a point 134 km due east of its starting point. (a) How far (in km) and (b) in what direction (as an angle from due east, where north of east is a positive an..
A man holds a double-sided spherical mirror so that he is looking directly into its convex surface, 35 cm from his face. The magnification of the image of his face is +0.13. What will be the image distance when he reverses the mirror (looking into..
The magnitude of a uniform electric field between the two plates is about 2 × 105 N/C. If the distance between these plates is 0.1 cm
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