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Spacecraft I, containing students taking a physics exam, approaches the Earth with a speed of 0.700c (relative to the Earth), while spacecraft II, containing professors proctoring the exam, moves at 0.300c (relative to the Earth) directly toward the students. The professors stop the exam after 80.0 min have passed on their clock.
(a) For what time interval does the exam last as measured by the students?
(b) For what time interval does the exam last as measured by an observer on Earth?
A contestant on "Survivor" is challenged to find buried treasure in a featureless desert. For how long should she run in order to retrieve the treasure
You shoot a 45 gram pebble straight up with a catapult whose spring constant is 320 N/m. The catapult is initially stretched by 0.20 meter. Find how high above the starting point does the pebble fly
Why does an object placed on a circular rotating table moves outward even though no unbalanced force is acting in that direction?
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 54.56 diopters, How far is the blackboard from her eyes
A contact lens is made of plastic with an index of refractionof 1.60. The lens has a focal length of +23.0 cm, What is the radius of curvature of the outer surface
A juggler throws a ball straight up into the air and it takes 3 seconds to reach its peak. Determine how many seconds will it take after that to fall back into his hand? Suppose he throws and catches the ball at the similar height
A 45.5-g golf ball is driven from the tee with an initial speed of 47.3 m/s and rises to a height of 30.4 m. evaluate the kinetic energy of the ball at its highest point
a 320-kg car is moving at 25.0 ms. suddenly after the breaks are hit to lock the wheels it comes to a screeching stop
A 75kg hiker climbs to the top of a 4000m -high mountain. The climb is made in 5.0h starting at an elevation of 3000m. Calculate the average power output in horsepower
What is the wavelength of a photon emitted from a hydrogen atom as an electron drops from the m=5 energy level to the n=2 energy level?
Quadrupole moments in the shell model
A speck of dust on a spinning DVD has a centripetal acceleration of 20 m/s^2. A) What is the acceleration of a different speck of dust that is twice as far from the center of the disk? B) What would be the acceleration of the first speck of dust if t..
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