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1. A person on earth notices a rocket approaching from the right at a speed of 0.81c and another rocket approaching from the left at 0.55c. What is the relative speed between the rockets as measured by a passenger on one of them?
2. Quasars are believed to be the nucleii of galacies in the early stages of their formation. Suppose that a quasar radiates electro magnetic energy at the rate of 1.5 x 1041 W. At what rate in kg/s is the quasar losing mass as a result of this radiation?
A ball swings in a vertical circle at the end of a rope 1.40 m long. When the ball is 36.3° past the lowest point on its way up, Determine the magnitude of its radial acceleration
Sheena can row a boat at 3.10 mi/h in still water. She needs to cross a river that is 1.11 mi wide with a current flowing at 1.77 mi/h. Not having her calculator ready, How long does it take her to cross the river
What type of weather front will be responsible for the following weather forecast? "Cool today with rain becoming heavy by this afternoon. Slightly warmer tomorrow. "Winds south easterly becoming westerly to north westerly by the tomorrow morning."
What is the launch speed of a projectile that rises vertically above the Earth to an altitude equal to four times the Earth's radius before coming to rest momentarily
A beam of X-rays having a wavelength of .09nm impinges on an unknown crystal. What is the spacing between the atomic plates
A sphere of mass 2.8 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes an angle of 40° with vertical when at rest.
A 0.740 m long brass pendulum experiences a 20.0°C temperature increase, Find the ratio of the change in period to the original period, What is the change in the period
To explain why he seems to hang in the air, compute the ratio of the time he is above ymax/2 moving up to the time it takes him to go from the floor to that height. You may ignore air resistance.
On a very large distant screen, how many totally dark fringes (indicating complete cancellation) will there be, including both sides of the central bright spot
A piano tuner hears one beat every 2.16 s when trying to adjust twostrings, one of which is sounding 443 Hz, so that they sound thesame tone. How far off in frequency is the other string?
A spring with a constant of 32 N/m is placed on a horizontal smooth surface and a mass of 2.3 kg is pushed against it. What is the amount of potential energy stored in the spring when it is compressed
Your cell phone typically consumes about 320 mW of power when you text a friend. If the phone is operated using a lithium-ion battery with a voltage of 3.5 V, what is the current flowing through the cell-phone circuitry under these circumstances?
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