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A bicyclist rides 3.01 km due east, while the resistive force from the air has a magnitude of 7.71 N and points due west. The rider then turns around and rides 3.01 km due west, back to her starting point. The resistive force from the air on the return trip has a magnitude of 7.71 N and points due east. Find the work done by the resistive force during the round trip.
Measurements of the radioactivity of a certain isotope tell you that the decay rate decreases from 8305decays per minute, What is the half-life T1/2 of this isotope
Brewed coffee is often too hot to drink right away. You can cool it with an ice cube, but this dilutes it. compute the final temperature of the coffee
An eagle with 1.8m wingspan flaps its wings 21 times per minute, each stroke extending from 42%u2218above the horizontal to 42%u2218 below. What's the average tangential velocity of the wingtip
An astronaut on the surface of the Moon fires a cannon to launch an experiment package, which leaves the barrel moving horizontally. What time interval does this trip around the Moon require
A Carnot engine operates between temperatures of 747 and 324 K. Calculate what the efficiency would be if (a) the temperature of the hot reservoir were raised by 42.5 K or (b) if the temperature of the cold reservoir were lowered by 42.5 K. (Give ..
Rubidium atoms are cooled to 0.22 uK in an atom trap. What is their de Broglie wavelength
A sound wave traveling at 343 m/s is emitted by the foghorn of a tugboat. An echo is heard 1.70 s later. How far away is the reflecting object
a solid sphere of brass (bulk modulus of 1.4x10^11 N/m^2) with a diameter of 2.3 m is thrown into the ocean. by how much does the diameter of the sphere
astronauts use a centrifuge to simulate the acceleration of a rocket launch. the centrifuge take 20.0 seconds to reach top speed, what is the astronauts tangential acceleration during the first 20.0 s
You wish to reduce the intensity of a beam of 1-MeV gamma rays from 5.12 x 10^7 per second to 2 x 10^5 per second. What thickness of aluminum is required
A water dispenser for pets has an invented plastic bottle ( the water is dyed blue for contrast).When a certain amount of water is drunk from the bowl, Explain the operation of the dispenser
Suppose you have a near-point distance of 16 cm. The angular resolution of the eye is determined by diffraction, What is the smallest object your bare eye can resolve
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