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A weather balloon is designed to expand to a maximum radius of17m at its working altitude, where the air pressure is 0.030 atm and the temperature is 200 K. If the balloon is filled at atmospheric pressure and270K, what is its radius at liftoff?
m
A man slides along a long water slide and then being launched into the air to land in a water pool. Find the magnitude of the velocity at launch
A horizontal wire of length 0.59 m, carrying a current of 8.1 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force.
A 0.21-kg pinecone falls 15 m to the ground, where it lands with a speed of 9 m/s, How much work was done on the pine cone by air resistance
One average force F1 has a magnitude that is three times as large as that of another force F2. Both forces produce the similar impulse. The average force F1 acts for a time interval of 1.77ms. for what time interval does the average force F2 act.
A proposed ocean thermal-energy conversion (OTEC) system is a heat engine that would operate between warm water (26°C) at the ocean's surface, What is the maximum possible efficiency of the system
An archer wishes to shoot an arrow at a target at eye level a distance of 49.0 m away. what angle should the arrow make with the horizontal as it is being shot
A 50.0kg crate is being pulle along a horizontal smooth surface. What is the magnitude of the normal force acting on the crate
A spring of spring constant 11,000N/M is compressed by a block of mass 3kg is released from rest at the top of the incline plane. how far has the block moved down the incline
A possible means for making an airplane invisible to radar is to coat the plane with an antireflective polymer. how thick would you make the coating
A hollow sphere of radius 0.30 m, with rotational inertia I = 0.098 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at 27° to the horizontal. What is the speed of its center of mass now
A square loop of wire encloses area A1. What is the magnetic flux through loop A1
If a car traveling at 62 km/h will skid 22 m as its brakes lock, how far will it skid if it is traveling at 120 km/h when its brakes lock.
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