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In the motion picture Danny Deckchair, based on an real event, a man attaches 42 helium-filled weather balloons to an aluminum deck chair, steps in, and takes off to experience a series of adventures. (Don't try this at home - or anywhere else!) The weight of the man plus the chair plus the balloons is 934 N. Each balloon is a sphere 1.60 m in diameter. The density of air at sea level and 15°C is 1.23 kg/m3. Find the net upward force on Danny and his vehicle right after he leaves the ground? Neglect the volume of the man and of the deckchair.
An airplane flies 200 km due west from city A to city B and then 315 km in the direction of 33.0° north of west from city B to city C.
A photon has an energy E and wavelength (lamda) before scattering from a free-rest electron. FInd the initial wavelength and the initial energy of photon
You are playing raquetball at the rec center. When you are 10 m away from the wall you hit a ball 26m/s towards the wall at an angle of 30 degrees. How long is the ball in the air before it hits the wall
An 82 kg lumberjack stands at one end of a 355 kg floating log. Both the log and the lumberjack are at rest initially. If the lumberjack now trots toward the other end of the log with a speed of 2.70 m/s relative to the log, what is the lumberjack's ..
What is the magnitude of the auto's average acceleration.
A 48.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.44 102 m/s from the top of a cliff 152 m above level ground, How much work has been done on the projectile by air friction
the volume of a gas is decreased by a constant external pressure of 0.200atm, changing from 2.10 litters to 0.58 litters. during this compression
A positively charged He+ atom has two protons in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
A balloon with a radius of 14cm and an electric charge of 3.75x10^-9 C is brought within the electric field of the larger balloon so their centres are 40cm apart. find the magnitude of the electric force exerted by this electric field on the small..
the radius of a typical human eardrum is about 4.2 .find the energy per second received by an eardrum when it listens
A 0.056 kg aluminum bullet traveling at 462 m/s strikes an armor plate and comes to a stop. what is the bullet's temperature change in degrees Celsius
A 7.0-kg object undergoes an acceleration of 2.7 m/s2. What is the magnitude of the resultant force acting on it
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