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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 electric stove burner with 35-ohm resistance consumes 1.5 kW of power. At what voltage does it operate
A projectile is shot from the surface of Earth by means of a very powerful cannon. what was the speed of the projectile when it left the cannon
Light of wavelength 517 nm is used to illuminate normally two glass plates 22 cm in length that touch at one end, How many bright fringes appear along the total length of the plates
A rifle shoots a 4.50g bullet out of its barrel. The bullet has a muzzle velocity of 965 m/s just as it leaves the barrel. For how long a time is the bullet in the barrel
Two point charges Q1 = +5.30 nC and Q2 = ?1.60 nCare separated by 55.0 cm. What is the potential energy of the pair of charges
A 61 kg skater and a 77 kg skater stand at rest on frictionless ice. They push off, and the 61 kg skater moves at 1.9 m/s in the + x-direction. What's the other's velocity? (Express your answer to two significant figures and include the appropriate u..
Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 611 rad/s. how many minutes can it operate between chargings
A parallel-plate capacitor has 3.95 cm2 plates that are separated by 4.29 mm with air between them. If a 11.2 V battery is connected to this capacitor, how much energy does it store? The value of the permittivity of a vacuum is 8.8542 × 10 ^?12 C^..
You've been given the task of designing a "water couch"-that one could lie on, floating on a lake, What minimum volume must the slab have so that a 45 kg teenager can lie on top of the slab without getting wet
The distance between two successive minima of a transverse wave is 2.57 m. Five crests of the wave pass a given point along the direction of travel every 12.4 s. Find the frequency of the wave
A car with a mass of 1234 kg is travelling around a circular track with a radius of 100.m and a tangential velocity of 23 m/s. Determine the centripetal acceleration of the car
Two vectors have magnitudes of 10m and 15m. the angle between them when they are drawn with their tails at the same point is 65 degrees. what is the component of the longer vector along the line of the shorter?
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