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The mass of hot-air balloon and its occupants is 320 kg (excluding the hot air inside the balloon). The air outside the balloon has a pressure of 1.01?105 Pa and a density of 1.29 kg/m3. To lift off, the air inside the balloon is heated. The volume of the heated balloon is 650 m3. The pressure of the heated air remains the same as that of the outside air. To what temperature (in K) must the air be heated so that the balloon just lift off? The molecular mass of the air is 29 u.
A fisherman's scale stretches 4.2 cm when a 2.6 kg fish hangs from it. What will be the amplitude and frequency of vibration if the fish is pulled down 3.0 cm more and released so that it vibrates up and down
A properly motivated kangaroo can jump over an object. what is the velocity of the kangaroo, just when it returns to the ground
What is the pressure change in water going from a 3.2- cm-diameter pipe to a 1.8- cm-diameter pipe if the velocity in the smaller pipe is 8.0 m/s
The train on the right accelerates leftward at 0.82 m/s2.How far does train on the left travel before the front ends of the trains pass.
A person consumes 1800 Calories per day (about seven Dunkin' Donuts). How much would seven Dunkin' Donuts cost
A 24kg golden retriever spots a squirrel and gives chase. How much time does it take the dog to go from rest to 10.8 m/s
A large log is located on the icy surface of a frozen pond; for this problem, the ice may be assumed to be a frictionless surface. find the total horizontal force acting on the log
Using a grating with a spacing of 0.00046 cm, a line (which looks like red light) appears 27 cm from the central line on a screen. The screen is 1.9 m from the grating. What is the wavelength of the light?
Two towboats are pulling a plane in the Hudson River. Towboat 1 pulls with a force V1 = 610.0N, at an angle of ?1= 41.0o. What is the direction of the net force
An ideally efficient airplane engine provides work as heat flows from 1400 K burned gases to 260 K air
An automobile has a total mass of 2200 kg. It accelerates from rest to 70 km/h in 40 s. Assume each wheel is a uniform 44 kg disk. find the total kinetic energy of the automobile
A space station, in the form of a wheel 100 m in diameter, rotates to provide an "artificial gravity" of 2.10 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of rotation of the wheel
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