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If a hot air balloon floats at a constant elevation (it has reached equilibrium) where the local atmospheric pressure is 98 kPa (abs) and outside air temperature is 285 K, and the hot air inside the balloon is at 400 K (and also at the local atmospheric pressure since the balloon is open at the bottom), determine what volume the balloon must occupy if the basket, passengers and balloon material together weigh 5500 N? (Hint- the hot air inside the balloon also has weight)
A 9.8-kg object oscillates at the end of a vertical spring that has the spring constant of 1.75 104 N/m. The effect of air resistance is represented by the damping coefficient b = 3.00 N•s/m.
A 5kg block initially at rest is pulled to the ight along a horizontal surface by a constant, force of 30N acting at 53 degrees above the horizontal. Find the net work done on the block
The 3.90kg physics book shown is connected by a string to a 474.0g coffee cup. How far does the book slide before it has zero speed
A 2100 kg car traveling to the right at 32m/s is chasing a second car of the same mass that is traveling to the right at 10m/s.
A cylinder rolls without slipping down an incline that makes a 57° angle with the horizontal. What is the acceleration of the cylinder
In an experiment using an inclined track with a dynamics cart, the computer failed, find the cart's acceleration, mass, and the tension in the string connecting the cart to the accelerating 50g mass
Light of wavelength 580nm illuminates a diffraction grating. The second-order maximum is at angle 41.5 degrees
A recent discovery of human bones revealed only 26.5 % radiocarbon activity compared to live human bones. Estimate the age of the bones
A 1000 kg airplane touches down on an icy runway, heading northward at 110 km/h. Find the speed and direction of the combined wreckage
In a suspense-thriller movie, two submarines, X and Y, approach each other, traveling at 11 m/s and 20 m/s, How much is the Doppler shift
You need to prepare a 0.187mm-diameter tungsten wire with a resistance of 3.43 ohm. How long must the wire be
A 1500 microfarad capacitor and a 5600 microfarad capacitor are connected in parallel across a 12.0 V potential difference. Determine the total energy stored in the capacitors
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