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A hot-air balloon achieves its buoyant lift by heating the air inside the balloon, which makes it less dense than the air outside. Suppose the volume of a balloon is 1800 m3 and the required lift is 3300 N (rough estimate of the weight of the equipment and passenger). Calculate the temperature of the air inside the balloon which will produce the required lift. Assume the outside air is an ideal gas at 0°C. What factors limit the maximum altitude attainable by this method for a given load?
A dentist's drill starts from rest. After 3 second of constant angular acceleration it turns at a rate of 2.3 x 104 rev/min. Determine the drill angular acceleration
An electric fan is running on HIGH. After the LOW button is pressed, the angular speed of the fan decreases to 83.8 rad/s in 1.75 s. Determine the initial angular speed of the fan
Two masses are connected by a light string passing over a light, frictionless pulley, Determine the speed of each object when the two pass each other
a brass plug is to be placed in a ring made of iron. at 20 c the diameter of the plug is 8.852 cm and that of the
A merry go round consists of a flat disk mounted horizontally. What is the angular acceleration of the ride
A disk, initially rotating at 106 rad/s, is slowed down with a constant angular acceleration of magnitude 2.24 rad/s2. How much time does the disk take to stop
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.90×10^6 N, one at an angle 17.0 degrees west of north, What is the total work done by the two tugboats on the supertanker
Two billboard workers stand on a 5.0 m scaffold supported by ropes at each end. what is the tension in each of the two ropes
It has been a while since I had calculus so I am having trouble remembering how to multiply the equations out. Can anyone do a step - by - step process?
A beam of initially unpolarized light passes through a sequence of three ideal polarizers.
A string with length L = 0.80 m and linear density µ = 2.5 g/m is under tension F = 4.0 N. The string is fixed at each end and when driven at the frequency of the n = 3 harmonic, a standing wave with amplitude A = 0.50 cm is produced.
on a snowy day with the temperature near the freezing point the coefficient of static friction between a cars tires and
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