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A hot air balloon is accelerating upward under the influence of two forces, its buoyant force and the weight. For simplicity, consider the weight to be only that of the hot air within the balloon, thus ignoring the basket and the balloon fabric. The hot air inside the balloon has a density of ρhotair = 0.93 kg/m3, and the density of the cool air outside is ρcool air = 1.29kg/m3. Evaluate the acceleration of the rising balloon?
A huge cannon is assembled on an airless planet. The planet has a radius of 6.00×106 m and a mass of 2.09×1024 kg. What height does the projectile reach above the surface
A gas is allowed to expand at a constant pressure of 10^7 Pa, its volume increasing by 2m^3. What is the net work done by the gas during the entire process
Sources A and B emit long-range radio waves of wavelength 440 m, What is the magnitude of the phase difference at the detector
twin brothers each of mass 50 kg sit in a symmetric canoe of mass 40 kg. each boy sits 1.5m from the center of the canoe as they toss a basketball(mass= .60kg) back and forth. how much does the center of canoe move as the ball moves from one brothe..
A block (m = 3 kg) is sitting on a horizontal frictionless table. A spring (k = 500 N/m) is mounted at the side of this block so that when the block is used to compress the spring, with what velocity does it slide across the table
A solenoid is made by tightly wrapping a wire 0.30mm in diameter around a 4.0mm diameter cylinder. a) If the inductance of this solenoid is to be 10µH what must the length of the winding be
Two particles are separated by a certain distance. The force of gravitational interaction between them is Fsub 0. Now the separation between the particles is tripled. Find out the new force of gravitational interaction Fsub 1. Express your answer ..
Imagine you are sitting in a room full of oxygen molecules at 300K. If the room has a volume of 1.2105 m3, what is the number of oxygen molecules in the room
An object which has a mass of 3.80 kg has been placed in a small spot of sun for 11.3 min which is shining through a window in a house. what is the temperature of the object after this time period
q1. sunlight enters a room at an angle of 31 above the horizontal and reflects from a small mirror lying flat on the
The dial on an FM radio contains numbers ranging from about 88 to about 108. What is the corresponding range of wavelengths
illuminate the object with the flashlight. One way to produce artificial gravity in a space station is to spin it.
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