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a balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 1.6 kg. Its volume is 3.5 m^3. the density of air is 1.3 kg/m^3. What is the magnitude of the initial acceleration of the balloon?
A soccer player kicks the ball toward a goal that is 23.0 m in front of him. Find the speed of the ball when the goalie catches it in front of the net
A magnetic computer disk 8 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. A small dot is painted on the edge of the disk. The disk accelerates at 600 rad/s^2 for 1/2 s , then coasts at a steady angular velocit..
When ultraviolet light with a wavelength of 246nmfalls upon a clean metal surface, find the photoelectric threshold wavelength for this metal
An electron moves to the right with a speed of 0.84c relative to the laboratory frame. Find the speed of the proton relative to the laboratory frame
A 2.5-kg block is attached to a spring with k=100 N/m and compress it with a distance of 0.40 m. What is the mechanical energy of the block
A beaker with a capacity of exactly 100 mLcontains 99.5mL of ethanol at 26?C. at what temperature will it overflow
illustrate what is the new horizontal distance L between the base of the slide and the splashdown point of the person?
An undersea research chamber for aquanauts is spherical with an external diameter of 7.93 m. The mass of the chamber, when occupied, is 64800 kg. What is the buoyant force on the chamber
The molar volume of a certain solid is 142 mL at 1 bar and 427.15K, its melting temperature. Calculate the enthalpy and entropy of fusion of the solid
You are the technical consultant for an action-adventure film in which a stunt calls for the hero to drop off a 23.7-m tall building and land on the ground safely at a final vertical speed of 3.85 m/s. How many revolutions does the drum make during..
Two objects are charged and their centers are separated by 31.6 cm. Object A is charged to 61 nC and object B is charged to 54 nC. What is the magnitude of the electrostatic force between them.
A 69-g firecracker is at rest at the origin when it explodes into three pieces. Find the velocity of the third piece
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