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(a) A research balloon bound for the stratosphere is filled at sea level with 800 m3 of helium whose initial temperature is 285 K. The balloon is released, and it climbs to an altitude where the air pressure is 0.045 times its sea-level value. If the helium expands adiabatically, what is the balloon's volume now?
(b) What is the temperature of the helium?
A patient has a near point of 45.0 cm and far point of 85.0 cm. Calculate the power lens needed to correct the patient's far point
The time constant of an RL circuit with L = 25 mH is five times the time constant of an RC circuit with C = 40 µF. What is the time constant of the RL circuit
A person lifts a 950N box by pushing it up an incline. If the person exerts a force of 350N along the incline, what is the mechanical advantage of incline.
Determine the force (in N) of the car on truck all through the impact. Call this force positive if it points to the east, and negative if it points to the west.
A plane leaves the airport in Galisto and flies 175 km at 68.0^circ east of north and next changes direction to fly 260 km at 48.0^circ south of east, after which it makes an immediate emergency landing in the pasture.
A series RCL circuit is comprised of a 3.00-mH inductor and a 5.00-µF capacitor. What is the resonant frequency of this circuit
A block of wood of mass 2 kg is suspended by long, light strings and is at rest. A bullet of mass 40 g, strikes and remains in the block, causing it to swing. The utmost height of the block above its rest position is 51 cm.
A stone is thrown out the window of high rise builind at an angle of 37.5° to the horizontal with an initisl speed of 22.0 m/d. from what height was the stone launched
A subway train has three cars, each weighing 1.20 x 10^5 N. The frictional force on each car is 103 N, and the first car, acting as an engine, exerts a horizontal force of 4.80 x 10^4 N on the rails.
A 13 g bullet traveling 215m/s penetrates a 2 kg block of wood and emerges cleanly at 157m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after bullet emerges.
You jump from the top of a boulder to the ground 1.85 m below. Calculate your deceleration on landing
An ocean liner leaves New York City and travels 16.10 ° north of east for 234 km. How far east and how far north has it gone? In other words, what are the magnitudes of components of the ship's displacement vector in directions (a) due east and (b..
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