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A weather balloon is designed to expand to a maximum radius of 10 meter when in flight at its working altitude where the air pressure is 0.047 atm and the temperature is 258 K. If the balloon is filled at atmospheric pressure and 363 K, find its radius at liftoff? Answer in units of m.
bonnie and clyde are sliding 390 kg bank safe across the floor to their getaway car. the safe slides with a constant
A 20 kg child is on the swing that hangs from a rope 3.5 m long. What is her speed at the bottom of her arc if she swings to out 90 degrees.
Two balls attached to strings have the same mass and volume, but are made of different materials. Which ball exerts a greater net force on the block
A train on a straight, level track has an initial speed of 37.0 km/h. What is the speed of the train at the end of this distance
The bush baby, a small primate, can leap straight upward to huge heights. The bush baby crouches, and then extends its legs upward for 0.16 meter. Find the acceleration while it is pushing off of the ground
A block that was initially at rest is sliding on a steel surface at 0.8 m/s for .2 m. Calculate the temperature rise from friction
when it falls back it hits the ground with speed v1=50m/s. The mass of the ball is m=20g. Illustrate what is the total work done by the drag force while the ball is in the air?
question1 a high speed train in japan travels a distance of 300 kilometres in 3.60x103 seconds. what is an average
It position is xo>0 and i give it a kick so that it moves back towards the origin and executed simple harmonic motion with amplitude 2xo. Find out its position as a fuction of time in the forum of x(t)=acos(wt-&)
A toroidal solenoid has a mean radius of 18.0cm and a cross-sectional area of 3.20cm2 and is wound uniformly with 85.0 turns. What is the mutual inductance of these coils
A world-class sprinter accelerates to his maximum speed in 4.2s . He then maintains this speed for the remainder of a 100-{\rm m} race, What is the runner's average acceleration during the first 4.2s
As you bounce a tennis ball of mass 5.10 10-2 kg off a wall, its velocity changes from vx = 10.8 m/s to vx = -7.9 m/s. Find the impulse applied to the ball
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