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Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 10 cm. You take the balloon in an airplane, where the pressure is 0.80 atm. If the temperature is unchanged, what's the balloon's new radius? If the tempearture is unchanged, what's the balloon's new radius?
A laser pulse has an energy of 19 J and a beam radius of 2 mm. The pulse duration is 9 ns and the energy density is constant within the pulse. What is the total energy density within the pulse
A pulley with a radius of 10.0 cm is mounted on an axle that passes through the center of the pulley. calculate the number of revolutions the pulley has made
The y-component of a dust particle's velocity is measured with an uncertainty of 1.0×10?6 m/s, What is the limit of the accuracy to which we can locate the particle along the y-axis
The moment arm of the should abductor muscles is approximately 5 cm from the axis of roation of shoulder joint, calculate the horizontal component of the joint reaction force
describe the importance of rare earth elements in science and technology. assess the most common uses of these
A 20 kg loudspeaker is suspended 2.0m below the ceiling by two cables that are 30 degrees from vertical. what is the tension in the cables
A projectile of mass 0.1kg travelling horizontally through the air with speed v(t) experiences a drag force D(t) whose magnitude is given by: D(t)=0.001[v(t)]^2. Calculate the speed of the projectile
A uniform disk of radius 0.46 m is mounted on a frictionless, horizontal axis. A light cord wrapped around the disk supports a 0.58 kg object. When free from rest the object falls with a downward acceleration of 4.1 m/s squared.
question1an artillery shell is fired with an initial velocity of 310 ms at 57.0deg above the horizontal. it explodes on
An ideal heat engine absorbs 81.2 kJ of heat and exhausts 66.1 kJ of heat in each cycle, How much work is done in a cycle
A small block with mass .2kg is released from rest at the top of a frictionless incline. how far down the incline does it travel in 2s
The drive propeller of a ship starts from rest and accelerates at 2.50 x 10-3 rad/s2 for 2.15 x 103 s. find the total angular displacement of the propeller
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