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You're designing a toy rocket to be launched by a spring. The launching apparatus has room for a spring that can be compressed 14cm, and the rocket's mass is 65 g. If the rocket is to reach analtitude of 35 m, what should be the spring constant?
Tests of lung capacity show that adults are able to exhale 1.5 liters of air through their mouths in as little as 1.0 second. If a person blows air at this rate through a drinking straw with a diameter of 0.60 cm, what is the speed of air in the stra..
Two small identical conducting spheres are placed with their centers 0.70 m apart. One is given a charge of 1.2 x 10^-8 C, Find the electrostatic force exerted on one sphere by the other
A 1.83 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is needed to begin moving the book
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.29 × 10-6 T. What is the intensity S of the wave
You are driving north on 107th Avenue at a speed of 28.7 mph. At what frequency do you year the siren
A 10-turn square coil of area 0.036m2 and a 20-turn circular coil are both placed perpendicular to the same changing magnetic field. What is the area of the circular coil
Three identical train cars, coupled together, are rolling east at speed . A fourth car traveling east at 2 catches up with the three and couples to make a four-car train. What is the speed of the five-car train
A long, current-carrying solenoid with an air core has 1670 turns per meter of length and a radius of 0.0194 m. What is the mutual inductance of this system?
A portable x-ray unit has a step-up transsformer, the 120 V input of which is transformed to the 100kV output needed by the x-ray tubr, what is the number of loops in the secondary
what fraction of the power radiated by the sun is intercepted by the planet uranus? the radius of mercury is 2.56
A small glass bead has been charged to + 30{\rm nC}. What is the magnitude of the acceleration of a proton that is 3.0{\rm cm} from the center of the bead
A comet of mass 4.5 E22 kg moving at 10000 m/s collides withthe earth, initially at rest, and stick. Find the final speed of the earth
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