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The propeller of an toy airplace is at rest when the controller starts the engine. Two seconds later, the propeller is rotating at 3.13 rad/s. Through how many rotations has the propeller of the toy airplane rotated during those first two seconds?
A 11.9-m-long wire of mass 132g is stretched under a tension of 250N . A pulse is generated at one end, Where will the two pulses first meet
The best laboratory vacuum has a pressure of about 1 × 10-18 atm, or 1.010 × 10-13 Pa. How many gas molecules are there per cubic centimetre in such a vacuum at 293K.
A projectile is fired with an initial speed of 60.7 m/s at an angle of 35.4 above the horizontal on a long flat firing range. Determine the total horizontal distance covered
A small fly of mass 0.21g is caught in a spider's web. What is the value of the effective spring stiffness constant k for the web
The average frictional force exerted on him by the pole has a magnitude of 815 N, and his speed at the bottom of the pole is 3.7 m/s. Explain how far did he slide down the pole?
Imagine a "free" electron and a "free" proton held midway between the plates of a charged equivalent plate capacitor. When released, how do their accelerations and directions travel compare.
a ball dropped from a height of 4.00m makes an elastic collision with the ground. assuming no mechanical energy is lost
A capacitor is charged up so that 500 nC of charge are on each plate. The capacitor is 2 cm x 3 cm, and is .5 cm between each plate. At what angle does it leave the second capacitor
0.025m3 of oxygen at 150 kpa in a piston cylinder device expands polytropically with n 1.2 to a volume of 0.25m3. what
A Ferris wheel is moving at an initial angular velocity of 1.0 rev/53 s. If the operator then brings it to a stop in 2.8 min, what is the angular acceleration of the Ferris wheel
A long rod of lenght " L " and cross sectional area "A" is weighted such that when it is placed in a bucket of water it floats vertically. determine the magnitude of the buoyant force on the rod
A professional boxer hits his opponent with a 1000 N (225 lb) horizontal blow that lasts for 0.15 s. Calculate the impulse imparted by his blow
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