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a stone is dropped into a well of depth 44 .1 m. the splash of water is heard after 3.12 s .calculate the velocity of sound , given g = 9.8 m/s2
An express subway train passes through an underground station. It enters at t = 0 with an initial velocity of 18.5 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. How fast is it going when the nose leaves the station
A 60 kg skier is in a tuck and moving straight down a 30 degree slope. What is the resultant of the external forces that act on the skier
A string with a length of 0.8m is fixed at both ends. what is the frequency associated with its longest wavelength
An elevator at the CN Tower in Toronto, Canada, What is the minimal power required for the motor of the elevator
The driver of a 1720kg car traveling on a horizontal road at 102km/h suddenly applies the brakes. How many meters does it travel before stopping under these conditions
When reading a compact disc, the player begins by reading theinformation near the center of the disc by rotating the CD at 450rpm. What is its rate change of the CD's angular momentum
A 3.10kg fish is attached to the lower end of a vertical spring that has negligible mass and force constant 860N/m. What is the maximum speed of the fish as it descends
Explain the physical phenomenon which causes the lower limit of the tunneling resistance of the source-QD and drain-QD junctions in a single electron transistor?
What observations did Galileo make that reinforced the heliocentric model ? Why did these observations contradict the geocentric model ? Why could these observations not have been made before Galileo ?
A uniform electric field, with a magnitude of 490 N/C, is directed parallel to the positive x-axis. If the electric potential at x = 4.00 m is 1 000 V, what is the change in potential energy of a particle with a charge of + 2.60 x 10-3 C as it moves ..
a typical flute is about 66 cm long. a piccolo is very similar instrument though it is similar with a length of about
Wildlife biologists fire 19g rubber bullets to stop a rhinoceros, charging at 0.83 m/s. The bullets strike the rhino and drop vertically to the ground. What impulse does each bullet deliver
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