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A cord is 20cm long, four complete waves fit along its length when vibrated 30 times per second for the waves on the cord. What is the wavelength? What is the frequency? What is the speed?
When a potential difference of 188 V is ap- plied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of magnitude 43 nC/cm2. What is the spacing between the plates
A mass-spring system oscillates with an amplitude of 4.60 cm. If the spring constant is 240 N/m and the mass is 435 g, determine the mechanical energy of the system. Calculate the speed of the sphere's CM at the bottom of the ramp. Determine the m..
A piano tuner stretches a steel piano wire with a tension of 765 N. The steel wire has a length of 0.900 m and a mass of 6.75 g. What is the frequency of the string's fundamental mode of vibration
a sound source of 500 hz with an acoustic power of 110 of a watt how do you find the intensity 12 a m from the source
The field just outside a 3.43-cm radius metal ball is 2.79E+2 N/C and points toward the ball. What charge resides on the ball
a speeder tries to explain to the police that the yellow warning lights on the side of the road looked green to her
How fast must the car be travelling just as it leaves the cliff in order to clear the river and land safely on the opposite side.
When two soap bubbles touch, the larger is inflated by the smaller until they form a single bubble. What is the gauge pressure inside a soap bubble with a 1.50-cm radius
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 7.50 m/s at an angle of 25.0° below the horizontal. It strikes the ground 5.00 s later. (a) How far horizontally from the base of the building does..
A stone is thrown horizontally at 70.0 m/s from the top of a very tall cliff. Calculate its horizontal position and vertical position at 2.00 s intervals for the first 10.0s
You have built a homemade skate board for your nephew out of a plank and a set of wheels. How fast was your nephew moving when his feet left the skateboard
A force of 10N acts on two blocks on frictionless surface. the first block is 3kg, and the second block is 2kg. what is the acceleration of the system? what force does the 3kg block exert on the 2kg block? what force does the 2kg block exert on th..
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