How many revolutions does it make during the time
A motor spins an 2 kg block around on an 80 cm arm at 200 rpm. The blosk is supported by a steel table after the motor stops. How long does the block take to come to rest? How many revolutions does it make during this time?
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A physics student throws a bowling ball straight up into the air. THe ball was in the air for a total of 8.44 seconeds before it was caught at its orignial position. What was the intial velocity of the ball? And how high did it rise??
What should be the refractive power (in diopters) of her glasses (worn2.0 cmfrom the eyes), so she can read the newspaper at a distance of 24 cmfrom the eyes?
A physics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and simultaneously shouts "Help". When she has fallen for 3.0 , she hears the echo of her shout from the valley floor below. The speed of sound is 340.
Draw a PV diagram of the process. Label the initial state of the gas with an "I" and the final state with an "F". Assume the process follows a linear path.
Consider a tank containing 40.0 kg of water. Neglecting the heat capacity of the tank, how much heat (in joules) would be required to raise the water temperature of from 1 to 94 degrees Celsius?
If = 533 , what is the minimum diameter of the circular opening from which the laser beam emerges? The earth-moon distance is 3.84×105.
A piece of Nichrome wire has a radius of 7.2 x 10-4 m. It is used in a laboratory to make a heater that dissipates 4.60×102 W of power when connected to a voltage source of 140 V. Ignoring the effect of temperature on resistance, estimate the
Now consider a nucleus of charge Ze with two electrons. Use the variational principle to estimate the ground-state energy.
When the car is stationary, its horn emits a sound whose frequency is 9.90 102 Hz. The speed of sound is 343 m/s. What is the acceleration of the car?
A 122 cm length of string has a mass of 1.70 g. It is stretched with a tension of 6.60 N between fixed supports. What is the lowest resonant frequency (first harmonic, fundamental) of this string? And the frequency of the second harmonic for this
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