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A thin uniform rod is rotating at an angular velocity of 8.2 rad/s regarding an axis that is perpendicular to the rod at its center. As the drawing indicates, the rod is hinged at two places, one-quarter of the length from each end. Without the aid of external torques, the rod suddenly assumes a "u" shape, by the arms of the "u" parallel to the rotation axis. What is the angular velocity of the rotating"u"?
An ac generator producing 10 V (rms) at 300 rad/s is connected in series with a 25-? resistor, The rms current in the circuit (in mA) is
What isthe total random kinetic energy of all the molecules in one mole of helium at a temperature of360 K? With what speed would a mole of helium have to move so that the kinetic energy ofthe mass as a whole would be equal to the total random kineti..
Mary (mass = 33 kg) likes to slide too. On a nearby playground there is a straight metal slide with a vertical drop of 2.0 m and a length (measured along the slide) of 3.3 m, What was the net change in potential energy when she went from the top of..
Light from a laser strikes a diffraction grating that has 5 300 grooves per centimeter. The central and first-order principal maxima are separated by 0.488 m on a wall 1.76 m from the grating.
A copper bowl of mass m1 contains a mass m2 of water, both at temperature T (which is below the boiling point of water). How much energy is transferred to the water as heat
a car is moving with speed 16.6 ms due south at one moment and 29.3 ms due east 9.00 seconds later. determine the
q1. a 20 kg block is at rest on a horizontal floor. if you push horizontally on the 20 kg block with a force of 50 n it
A baseball (mass 0.14 kg, radius 3.7 cm) is spinning with an angular velocity of 56 rad/s. What is its rotational kinetic energy
A weight is attached to one end of a lightweight spring held at other end. When the weight comes to rest, the spring is stretched 20 cm beyond its natural length. In another condition the weight is completely immersed in water.
A stationary motion detector sends sound waves of frequency 0.135 MHz toward a truck approaching at a speed of 49.2 m/s. What is the frequency of the waves reflected back to the detector? (Takethe speed of sound to be 343 m/s.)
The intensity (in W/m2) of one sound is 2.97 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level of the louder sound
In the figure below, two skaters, each of mass 35 kg, approach each other along parallel paths separated by 2.2 m. They have opposite velocities of 1.9 m/s each. What is the angular speed of the skaters
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