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A student sits on a freely rotating stool holding two weights, each of mass 3.09 kg. When his arms are extended horizontally, the weights are 1.08 m from the axis of rotation and he rotates with an angular speed of 0.753 rad/s. The moment of inertia of the student plus stool is 3.09 kg·m2 and is assumed to be constant. The student pulls the weights in horizontally to a position 0.302 m from the rotation axis.
(a) Find the new angular speed of the student.(b) Find the kinetic energy of the student before and after he pulls the weights inward.
Light in vacuum is incident on the surface of a slab oftransparent material. In the vacuum the beam makes an angle of36.9° with the normal to the surface, What is the index of refraction of the transparent material
when a parachute opens the air exerts a large drag force on it. this upward force is initially greater than the weight
a metal sphere of radius 80. mm is charged to a potential of -0.50 kv. with what velocity must an electron be fired
the first-order line of 571 nm light falling on a diffraction grating is observed at a 17.9 deg angle, at what angle will the third order be observed
At a given instant, the blood pressure in the heart is 1.50 104 Pa. If an artery in the brain is 0.43 m above the heart, what is the pressure in the artery
A 3.0x10 ² kg piano is being lifted at a steady speed from ground level straight up to an apartment 10 m above the ground. How much time does it take to lift the piano
A generator uses a coil that has 116 turns and a 0.455 T magnetic field. The frequency of this generator is 70.0 Hz, and its emf has an rms value of 115 V. Assuming that each turn of the coil is a square (an approximation), determine the length of th..
A flat coil of wire is used with an LC-tuned circuit as a receiving antenna. The coil has a radius of 0.35 m and consists of 480 turns. find the magnitude of the average emf induced in the antenna
An infinite non conducting sheet has a surface charge density σ = +5.80 pC/m2. (a) How much work is completed by electric field because of the sheet if a particle of charge q = +1.60 × 10-19 C is moved from the sheet to a point P at distance d = 3.56..
a 0.230-a current is charging a capacitor that has circular plates 10.9 cm in radius. the plate separation is 4.00 mm.a
One end of a 30 cm long aluminum rod with diameter 2 cm is kept at 460*C while the other end is held in water at 25*C
A 7.80-g bullet moving at 500 m/s penetrates a tree trunk to a depth of 6.00 cm. find the average frictional force that stops the bullet
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