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A student sitting on a frictionless rotating stool has rotational inertia 0.90 kg*m^2 about a vertical axis through her center of mass when her arms are tight to her chest. The stool rotates at 6.80 rad/s and has negligible mass. The student extends her arms until her hand Part A Ignoring her arm mass, what's her new rotational velocity? Express your answer to two significant figures and include the appropriate units. s, each holding a 5.0 kg mass, are 0.79 m from the rotation axis. Part B Repeat if each arm is modeled as a 0.79 long uniform rod of mass of 4.8 and her total body mass is 60 . Express your answer to two significant figures and include the appropriate units.
The electric field everywhere on the surface of a thin, spherical shell of radius 0.785 m is of magnitude 850 N/C, What is the net charge within the sphere's surface
The specifications for a ceiling fan you have just bought indicate that the total moment of inertia of its blades is 0.13 kg · m2, What is the angular acceleration of the blades
Suppose a collision produces a pair of particles, an electron and a positron (antielectron). the two are both initially traveling at a velocity of 8.0E4i m/s. what is the electric force on the electron? (neglect the electric force due to the positr..
An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 180m/s^2. What is the magnitude of the electric field in (N/C)? What is the direction of the electric field?
A portable electric heater uses 14 Amp of current. What is the smallest radius of copper wire that can be used in the extension cord
A beam of unpolarized light of intensity 33.0 W/m2 passes through a polarizing sheet. What is the electric field amplitude of the transmitted beam?
A hotel elevator ascends 110 {rm m} with a maximum speed of 4 {rm m/s}. Its acceleration and deceleration both have a magnitude of 1.20 {rm m/s^2}.
The temperature at Furnace Creek in Death Valley reached 134°F on July 10, 1913. What is the speed of sound in air
What is the torque on the root of the tooth about point A.
q1. it is 140 cm from your eyes to your toes. youre standing 186 cm in front of a tall mirror. how far is it from your
Consider 0.8 grams of air (which may be assumed to be an ideal gas) at 295 K and 1.5 bar trapped in a rigid tank. An electrical heater is operated for 30 seconds. During this time the voltage across the heater is 12 V and 0.6 amps pass through the..
A refrigerator uses 40.0 J of work to extract 90.0 J from a heat reservoir at 0.00°C. What is the coefficient of performance for the refrigerator
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