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A student sitting on a frictionless rotating stool has rotational inertia 0.91kg?m2 about a vertical axis through her center of mass when her arms are tight to her chest. The stool rotates at 7.25rad/s and has negligible mass. The student extends her arms until her hands, each holding a 4.7kg mass, are 0.73m from the rotation axis.
a.) Ignoring her arm mass, what's her new rotational velocity?
b.) Repeat if each arm is modeled as a 0.73m long uniform rod of mass of 4.8kg and her total body mass is 59kg .
One mole of an ideal gas initially at a temperature of Ti = 6.8°C undergoes an expansion at a constant pressure of 1.00 atm to seven times its original volume. Calculate the new temperature Tf of the gas
Suppose that you are traveling on board a spacecraft that is moving with respect to the earth at a speed of 0.935c. what is your breathing rate
A bicycle racer is traveling at 10 m/s with an acceleration of 0.5 m/s^2. The radius of the bicycle wheel is 33 cm. What is the angular velocity of the bicycle wheels
A spherical water drop 2.6 ?m in diameter is suspended in calm air due to a downward-directed atmospheric electric field of magnitude E = 3800 N/C. How many excess electrons does it have
In a period of 1 s, 4.00 x10^23 nitrogen molecules strike a wall with an area of 6.30 cm2. If the molecules move with a speed of 300 m/s and strike wall head-on in elastic impacts, what is the pressure exerted on the wall? (The mass of one N2 mole..
The three charged particles in the figure below are at the vertices of an isosceles triangle (where d = 3.80 cm). calculate the electric potential at point A, the midpoint of the base
Young's Double Slit Experiment is performed with 589 nm light and a distance of 2.00 m between the slits and the screen. The fifth interference minimum is observed 7.50 mm from the central maximum. Resolve the spacing of the slits.
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff
Consider n moles of an ideal monatomic gas placed in a vertical cylinder. The top of the cylinder is closed by a piston of mass M and cross-section A. Initially the piston is fixed, and the gas has temperature T0 and volume V0.
Two point charges Q1 = +4.50 nC and Q2 = ?2.20 nC are separated by 45.0 cm. What is the potential energy of the pair of charges
A car was seen driving off the edge of a cliff at an angle of 10 ° above the horizontal. The cliff is 95m high and the car impacted the ground at a distance of 156m from the base of the cliff. What is the speed of the car.
A vertical straight wire carrying an upward26-A current exerts an attractive force per unit length of 7.3×10?4N/m, What is the direction of the current in the second wire?
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