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A zero-momentum spinner has a momentum wheel spinning at 5000 rpm. The angular momentum of the wheel is 100 N-m-s.
a) What is the spin rate of the spacecraft if its moment of inertia, Is = 500 kg-m2?
b) What is the moment of inertia of the wheel?
c) If the wheel suddenly stops, what would the spin rate of the satellite be?
d) Assuming the wheel was fixed, how long would it take to get the wheel back up to a speed of 4000 rpm applying a motor torque of 0.1 N-m?
e) What would the new spin rate of the spacecraft be?
A glass rod is initially neutral. It is then rubbed against a silk cloth. Afterwards, the rod has a charge of +5.0 C, How many electrons did the glass rod lose or gain
A transformer with 120. turns in its secondary supplies 12. volts at 220. ma to a toy train. The primary is connected across a 120. V wall outlet. What power is delivered by the wall outlet
Imagine a solar electric power plant that operates by using a gigantic mirror to concentrate light on the boiler for a steam engine. What is the maximum electric power
Assume that electron-hole pairs are injected into n-type GaAs (Eg = 1.42 eV, mc = O.O7m0, mv= 0.5m0,) at a rate R = 1O^23 per cm3 per second. The thermal equilibrium concentration of electrons is n0 = 10^16 cm^3. If the recombination coefficient r..
An unstretched elastic spring has a mass M = 3.75 kg and a length of l0 = 0.525 m. What is the elastic potential energy of the spring
Consider a simple model for the interior of the Earth: there is a spherical iron core with constant mass density ?0 and radius a; outside the core is "rock" with constant density ?1. Use these values for the densities: ?0= 8.70×103 kg/m^3 and ?1= ..
The largest wavelength of light that will induce a photoelectric effect in potassium is 564nm. What is the kenetic energy of the ejected electron
In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots, Find the direction of the balloon's inital velocity
A real object is placed at the zero end of a meterstick. A large concave mirror at the 100 cm end of the meterstick forms an image of the object at the 70.0cm position. A small convex mirror placed at the 20 cm position forms a final image at the ..
A skier (m=55.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 6.90 m and D = 10.4 m, determine H.
King Arthur's knights use a catapult to launch a rock from their vantage point on top of the castle wall, How far from the castle wall does the launched rock hit the ground
A parallel-plate capacitor has plates of area 3.64×104 m2. What plate separation is required
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