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A 2500-kg probe in orbit about the moon is 2.4 m high and has octagonal bases of sides 1.2 m. The coordinate axes shown are the principal centroidal axes of inertia of the probe, and its radii of gyration are kx = 0.98 m, ky = 1.06 m, and kz = 1.02 m. The probe is equipped with a main 500-N thruster E and with four 20-N thrusters A, B, C, and D which can expel fuel in the positive y direction. The probe has an angular velocity ω = (0.040 rad/s)i 1 (0.060 rad/s)k when two of the 20-N thrusters are used to reduce the angular velocity to zero. Determine
(a) which of the thrusters should be used,
(b) the operating time of each of these thrusters,
(c) for how long the main thruster E s hould be activated if the velocity of the mass center of the probe is to remain unchanged.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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