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You are in the neighborhood of a star (radius of 700,000 kilometers) which has emitted so many protons ("solar wind") during its life, that it now possesses a huge net negative charge of 6 x 10^6 C (surface charge). You did not know the fact and launched a probe (100 kilograms) on an orbit around the star (circular orbit, with a radius of 100 million kilometers). Your probe is protected against heat, but not against being polarized by influence. For short, your probe has an extra (positive) charge of 1000 C. The new attraction force was not foreseen previously, and you must compensate it somehow, because otherwise the probe will fall into the star.One proposition is to use temporarily the engines of the probe against the star attraction, until you find a permanent solution.
A) What power must the engines of the probe use in order to maintain the orbit?
Two wires are parallel and one is directly above the other. Each has a length of 50.0 m and a mass per unit length of 0.020 kg/m. However, the tension in the wire A is 6.20 102 N, and the tension in the wire B is 2.90 102 N.
A seagull flies at a velocity of 10.00 m/s straight into the wind, If it takes the bird 18.0 min to travel 6.00 km relative to the earth
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -13.10 eV. What is the energy of the first photon emitted
A cylindrical capacitor consists of a cylinder (of length L and radius a) with a total charge Q nested inside a thin conducting cylindrical shell (of length L and radius b) with total charge -Q
the other car pulls with a force of 872 N at an angle of 24? with respect to the same direction. Illustrate what is the net forward force exerted on the truck in the direction it is headed?
A plane has an airspeed of 142m/s. A 16.0m/s wind is blowing soutward at the same time as te plane is flying. what is the magnitude of that velocity
Alberta is going to have dinner at her grandmother's house, but she is running a bit behind schedule. What is the slowest speed at which she could drive
A kid fires water horizontally from a squirt gun held 1.6 above the ground. It hits other kid 2.4 away squares in the back, at a point 0.85 above the ground. What was the initial speed of the water.
Three single-phase step-up transformers rated at 10MVA, 4.6kV/13.8kV are connected in Wye-Delta configuration. The three transformers are used to feed a 20MVA load at 0.9 p.f. With an efficiency of 96%. Find the secondary line voltage.
A heat that goes into a particular carnot engine is 4.72 times greater than the work it performs. What is the engines efficiency
Calculate the speed of a proton with a kinetic energy of 1.48 eV, Find the speed of an electron that has a kinetic energy of 1.48 eV. 1 eV = 1.602 × 10^?19 J
A farsighted man uses eyeglasses with a refractive power of 2.10 diopters. Wearing the glasses 0.03 m from his eyes, What is the correct contact lens prescription
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