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A team of astronauts is on a mission to land on and explore a large asteroid. In addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. With what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? Assume that the asteroid is approximately spherical, with an average density ρ = 3.19 × 106 g/m3 and volume V = 1.02 × 1012 m3. Recall that the universal gravitational constant is G = 6.67 × 10-11 N·m2/kg2.
Discuss briefly the origin of the differing electronic properties of metals, semiconductors and insulators. Under what circumstances will the nearly-free electron model be useful for describing the band structure of a solid?
Consider the group of three +2.8 nC point charges shown in the figure. What is the electric potential energy of this system of charges relative to infinity?
What mass of stone is necessary if the temperature is not to drop below 18.5°C overnight. Sunlight shining in during the daytime is absorbed by the floor, interior walls, and objects in the room, raising their temperature to 37.5°C.
An object weighs 3300 N. What is the object's mass? An object weighs 3000 lb. What is the object's weight in N? An object weighs 2700 N. What is the object's weight in lb? The mass of a certain elephant is 4,067 kg. (a) Find the elephant's weight in ..
when a parachute opens the air exerts a large drag force on it. this upward force is initially greater than the weight
The drawing shows four point charges. The valueof q is 3.0 μC, and thedistance d is 0.63 m. Find the total potentialat the location P. Assume that the potential of apoint charge is zero at infinity.
Three equal positive point charges of magnitude Q = 7.00mu C are located at three corners of a square of edge length d = 5.6 cm. What is the magnitude of the attractive force on the negative charge
A charge of 80nC is uniformly distributed along the x axis from x = 0 to x = 2.0 m. Determine the magnitude of the electric field at a point on the x axis with x= 8.0m
You have 34 tuning forks that oscillate at close but different frequencies. What are the (a) maximumand (b) minimum number of different beat frequencies you can produce by sounding the forks 2 at a time,depending on how the frequencies differ?
A plastic light pipe has an index of refraction of 1.42. For total internal reflection, what is the minimum angle of incidence if the pipe is in the following media
Find the rms speed of the molecules of a sample of N2 (diatomic nitrogen) gas at a temperature of 38.9°C
A 4800kg truck is parked on a 14 degree slope. The coefficient of static friction between the tires and the road is 0.90. How big is the friction force on the truck
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