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About 100 years or so ago, some critics claimed that rocket propulsion in outer space would never work "because in outer space there is no air for the rocket to push off against". Well, as we now know, rocket propulsion in outer space does work, and those critics were completely wrong! But why? Explain clearly.
When the string is 1.047 m long and the speed of the rock is 45.1 m/s, the string breaks. What is the breaking strength of the string.
A 8.68x10^5-m- long pipeline has an inside diameter of 12 in. and can be supplied with oil at 35L/s (a) what is the volume of oil in the pipeline if it is full at some instant in time? (b) How long would it take to fill the pipleline with oil if it i..
The crankshaft in a race car goes from rest to 3360rpm in 2.0s . What is the crankshaft's angular acceleration
question1a 25mw jet engine produces a sound level of 120db threshold of pain at a distance of 100m from the engine
suppose that they have same internal energy, which will have a higher temperature: a metal knife in thermal equilibrim with a hot griddle or a 1kg block of ice at -25C or seven 12g ice cubes at -25C.
A rock weighing 7404 N rock with a volume of 29 L is completely submerged in mercury. The density of mercury is 13.6 kg/L. Decide the density of the rock. Decide the buoyant force on the rock.
The plate on the back of a certain computer scanner says that the unit draws 0.30 Amp of current from a 120 Volt, 60 Hertz line. Evaluate what the average current
The Following system is at equilibrium. Find the water pressure term (h or p) of the total soil water potential at point A and point B. You may express your response in either energy/volume or energy/weight of water
From wind tunnel tests under the same flow conditions , the average frictional shear stress on the upper surface is determined to be 0.0625N/m^2. What is the allowable power dissipation from the upper surface of the board if the average surface te..
What is the magnitude of the electric field. A 50-gram super ball traveling at 25m/s is bounced off a brick wall and rebounds at 22 m/s. A high speed camera records this event. If the ball is in contact with wall for 3.5 ms, what is the average acc..
A baseball has a mass of 0.140 kg, and it is pitched towards home plate at a speed of 54.0 m/s. what is the final speed of the ball
two parallel sheets of aluminum foil separated by 0.1 mm are connected to a 9-v battery. the area of each sheet is 0.5
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