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A model rocket engine has an average thrust of 5.26 N. It has an initial mass of 25.9 g, which includes fuel mass of 13.4 g. The duration of its burn is 1.90 s. (Assume all the fuel is consumed.)
(a) What is the average exhaust speed of the engine?
m/s
(b) This engine is placed in a rocket body of mass 42.5 g. What is the magnitude of the final velocity of the rocket if it were to be fired from rest in outer space by an astronaut on a spacewalk? Assume the fuel burns at a constant rate.
Two thermally insulated reservoirs each contain 2 kg of water at temperatures of 80 °C and 20 °C respectively, Determine the find equilibrium temperature and find the change in entropy of the local universe in the mixing process
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An extremely thin film of soapy water (n=1.36) sits on top of a flat glass plate with n=1.11. What is the thickness of the film
What fraction of the power radiated by the sun is intercepted by the planet Mercury? The radius of Mercury is 2.44 x 106 m, and its distance from the sun at the moment is 5.75 x 1010 m. presume that sun radiates uniformly in all directions.
A 4.25 bullet traveling horizontally with a velocity of magnitude 375 is fired into a wooden block with mass 1.10 , initially at rest on a level frictionless surface. The bullet passes by the block and emerges with its speed reduced to 110 .
A light ray initially in water enters a transparent substance at an angle of incidence of 39.0°, Calculate the speed of light in the transparent substance
The mean distance between the Earth and the Sun is 1.50×1011 m. The average intensity of solar radiation incident on the upper atmosphere of the Earth is 1390 W/m2, determine the total power radiated by the Sun
A scuba diver and her gear displace a volume of 70.0L and have a total mass of 73.1kg. What is the buoyant force on the diver in sea water
Two positive point charges, each 12\mu C , lie along the x-axis at x = -0.10m and x = +0.10m. Find the electric field at the point (0, 0.25m ) on the y-axis
Assume the Earth is in uniform cicular motion about the sun. Explain how to determine the angular velocity of the Earth
During a stage production of Peter Pan, the 53.5 kg actress playing Peter has to fly in vertically (descend). Calculate the tension in the wire supporting the actor
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