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It is currently popular for automobiles to use 10% ethanol / 90%gasoline mixtures (‘gasohol’) as fuel. According topopular consensus the main benefit of gasohol use is that it“reduces our dependence upon foreign oil.” Test thisassertion by making some elementary calculations. Our analysis willunrealistically ignore engine maintenance issues associated witholder automobiles (such as gasket and seal hardening), the addedfuel consumption necessary to produce grain used as a feedstock inethanol production, the incremental food price increases associatedwith a reduction in grain stocks, and many other important effects.Gasohol use typically reduces average fuel economy by approximately15% and effectively leaves fuel prices unchanged.Determine the ‘break-even’ fuel economy ratio – that is, find the ratio of the gasoline to gasohol fuel economy for two vehicles to use the same amount of pure gasoline when driven the same distance?
Conservation of energy tells us that energy cannot be created or destroyed. Clearly, energy is required for radioactivity to occur. Where is this energy coming from?
Three children each of weight 356N make a long raft by lashing together logs of diameter 0.30m and length 1.8m. how many logs will be needed to keep them afloat in fresh water. take density of the logs to be 800kg/m^3.
An FM radio station of frequency 96.7 MHz puts out a signal of 29900 W. How many photons per unit time are emitted
A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 3.6 J of work is required to compress the spring by 0.1 m. Find the value of the mass
A rifle with a barrel length of 59 cm fires a 8 g bullet with a horizontal speed of 350 m/s, What resistive force (assumed to be constant) does the wood exert on the bullet
A wrench is placed at 30 cm in front of a diverging lens with a focal length of magnitude 10 cm. What is the magnification of the wrench
A solid block of mass m2 = 0.5 , at rest on a horizontal frictionless surface, is linked to a relaxed spring (with spring constant k = 150 whose other end is fixed. Another solid block of mass m1 = 2.4 and speed v1 = 2.2 collides with the 0.50 blo..
it takes 7500 J of work to slide a crate a distance of 15 m across a floor. A force of 650 N was applied to the rope. what angle did the rope make with the ground
question1find out the tension in each of the two ropes supporting a hammock if one is at an angle of 14 above
A proton having an initial velocity of 17.2i hat bold Mm/s enters a uniform magnetic field of magnitude 0.360 T with a direction perpendicular to the proton's velocity. Determine the time interval for which the proton is in the field
In the system shown in the figure, suppose the block has a mass of 3.3 , the spring has a force constant of 450 , and the coefficient of kinetic friction between the block and the floor is 0.19. Find the work done on the block by the spring
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 13.0 g. The duration of its burn is 1.90 s. find What is the average exhaust speed of the engine
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