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the highest recorded waterfall in the world is found at angel falls in venezuela its longest single waterfall has a
it is desired to cool iron parts from 500degf to 100degf by dropping them into water that is initially at 55degf
a 250 - resistor is connected in series with a 480 - fcapacitor the voltage across the capacitor is vc760vsin120rads t
a 150- resistor is connected in series with a 0250-h inductor the voltage across the resistor is vr380vcos720radsta
the observer on the right sees two final images one image comes directly from the objet the other images comes from the
an engine transfers 25 x 103 j of energy from a hot reservoir during a cycle and has an efficiency of 03a how much heat
during one cycle a heat engine transfers 4 x 103 j of heat from a hot reservoir and exhausts 24 x 103 j to a cold
when n moles of an ideal gas is allowed to expand from an initial volume of 10 m3 at a constant temperature t the work
the pressure of an ideal gas remains at 200 pa while 1000 joules of heat are removed and its internal energy increases
two moles of an ideal gas at 200 k occupies a 40 m3 containera what is the pressure of the gasb what would the pressure
1 a simple ideal rankine cycle which uses water as the working fluid operates its condenser at 45 degrees c as
1 calculate the change in specific entropy of air as it is expanded from 2500kpa and 550 degrees c to 120kpa and 65
the work function for potassium is 225ev a beam with a wavelength of 400nm and an intensity of 10-9wm2 finda the
an object at rest on a flat horizontal surface explodes into two fragments one seven times as massive as the other the
the center fielder for the schools baseball team throws a 0150-kg baseball towards home plate at a speed of 260 ms and
a 300 kg dragster accelerates from rest to a final speed of 110 ms in 400 m about a quarter of a mile and encounters an
a 44-m-diameter merry-go-round is initially turning with a 45s period it slows down and stops in 16sa before slowing
a childs water pistol shoots water through a 10mm -diameter hole if the pistol is fired horizontally 65cm above the
an atwood machine consists of two blocks m1 15 kg and m2 23 kg connected by a masslessstring that passes over a pulley
a 190 m tall hollow aluminum flagpole is equivalent in strength to a solid cylinder of aluminum 450 cm in diameter a
mary applies a force of 79n to push a box with an acceleration of 056 ms when she increases the pushing force to 90 n
calculate the force a piano tuner applies to stretch a steel piano wire 810 mm if the wire is originally 0850 mm in
an object 25 cm tall is placed 232 cm from the front of a concave mirror with a radius of curvature of 331 cma where is
when a spacecraft travels from earth to the moon the gravitational force from earth initially opposes this journey