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the leaves of a tree lose water to the atmosphere via the process of transpiration a particular tree loses water at the
an engine absorbs 172 kj from a hot reservoir at 277degc and expels 115 kj to a cold reservoir at 27degc in each cyclea
the initial velocity of a car is vi45kmhr in the positive x-direction the final velocity of the car vf is 66kmhr in a
zinc carbonate hydroxide contains 5955 zinc by mass calculate the molecular weight molar mass of zinc carbonate
green light 546 nm strikes a single slit at normal incidence what width slit will produce a central maximum that is
monochromatic light of wavelength 430 nm is incident on a soap bubble of index 157 what is the wavelength of the light
an unknown compound containing only carbon and hydrogen was burned in excess oxygen when 7714 grams of the compound was
what mass of cu and of n in grams are contained in 2507 g of sample that is 754 pure cuno32 by mass assume that the
an airplane has a mass of 17x106kg and the air flows past the lower surface of the wings at 96 ms if the wings have a
an ideal monatomic gas expands isothermally from 0590 m3 to 125 m3 at a constant temperature of 690 k if the initial
for my project i constructed a trebuche a trebuche is an ancient device used for launching projectiles it acheives this
a heat engine operates in a carnot cycle between 900degc and 360degc it absorbs 20400 j of energy per cycle from the
the density of gold is 1931 gcm3 and the density of platinum is 2143 gcm3 if equal masses of gold and platinum are
write the reaction of the borohydride ion with water using curvy arrows to show electron movement to form one molecule
a tank having a volume of 011 m3 contains helium gas at 170 atm how many balloons can the tank completely fill if each
sodium borohydride reacts slowly with water and even more slowly with ethanol to generate h2 what observation would
in a metal each atom and its core electrons are connected by springs to each of their neighbors this would give a
consider a powder with 995 aucl3 particles and 05 agcl particles and each weighs 10 microg a if one weighed out 40 mg
sound is passing perpendicularly through an open window whose dimensions are 11 m x 075 m the sound intensity level is
a raindrop of mass 335 10 -5 kg falls vertically at constant speed under the influence of gravity and air resistance
a a party store has a tank of helium at a pressure of 68 atm in the store where the temperature is 21degc if an
the hang time of a punt is measured to be 450 s if the ball was kicked at an angle of 63 degrees above the horizontal
the total volume of water in the oceans is approximately 140 multiplied by 109 km3 the density of sea water is 1030
a flask contains 300ml of 012m phosphate buffer that has a ph of 72 what volume of 02m hcl should be added to drop the
in a nuclear power plant the fuel rods last 3 yr before they are replaced if a plant with rated thermal power 100 gw