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Why is it necessary to weigh to constant mass? Nettie's answer: because each element has its own mass and weight so you need to make sure that the solid is completely dry?
If 12mL of a 0.100M calcium chloride solution is diluted to2.00L by the addition of water, and if 2 drops( 0.100mL) of the final solution is used , how many chloride ions are in the sample?
If the box is a distance 1.83 m from the rear of the truck when the truck starts, how much time elapses before the box falls off the truck?
Two 10.0 mL samples of a Patient's Urine were taken. After adding a few drops of HNO3 and adding 5.0 mL ofAgNO3(excess silver) and filtering out the precipitateof AgCl. They obtained weights of 0
A student determined that the urine sample they were analyzing hada chloride concentration of 0.083 g/L (in a 10mL solution ofAgCl). What is the concentration in parts per million(PPM)?
A charge of 3.45 µC is uniformly distributed on a ring of radius 9.0 cm. Find the electric field strength on the axis at the following locations.
How much force must be applied tangentially at the end of a crank handle 0.500 m long to bring the stone from rest to 120 rev/min in 7.00 s?
Cerebellum, explain in brief why is the cerebellum is more developed in mammals that jump or fly? what is cell?
Two equal masses are connected by a light cord passing over a pulley of negligible mass. at the moment the system is in motion, with the right hand block moving downward at 1.2 m/s. what is the corr
A particle of mass m is released from a point between the two masses 20.0 cm from the 9.00 kg mass along the line connecting the two fixed masses. a) Find the magnitude of the acceleration of the pa
The heat of combustion for the sample of coal is 23kj/g. What quantity of coal (in grams) must be burned to heat 500 grams of water from 20 degrees celsius to 95 degrees celsius to 95 degrees celsiu
The density is 11.3 X 10^3 kg/m^3, and the density of water is 1.00 x 10 ^3 kg/m^3. Find the buoyant force on the wood and lead, and the mass of the lead.
Six parallel-plate capacitors of identical plate separation have different plate areas A, different capacitances C, and different dielectrics filling the space between the plates. Below is a generic
The diameter of the circle in which the discus moves is about 2.26 m. If the thrower takes 1.32 s to complete one revolution, starting from rest, what will be the speed of the discus at release?
A child pulls a wagon with a force of 10 N by a handle making an angle of 19 degrees with the horizontal. If the wagon has a mass of 5.7 kg, to the nearest hundredth of a m/s2 what is the accelerati
The capacitor in an RC circuit (R = 180 O, C = 69 µF) is initially uncharged. Find the charge on the capacitor and the current in the circuit one time constant (t = RC) after the circuit is co
An electron has an initial velocity of 9.00 x 106 m/s in the x direction. It enters a uniform electric field = (400 N/C), which is in the y direction. (a) Find the acceleration of the electron. answer
How many moles of air must escape from a 10m x 8.0m x 5.0m room when the temperature is raised from 0c to 20c? Assume the pressure remains unchanged at one atmosphere while the room is heated.
How many grams of ethylene glycol, C2H4(OH)2, must be dissolved in 2000.0grams of water to lower the preezing point to -29.75 deg C? If the density of ethylene glycol is 1.12 g/mL, how many millilit
An 11W energy-efficient florescent lamp is designed to produce the same illumination as a conventional 80W lamp. How much does this energy-efficient lamp save during 89h of use? Assume a cost of $0.
The wire in a house circuit is rated at 22.8A and has a resistance of .24ohms. What is its power rating in W? and how much heat does the wire give off in 19.3 min in J?
Coal reserves in the united states are estimated to contain 4.00 x 10^16 moles of carbon. if the efficiency is 40%, how much gross energy can this reserve produce through the traditional process of
The rate constants of some reactions double with every 10 degreerise in temperature. Assume that a reaction takes place at 291 Kand 301 K. What must the activation energy be for the rate constant to
What height will the ball reach after the first bounce if it is instead thrown vertically downward from the same height at 5m/s?
Hydrides have been proposed as a means ofstoring hydrogen gas for fuel in solid form (the reactions thatform them are generally reversible). Take, for example magnesium hydride, MgH2.