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A circuit is constructed with six identical resistors and an ideal battery. When R4 is removed from the circuit the current in the battery decreases by 1.9A. Determine the resistance of each resisto
What does it mean to say that the ions of an electrolyte behave independantly of one another when the electrolyte is dissolved in water?
The stirrer is used to stir the mixture gently until it reaches its final equilibrium temperature of 32°C. Calculate the mass of the aluminum cup.
A uniform magnetic field of magnitude 0.29 T makes an angle of 13 degrees with the plane of a circular loop of wire. The loop has a radius of 1.85 cm. What is the magnetic flux through the loop?
Jupiter is an average distance of 7.78 multiplied by 108 km from the Sun. Estimate the length of the Jovian year given that the Earth is 1.50 multiplied by 108 km from the Sun on the average.
When acetylene C2H2 is burned with oxygen,carbon dioxide and steam are formed. A sample of acetylene with a volume of 7.50 L and a pressure of 1.00 atm is burned in excess oxygen at 225oC.
If the command module was at an altitude of about 98 km above the surface of the moon, how long did it take to go around the Moon once?
At temperatures near 800oC, steam passed over hot coke(a form of carbon obtained from coal) reacts to form CO andH2: C(s) + H2O(g) D CO(g) + H2(g).
Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 575 km above the Earth's surface
In one hand you hold a 0.13-kg apple, in the other hand a 0.23-kg orange. The apple and orange are separated by 1.25 m. What is the magnitude of the force of gravity in the following situations?
60mL of a buffer is made up by mixing 38.2mL of 0.100 Macetic acid and 21.8mL of 0.100 M sodium acetate. The buffer has apH of 4.5. Calculate the concentration [HA] in this buffer.
Determine the tangential acceleration of the car when it is halfway through the turn (i.e. 1/4 of a circle), assuming constant tangential acceleration.
Heavy metal azides,which are salts of hydrazoic acid, HN3, are used as explosive detonators. A solution of 0.20 M hydrazoic acid has a pH of 3.21.
Calculate and prepare the necessary volume of 0.1 M NaOH that will be sufficient for all the solutions. Using NaOH pellets, prepare a 100 μg/ml (ppm) vanillin stock solution in 0.1 M NaOH using a
The pH of a 0.75 M aqueous solution of a weak base, B, at 298 K is12.4. What percent of the base has reacted? i.e. what is the percent ionization of this base?
Calculate the amount of cupric nitrate tihydrate (molar massof 241.60 gram/mole) required to prepare each standard listedbelow. Note: The standards are to be prepared in terms of Cu.Remember that co
The coefficient of kinetic friction between the two blocks is 0.300, and the surface on which the 8.00 kg block rests is frictionless. A constant horizontal force of magnitude F=10.0 N is applied to
Formic acid has molar mass of 46.03 g/mol and is composed of 26.1%C, 4.38% H and 69.52% O by mass. What is the molecular formula for this substance (list elements in the formula in the same order as
The atmospheric sulfur dioxide (SO2) concentration over a certain region is 0.12 ppm by volume. Calculate the pH of the rainwater due to this pollutant. Assume that the dissolution of SO2 does not a
find the apparent weight of a 54-kg person in the roller coaster as it passes over the top of the hill. The apparent weight is how heavy the person feels, which is determined in this case by the nor
A girl stands on a rotating merry-go-round, 2.3 m from its center. If the girl has a speed of 2.2 m/s, what is the minimum coefficient of static friction between her feet and the merry-go-round that
(a) What is the angular speed (the magnitude of the angular velocity) of this bacterial motor? (b) How long does it take the motor to make one revolution?
A 0.30 kg toy is attached to the end of a horizontal string and rotated in a circle of radius 1.6 m on a frictionless horizontal surface. If the string will break when the tension in it exceeds 56 N
4.38-g sample of bromine was reacted with oxygen to form anoxide with a mass of 10.0 g. Calculate the percent composition of the compound
(a) What is the initial angular velocity of the turbine? (b) How much time elapses while the turbine is speeding up?