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Find the net downward force on the tank's flat bottom, of area 1.60 m^2, exerted by the water and air inside the tank and the air outside the tank.
How much bacterial tissue is produced in a treatment plant for every 1.0 x 10^4 of wastewater containing 3.0% NH4+ ions by mass?
What is the rms speed of nitrogen molecules contained in an 9.0-{rm m}^3 volume at 2.9 atm if the total amount of nitrogen is 2000 mol?
If a bird were to start out from the origin (where the student starts) and fly directly (in a straight line) to the school, what distance would the bird cover?
A proton orbits a long uniformly charged wire along a circular path. It makes 1.0 million revolutions per second. The radius of the orbit is 1.0 cm. What is the wire's linear charge density?
0.351 g sample of a nonvolatile, yellow crystalline solid dissolves in 15.8 g of benzene, producing a solution that freezes at 4.77 oC. Find the molar mass of the yellow solid. The following may be
A spot of paint on a bicycle tire moves in a circular path of radius 0.33 {rm m}. When the spot has traveled a linear distance of 1.70 m, through what angle has the tire rotated? Give your answer in
When a 6.00-g sample of KCN is dissolved in water in a calorimeter that has a total heat capacity of 2.156 kJ·K-1, the temperature decreases by 0.500 K. Calculate the molar heat of solution
A block of wood is either oak or pine. Its dry weight is 19.8 lbs and it will displace a volume of 2.7 gallons of water. Is the wood oak or pine? The density of oak is 0.9 g/cm3 and the density of p
Calculate the volume of a spherical balloon which has a surface area of 0.0681 m2
When 24.4 mL of 0.500M H2SO4 is added to 24.4ml of 1.00M KOH in a coffee cup calorimeter at 23.5 degrees Celcius, the temperature rises to 30.17 degrees celcius. Calculate delta H of this reaction
A force of 2N is used to propel a toy car across the ramp at a constant velocity of 20cm/sec. What is the force of friction the car experiences with the ramp
An archer shoots an arrow horizontally at a target 15 m away. The arrow is aimed directly at the center of the target, but it hits 60 cm lower. What was the initial speed of the arrow? (Neglect air
A convex lens is held over a piece of paper outdoors on a sunny day. When the paper is held 20 cm below the lens, the sunlight is focused on the paper and the paper ignites. What is the focal lengt
A man pulls a crate of mass 71.0 kg across a level floor. He pulls with a force of 178.0 N at an angle of 27.0° above the horizontal. When the crate is moving, the frictional force between the f
How much PV work is done (in kilojoules), if 88.0 g of ethylene and 120 g of HCl are allowed to react at atmospheric pressure and the volume change is -70.3 L?
1.64g of a mixture of CaCO3 and MgCO3 was dissolved in 50ml of 0.8 M HCL. the excess of acid required 16ml of 0.25M NaOH for neutralization. Calculate the percentage of CaCO3 and MgCO3 .
A 12.4 g bullet is fired horizontally into a 96 g wooden block initially at rest on a horizontal surface. After impact, the block slides 7.5 m before coming to rest. If the coefficient of kinetic f
A rocket is launched at an angle of 50.0° above the horizontal with an initial speed of 105 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 31.0 m/s2.
A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm. What is the partial pressure of argon in the flask?
A clock pendulum oscillates at a frequency of 2.5 Hz. At it is released from rest starting at an angle of 15º to the vertical. Ignoring friction, what will be the position (angle) of the pendul
A sample of a compound containing only chlorine and oxygen reacts with an excess of hydrogen gas to give 0.278 g HCl and 0.206 g water.
A solution contains Cr3+ ion and Mg2+ ion. The total mass of the precipitate is 49.6. Find the mass of Cr3+ in the original solution.
Bonnie and Clyde are sliding 300 {rm kg} bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with 420 {rm N} of force while Bonnie pull
An archer pulls her bowstring back 0.400 m by exerting a force that increases uniformly from zero to 200 N. a) What is the equivalent spring constant of the bow?