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While running, a person dissipates about 0.593 J of mechanical energy per step per kilogram of body mass. If a 62.6 kg runner dissipates a power of 60.9 W during a race, how fast is the person runn
If we begin with an initial SO2Cl2 pressure of 450 torr, what is pressure of substance after 60? At what time will the pressure of SO2CL2 decline to one-tenth its initial value?
How much heat is absorbed by a persons hand if 100 grams of steam at 100°C is first converted to liquid water at 100°C and then cooled to normal body temperature?
A metal-plating waste contains 20mg/L Cu2+, and it is desired to add Ca(OH)2 to precipitate all but 0.5mg/L of the copper. To what concentration in moles per liter must the hydroxide concentration b
A 430 g football is lying on the ground, then is kicked and is moving at 25 m/s. If the duration of the impact was 0.0010 s, what was the average force on the ball?
During the spin-dry cycle of a washing machine, the motor slows from 80 rad/s to 40rad/s while the turning the drum through an angle of 120 radians. What is the magnitude of the angular acceleration
At a certain temperature and pressure 0.70 L of H2 reacts with 0.70 L of I2. If all the H2 and I2 are consumed, what volume of HI, at the same temperature and pressure, will be produced?
A space vehicle is traveling at 4000 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 88 km/h relative to the command module. The mass of t
If hexane is mixed with water, there is a separation of the two solvents into two layers. Why did this separation occur? which solvent would be on top?
Gold metal can be reduced from the compound gold sulfide by hydrogen gas. How many grams of Au can be produced from 500.20g of Au2S3 and 5.67g H2?
How many carbon dioxide in kilograms is produced upon the complete combustion of 18.9 L of propane (approximate contents of one 5-gal tank)? Assume that the density of the liquid propane in the tank
A piece of metal wieghs 50.0 N in air, 36.0 N in water, and 41.0 N in an unknown liquid. Find the densities of the matal and the unknown liquid
A 200 kg weather rocket is loaded with 100 {rm kg} of fuel and fired straight up. It accelerates upward at 31 m/s^2 for 33 s, then runs out of fuel. Ignore any air resistance effects. How long is th
Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
500.0 gram sample of aluminum is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in °C?
A sample of 0.6760 g of an unknown compound containing barium ions (Ba2+) is dissolved in water and treated in excess Na2SO4. If the mass of BaSO4 precipitate that forms is 0.4105 g. What is the per
The battery has internal resistance of 0.100 Ω, and the rod and rails have negligible resistance. A 2.02 T magnetic field is directed perpendicular to the plane of the circuit. (a) Find the ma
How many hydrogen sulfide molecules would be required to reach the lethal dose in a room that is 77 feet long, 62 feet wide and 50. feet tall at 1.0 atm and 25.0 oC?
A flywheel with a very low friction bearing takes 1.9 h to stop after the motor power is turned off. The flywheel was originally rotating at 34 rpm. What was the initial rotation rate in radians per
A tennis player receives a volley with the ball (0.0600 kg) traveling horizontally at 51.0 m/s and returns the ball so that it travels horizontally at 42.0 m/s in the opposite direction. What is th
The equivalence point is reached when 28.38 of solution is added. What is the concentration of the unknown solution?
When they are relaeased from rest will they start to move? If so determine their acceleraton and the tension in the string. If not determine the sum of the magnitudes of the forces of friction actin
A hot iron horseshoe (mass=0.40 kg), just forged is dropped into 1.35 L of water in a 0.30-kg iron pot initially at 20 degree celsius. If the final equilibrium temperature is 25.0 degree cesius, es
If 122mL mL of a 1.0M M glucose solution is diluted to 550.0mL mL , what is the molarity of the diluted solution?