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Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling is of height 3.5 m, and the balloons are launched at a velocity of 10
An ocean liner leaves New York City and travels 43.0° north of east for 189 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship
Two strips of metal each weighing 100g are placed into a cylinder containing water. The volume of water displaced is 8.8mL in one case and 37.0mL in the other case. Identify the two metal stri
A 2.60 multiplied by 102 g sample of water at 80.0°C is mixed with 2.60 multiplied by 102 g of water at 25.0°C. Assume no heat loss to the surroundings. What is the final temperature of the
At equilibrium a 4.00 L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. How many moles of CO2 must be added to the system to bring the equilibrium CO concentration to
A child goes down a playground slide with an acceleration of 1.34 m/s2. Calculate the` if the slide is inclined at an angle of 34.0° below the horizontal.
A listener is 57 m from the left speaker and 30 m from the right one. The listener can respond to all frequencies from 20 to 20 000 Hz, and the speed of sound is 343 m/s. What are the two lowest fre
How much work is done in kilojoules for the reaction of 5.60 of acetylene at atmospheric pressure if the volume change is -2.41 ?
What is the magnitude of the net force exerted by these two charges on a third charge q3 = 7.00 {rm nC} located at y3 = 0.400 {rm m}?
An athlete at the gym holds a 3.2 kg steel ball in his hand. His arm is 76 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm in each of the
Compute the voltage, at 25 °C, of an electrochemical cell comprised of pure cadmium immersed in a 2 x 10-3 M solution of Cd2+ ions.
A 40%-efficient electric power plant produces 900 of electric power and discharges waste heat into 20C ocean water. Suppose the waste heat could be used to heat homes during the winter instead of b
The drawing shows an A-shaped stepladder. Both sides of the ladder are equal in length. This ladder is standing on a frictionless horizontal surface, and only the crossbar (which has a negligible m
A calorimeter contains 27.0 mL of water at 13.5 degrees C. Calculate the enthalpy change, ^H , for this reaction per mole of X .
How long, in seconds, does it take an automobile traveling 65.0 km/h to become even with a car that is traveling in another lane at 40.0 km/h if the cars' front bumpers are initially 114 m apart?
Assuming that the container is completely full, that the temperature is 26.6°C, and that the atmospheric pressure is 1.0atm , calculate the percent (by volume) of air that would be displaced if all
A ski starts from rest and slides down a 24{rm ^circ} incline 75 {rm m} long. If the coefficient of friction is 0.095, what is the ski's speed at the base of the incline?
A rock of mass 34 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 248 N. What is the magnitude
What is the magnitude of the apparent weight of a 79 kg astronaut 5100 km from the center of the Earth's Moon in a space vehicle moving at constant velocity?
Calculate how many cm^3 of a solution of sulfuric acid 80.0% (density = 1.727 g/mL) must be diluted with water in order to prepare a solution of 0.2 L 0.4 M. What's the pH of this solution if we add
A solution is made by mixing 89 g of n-propyl choride (C3H7Cl) and 79 g of n-propyl bromide (C3H7Br). Assume the solution is ideal. What is the total vapor pressure of the solution at 25C?
When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 360 N to hold it there. We pull the block to x = 13.0 cm and then release it. How much work does the spring do on the
A baseball is thrown at an angle of 24? relative to the ground at a speed of 25.2 m/s. The ball is caught 48.1067 m from the thrower. The acceleration due to gravity is 9.81 m/s2 . How long is it in
Chlorine gas can be produced commercially by passing an electric current through a concentrated solution of sodium chloride (brine). How much H2 can be produced?
if the molality of a NaBr(aq) solution is 2.50 m what is the weight percent of NaBr? the molar mass of NaBr is 102.9 g/mol