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The police officer, knowing that the coefficient of kinetic friction between the tires and the road is 0.4, calculates the speed of the Toyota at impact. What was that speed?"
A solution of potassium hydroxide of unknown concentration is used to titrate 15.0 mL of a 2.5 M sulfuric acid solution. The volume of the base needed is 27.2 mL. What is the molarity of the base?
a sample of helium gas is at 122 kpa and 22 C. assuming constant volume, what will the temperature be when the pressure is 203 kpa .
A 5 Kg block is on a 9 Kg triangular wedge. All surfaces are frictionless and both object start from rest. The block starts at the top of the wedge at 1.2 m. Find the final speeds of a block and the
Why does the magnetic field need to be changing? Why can't a very strong but constant magnetic field charge the capacitor?
The pH of a solution made by dissolving 1.0 mole of propanoic acid and 1.0 mol of sodium propanoate in 1.0 L water is 4.85.
A hot air balloon has a mass of 3400kg and two 75kg passengers. It is currrently decending at 4m/s. Draw a free body diagram for the hot air balloon. When the burner is turned on what force is requi
The first-order bright fringe is a distance of 4.84 from the center of the central bright fringe. For what wavelength of light will the first-order dark fringe be observed at this same point on the
While a person is walking, his arms (with typical lengths 70cm measured from the shoulder joint) swing through approximately a 45deg angle in 0.5sec. As a reasonable approximation, we can assume tha
Determine the molar mass of an unknown gas that has a volume of 72.5 mL at a temperature of 68°C, a pressure of 0.980 atm, and a mass of 0.207 g.
What is the speed of a wave in a particular medium that has a frequency of 445 MHz and a wavelength of 67 cm?
Seven-and-a-half seconds later the astronaut comes into contact with the shuttle. What was the initial distance from the shuttle to the astronaut?
Suppose a red blood cell is examined with a compound microscope in which the objective and eyepiece are separated by a distance of 11.0 cm. Given that the focal length of the eyepiece is 2.51 cm, an
A bullet of mass 10 g is fired with an initial speed of 296 m/s into a wooden block that is initially at rest. The bullet becomes lodged in the block, and the two slide together on the floor for a d
If you weigh 780 N on the earth, what would you weigh at the surface of a neutron star that has the same mass as our sun and a diameter of 17 km?
A ball of mass 0.240 grams and positive charge, q =39.3 microC, is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of theta =15.0 o
imagine adding electrons to the pin until the negative charge has the very large value 2.00 mC. how many electrons are added for every 10^9 electrons already present?
A sealed cubical container 25.0 cm on a side contains three times Avogadro's number of molecules at a temperature of 16.0°C. Find the force exerted by the gas on one of the walls of the contain
A stone with a mass of 0.800 is attached to one end of a string 0.600 long. The string will break if its tension exceeds 65.0 . The stone is whirled in a horizontal circle on a frictionless tabletop
A centrifugal pump is to be used to extract water from a condenser in which the vaccum is 640 mm of mercury. At rated discharge, the net positive suction head must be at least 3m above the cavitatio
The wave reflects from the speeder's car and returns to the police car, where its frequency is measured to be 324 Hz less than the emitted frequency. Find the speeder's speed with respect to the gro
A sound source emits sounds of frequency 200 Hz that travel through still air at 340 m/s. The listener moves at 70 m/s relative to still air toward the stationary source. What is the wavelength of
How much work (in joules) is done by the electric force when an electron is accelerated from the cathode to the anode?
A 4.60% solution by mass of an enzyme in water has an osmotic pressure of 23.0 torr at 289 K. Calculate the molar mass of this enzyme. (Assume that the density of the solution is 1.00 g/mL.)
The beam emerges from the laser at a point that is 1.10 m from the mirror and 1.80 m above the floor. After the reflection, how far from the base of the mirror does the beam strike the floor?