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A rescue boat with speed 21.0 km/hr (with respect to the water) sets off from the dock at the optimum angle to reach the child as fast as possible. How far from the dock does the boat reach the chil
An unseeded BOD test is conducted on a polluted surface water sample by adding 100 mL of the sample to a 300-mL BOD bottle and filling with dilution water.
100 g of ice at 0 degrees C and 100 g of steam at 100 degrees C interact thermally in a well-insulated container. What is the final state of the system?
The momentum of a particle is given by m*v where m is the mass ofthe particle and v its velocity. The kinetic energy is givenby 1/2 m*v^2. Two particles have the same de-Broglie wave length, however
27 g of copper pellets are removed from a 300 degrees C oven and immediately dropped into 90 mL of water at 22 degrees C in an insulated cup. What will the new water temperature be?
An element crystalizes in a body centered cubic lattice. theedge of the unit cell is 3.36 angstroms, and the density of thecrystal is 7.97g/ cm3. what is the atomic weight of the element in grams pe
a) If a mass of 2kg is attached to a string of length 1m and pulled back to the angle shown (30 degrees from straight down), what velocity will the mass have at the "bottom" of its swing?
Demonstrate proper notation and use of units by converting the pressure rating written on a tire of 35 lb/in^2 to kilopascalas. Use the following 1N=.2248 lb; in=2.54cm.
Solid Calcium hydroxide is dissolved in 500 mL of water until the pH of the solution is 10.75. Calculate the grams of calcium hydroxide dissolved assuming calcium hydroxide is a strong base.
When molecules are represented by molecularmodels, what does each sphere represent? How big is the nucleus of an atom in comparison to the sphere used to represent an atom in amolecular model?
The hose lies horizontally on the ground, and a stream of water sprays vertically out of a small leak to a height of 0.80 . aWhat is the pressure inside the hose?
If the vapor pressure for benzene and toluene at 25 degrees Celsius is 94 mmHgand 20 mmHg respectively, What is the approximate vapor pressure of a solution made from 25% benzene and 75% toluene at
If the wire, which is fixed at both ends, vibrates at its fundamental frequency, the sound wave it generates excites the second vibrational mode of the tube of air. What is the tension in the wire?
An object in equilibrium has three forces exerted on it. A 18-N force acts at 90°, and a 62-N force acts at 61°. What is the magnitude and direction of the third force?
An office window has dimensions 3.4m by 2.1m. As a result of the passage of a storm, the outside air pressure drops to 0.96atm, but inside the pressure is held at 1.0atm. What net force pushes out o
A new temperature scale is proposed based on the melting andboiling point of benzene. ( the melting point os benzeneis 5.53 (degree Celsius) and the boiling point ofbenzene is 80.10 (degree Celsius
The rocket attains its launch speed in a negligibly short period of time, after which its engines shut down and the rocket coasts. By how much does the rocket clear the top of the wall?
A major-league pitcher can throw a baseball in excess of 40.8 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches the catcher who is 17.4 m away from th
The activation energy for a reaction is changed from 241 kJ/molto 55.5 kJ/molat 641 K by the introduction ofa catalyst. If the uncatalyzed reaction takesabout 2890 years to occur, about how long wil
Suppose that two balls of mass 2.5 x 10^-4 kg each carry equal charges and are suspended by identical threads of length 13 cm anchored 24cm apart. If each thread makes and angle of 20 degrees with t
An ocean liner leaves New York City and travels 16.0° north of east for 245 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship'
Starting in the ground state n = 1 is a hydrogen atom, an electronis excited to a higher energy level by absorption of 121.6 nmlight. What is the final energy state of the electron?
A solid sphere with radius 0.050m and a mass of 3.0kg has a rod through its center. a net torque of 6.0*10^-4 Nm is used to spin the sphere about the rod. what is the sphere's angular acceleation?
When 12.3 g of an unknown, non-volatile, non-electrolyte, X was dissolved in 100. g of methanol, the vapor pressure of the solvent decreased from 122.7 torr to 118.6 torr at 298 K. Calculate the mo
An Angry Basketball player throws the ball straight down to the floor. If the ball bounces straight up and returns to the floor 2.5 seconds after first striking it what was the balls greatest height