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Two lightbulbs operate on the same potential difference. What is the ratio of the current in bulb A to the current in bulb B
An object-spring system moving with simple harmonic motion has an amplitude A, What is the total energy of the system in terms of k and A only
A skier of mass 68.4 kg glides down a hill of slope 26.5 degree at constant speed. find the coefficient of friction between her skis and the slope
A force F= (6x - 2y)N acts on a particle that undergoes a displacement delta r= (3x + y)m. find the work done by the force on the particle
A 0.10-mol sample of a diprotic acid, H2A, is dissolved in 250 mL of water. The Ka1 of this acid is 1.0 x 10-5 and Ka2 is 1.0 x 10-10. Calculate the concentration of A2- in this solution.
Carbonyl fluoride, , is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, via the reaction
what is the kinetic energy of a ball of mass 16.1 kg at the apex (highest point) of its trajectory, if it is thrown with an initial speed of 45 mph
When light of frequency 6.88×1015 s-1 shines on the surface of a metal, electrons are ejected with a maximum kinetic energy of 3.40×10-19 J. Calculate the wavelength of this light.
A skier of mass m glides down a hill of slope ? at constant speed. If she travels a distance d down the hill, what is the work done by friction
When 1717 J of heat energy is added to 40.0 g of ethanol, C2H6O, the temperature increases by 17.5 °C. Calculate the molar heat capacity of C2H6O.
would the separation of the grape soda dyes work equally well if you reversed the order of IPA concentrations and used 20% IPA first to remove the blue dye and then switched to 5% IPA to remove the
Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 23cm apart. What is the wavelength of the sound
The lowest note on a grand piano has a frequency of 27.5 \rm Hz. The entire string is 2.00 \rm m long, What tension is needed to tune this string properly
A researcher studying the nutritional value of a new candy places a 5.30-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen.
A charge of 6.53mC is placed at each corner of a square .470 m on a side. Determine the direction of the force on each charge
A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, What was the bear's average velocity
A certain reaction has an enthalpy of change in H = 54 kJ and an activation energy of Ea=81 kJ. What is the activation energy of the reverse reaction
One of the weapons considered for the "Star Wars" antimissile system is a laser that could destroy ballistic missiles. What laser beam intensity will produce such a field
Which too factors determine whether a collision between two reactant molecules will result in a reaction. select all that apply.
A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20 deg. above the horizontal
A pump is used to empty a 6000{\rm L} wading pool. The water exits the 2.5-cm-diameter hose at a speed of 2.0{\rm m}/{\rm s}
The reverse reaction is first order in B and the rate constant is 8.50 X 10^-1 What is the value of the equilibrium constant for the reaction A (equilibrium) B at this temperature
Water flows at 0.25{\rm L}/{\rm s} through a 12-m-long garden hose 2.0{\rm cm} in diameter that is lying flat on the ground. find the gauge pressure of the water where it enters the hose
NASA's Cassini mission to Saturn released a probe on December 25, 2004, that landed on the Saturnian moon Titan on January 14, How many revolutions had Huygens completed when it was 130 yards from the
Describe the preparation of 40 liters of 0.02 M , pH 6.9, starting from a 2 M H3PO4 solution and a 1 M KOH solution