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A 50N force is applied to a wire with a radius of 1mm. The wire was 0.7m long, but is now 0.75m long. what is the young's modulus for the material the wire is made of?
The screen is now moved 2.4 m further away. What is the new distance between the central and the second-order bright fringe?
If the initial concentration of AB is 0.260 M, and thereaction mixture initially contains no products, what are the concentrations of A and B after 70 s?
A 1.10 balloon is filled with helium gas until it becomes a 23.0 -diameter sphere. What maximum mass can be tied to the balloon (with a massless string) without the balloon sinking to the floor?
(a) Find the x and y components of the net momentum of this system. (b) What are the magnitude and direction of the net momentum?
Canadian 10¢ and 25¢ coins are made of pure nickel which has a density of 8.902 g/cm3. Suppose each dime weighs 2.14 g and each quarter weighs 5.35 g.
Find the net electric field (magnitude and direction) at x = 0 cm. (Use the sign of your answer to indicate the direction along the x-axis.)
Assume that a lift force acting perpendicular to the wings acts on the aircraft as it moves through the air. What is the radius of the circle in which the plane is flying?
In a portable oxygen system, the oxygen (O2) iscontained in a cylinder whose volume is 0.00250 m3. Afull cylinder has an absolute pressure of 1.20 x107 Pa when the temperature is 298 K.
Calculate the diameter of a disk 10 centimeners thick required to store 1 megajoule of energy, if this disk is rotating about an axis perpendicular to the disk with 90 rotations per minute. It is m
The area of a typical eardrum is about 5.00 x 10-5 m2. (a) calculate the average sound power incident on an eardrum at the threshold of pain, which corresponds to an intensity of 1.00 W/m2. (b) How
Assume the man requires a time interval of (?t) to respond to the warning. How close to the sidewalk can the flowerpot fall before it is too late for a warning shouted from the balcony to reach the
The ionization energies of sodium (in kJ/mol), starting withthe first and ending with the eleventh, are 495.9, 4560, 6900,9540, 13,400, 16,600, 20,120, 25,490, 28,930, 141,360, 170,000.
Nitrogen gas in an expandable container is cooled from 50.0°C to 10.0°C with the pressure held constant at 3.00 x 105 Pa. The total heat liberated by the gas is 2.50 x 104 J. Assume that the g
In 1996 physicists created an anti-atom of hydrogen. In such an atom, which is the antimatter equivalent of an ordinary atom, the electrical charges of all the component particles are reversed.
When balancing redox reactions that occur in acidicsolutions. The redox reactions of silver halides are used to:
A fire hose exerts a force on the person holding it. This is because the water accelerates as it goes from the hose through the nozzle. How much force is required to hold a 6.9cm-diameter hose deliv
If the universe is approximated as an ideal blackbody, calculate the temperature of this residual radiation.
A compounds analyzes to be 61.7% Cl, 26.72% P, and 12.11% N. 1.2952 g of the compound was dissolved in 15.00 ml of benzene (density of benzene=.879 g/ml). Producing a solution freezing at 4.03 degre
Calculate the volume of 6 MNaOH necessary to react completely with 10.0 mmol of methylsalicylate. How much of the 6 M NaOH that you will use is in excess of the theoretical amount? Why do we use so
Your microwave oven draws 1100 of electrical power when it is running. If it takes 45 for this microwave oven to raise the temperature of the coffee to 60 , what is the efficiency of heating with th
A 28.2 g sample of nickel metal is heated to 99.8 degrees Celsiusand place in a coffee-cup calorimeter containing 150.0 g of waterat 23.5 degrees Celsius. After the metal cools, the final temperatur
A glass tube of radius 0.80cm contains liquid mercury to a depth of 64.0cm at 12 deg. Find the depth of the mercury column at 100 deg. Assume that the linear expansion coefficient of the glass is 10
If you dissolve caffeine in acid a proton goes onto one of thenitrogens to give the conjugate acid of caffeine,caffeineH+ . The acid dissociation costant(Ka) of caffeineH+ is Ka =0.26M.
An automobile tire is rated to last for 30,000 miles. Estimate the number of revolutions the tire will make in its lifetime.