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The half-life of oxygen -15 is 124 seconds. If a sample of oxygen-15 has an activity of 4000 becquerels, how many minutes will elapse before it reaches an activity of 500 becquerels?
A bicycle wheel, of radius 0.34 m and mass 3 kg (concentrated on the rim), is rotating at 4.14 rev/s. After 45 s the wheel comes to a stop because of friction. What is the magnitude of the average t
If the initial concentration of chlorine is 0.030 M and of bromine monochloride is0.020 M, what is the equilibrium concentration of bromine?
An object has a kinetic energy of 312 J and a momentum of magnitude 21.8 kg⋅m/s. Find the speed and the mass of the object.
A drum rotates around its central axis at an angular velocit of 12.60 rads/s. If the drum then slows at a constant rate of 4.20 rads/s2 (a) how much time does it take and (b) through what angle does
Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water. At179°C the rate constant is 0.602 hr-1 g-1 and at164.5°C the rate constant is 0.141 hr-1 g-1
A 6090 kg space prove moving nose-first toward Jupiter at 105 m/s relative to th sun fires it rocket engine, ejecting 80.0 kg of exhaust at a speed of 253 m/s relative to the space probe. What is th
Write and balance the chemical equation when magnesiumreplaces the hydrogen in an aqueous solution of hydrogen chlorideto form magnesium chloride and hydrogen gas.
Determine the radial acceleration of the car at this time (when it has traveled 1/4 of a circle).
Identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent in each unbalanced redox equation.
Block 1 of mass m1 slides along a frictionless floor and into a one dimensional elastic collision with a stationary block 2 of mass m2 = 3m1. Prior to the collision, the center of mass of the two-bl
What is the molality of ethylene glycol (molar mass62.07 g/mol) in the recommended 50 weight percent aqueous solution used in the radiators of cars?
A 5.20 g bullet of mass 10 g strikes a ballistic pendulum of mass 2. kg. The center of mass of the pendulum rises a vertical distance of 12 cm. Assuming that the bullet remains embedded in the pendu
A space vehicle traveling at 4300 km/h relative to earth when the exhausted rocked motor (mass 4m) is disengaged and sent backward with a speed of 82 km/h relative to the command module (mas m). Wha
The boiling point of a 0.50 m NaCl solution is 100.50 C. What is the boiling point elevation constant for water, based on this result?
A pair of identical coils, each having a radius of 30 cm, are separated by a distance equal to their radii, that is, 30 cm. Called Helmholtz coils, they are coaxial and carry equal currents in direc
Define potential difference. What is the difference between electric potential and electric potential energy? What is the unit for potential difference?
Magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas. An excess of magnesium isreacted with 6.00 x 10-2 moles of hydrochloric acid and all of the hydroge
A common shorthand way to represent a voltaic cell is to listits components as follows: anode|anode solution||cathode solution|cathode. A double vertical line represents a salt bridgeor porous barri
A uniform solid ball rolls smoothly along a floor, then up a ramp at 14.0°. It momentarily stops when it has rolled 1.30 m along the ramp. What was its initial speed?
A uniform cylinder of radius 40 cm and mass 22 kg is mounted so as to rotate freely about a horizontal axis that is parallel to and 55.0 cm from the central longitudinal axis of the cylinder. (a) W
3.00 g sample of KClO3 decomposes and the oxygen at 240C and0.982 atm is collected. What volume of oxygen gas will be collected, assuming 100% yield. (Formula mass of potassium chlorate is 122.5 g/m
A container has in it 20.0 g of Ar and 10.0 of Ne. The pressure in the container is 1000 torr. After 5.0 g of Ne is removed from this container, the pressure becomes (volume and temperature remain t
A cannon ball is shot with 99 m/s horizontal velocity. It achieves a maximum height of 112 m. How far did the cannon ball travel horizontally?
The mass of a block is 4.2 N, the average force of kinetic friction is 66.6 N and the average force of static friction is 120 N. Calculate the following.