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How many milligrams will be present after 12 weeks and how long will it take for 75% of the original sample to decay?
An alpha particle (the nucleus of a helium atom, with charge +2e and a mass four times that of a proton), What is the speed of the antiproton when the particles are 1.1nm apart
The load and the spring are taken down. Two people pull in opposite directions on the ends of the spring, each with a force of 206 N. Find the length of the spring in this situation
Calculate the equilibrium constant Ksp for Mg(OH)2 (s) at 25 degrees celcius. Is the dissolution of Mg(OH)2 endothermic or exothermic
The electric field on the axis of a uniformly charged ring has magnitude 400 at a point 6.0 from the ring center. Find the ring's charge
A high-speed photograph of a club hitting a golf ball, find the average force exerted on the ball by the club
What mass of ammonium chloride should be added to 2.45L of a 0.145M NH3 in order to obtain a buffer with a pH of 9.45
A parallel plate capacitor in air has a plate separation of 1.5 cm and a plate area of 25 cm^2. Determine the charge on the plate after immersion
A child slides down a slide with a 23° incline, Calculate the coefficient of kinetic friction between the slide and the child
The mass of the final solution is 73.0 grams, and its heat capacity is 3.85 J/g°C; the heat capacity of the calorimeter is 5.0 J/°C. Calculate the Hreaction in kJ/mol metal.
A major leaguer hits a baseball so that it leaves the bat at a speed of 28.0 m/s and at an angle of 35.3 degrees above the horizontal. Calculate the vertical component of the baseball's velocity
A stellar object is emitting radiation at 3.75 mm. If the detector is capturing 3.3*10^8 protons per second at this wavelength, what is the total energy of the photons detected in one hour
The solubility product constant of Sr(IO3)2 is 1.14 × 10?7. What volume of 0.0485 M S2O32 is required to titrate a 15.0 mL sample of a saturated solution Sr(IO3)2
A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. What is the average power generated by the lifting force
An air-filled spherical capacitor is constructed with inner and outer shell radii of 7.00cm and 14.0cm, respectively. Calculate the capacitance of the device
The standard enthalpy change for the reaction below is 436.4 kJ/mol. Calculate the standard enthalpy of formation of atomic hydrogen (H). H2(g)-->H(g) + H(g)
A saturated solution of potassium phosphate was filtered and then titrated. The concentration of [K+] was found to be 0.00956 M. What is the concentration of phosphate ions in this saturated solutio
How many grams of ammonia gas would be formed when 11.2 Liters of hydrogen gas at STP reacts with 4.72 Liters of nitrogen gas
Regarding the Earth and a cloud layer 800 m above the earth as the "plates" of a capacitor, calculate the capacitance. What is the maximum charge the cloud can hold
Calculate the Molar mass of a gas if 2.20g occupies 0.885L at 690 torr and 36 degrees C
A 70,000 kg spaceship wants to orbit a tiny black hole at a height of 10,000 m. What speed should the captain tell the computer to set the spaceship for
Slope of a horizontal line and the rate of depreciation of the asset is given by the negative of the slope of the depreciation line.
A 56 kg woman and a 78 kg man stand 13.0 m apart on frictionless ice, How far from the man is their center of mass