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Write down the dissolution equation for nickel(II) perchlorate dissolving in water. (Perchlorate is a polyatomic ion with the formula ClO41-.) If four moles of the ionic compound are dissolved, then
A high-school pitcher is employing a ballistic pendulum to determine the speed of his fastball. A 3.3-kg lump of clay is suspended from a cord 2.0-m long.
A bat emits a sound whose frequency is 82.8 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 38.7 oC, so the speed of sound is not 343 m/s. Assume that air behav
A particle of mass 4.12 × 10-27 kg, moving at 4.62 × 105 m/s, strikes an identical particle which is initially at rest. After the interaction, the particles (which can't be distinguished
The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g°C, respectively, and the enthalpy of fusion for ice is 6.02 kJ/mol.
Determine how much heat is evolved or absorbed when 30.0g of lithium iodide completely dissolves in water.
The atmospheric pressure at the top of the mountain is 1.7 atm. The car is driven down to sea level, where the atmospheric pressure is 1.0 atm and the air inside the tire is heated to 350 K. At sea
What type of spectrum would you expect to see from the glowing parts of the nebula? Why?
How many grams of pure, solid NaOH are required to make 500 mL of 0.15M NaOH solution? Express your answer to 2 significant figures, e.g. 3.3 g.
An Atwood machine consists of two masses, = 6.6 and = 8.0 , connected by a cord that passes over a pulley free to rotate about a fixed axis. The pulley is a solid cylinder of radius = 0.40 and mass
Does the polarity of the solvent of the various solvent mixtures seem to affect the completeness of the separation of dyes? Why might this be so?
The analysis of a compound showed that it contained 0.903 mol of C, 0.0430 mol of H, 0.602 mol of O, and 0.301 mol of N. How many Nitrogen atoms are there in the empirical formula for this compound?
A loudspeaker of mass 22.0 {rm kg} is suspended a distance of h = 2.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.10 {rm m}.
A baby grand piano with a mass of 285 kg hangs from two cables. The angle between the horizontal and the left cable is 27 degrees. The angle between the horizontal and the right cable is 45 degrees
A diving board of length 3.00 {rm m} is supported at a point 1.00 {rm m} from the end, and a diver weighing 550 {rm N} stands at the free end . The diving board is of uniform cross section and weig
World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15m/s^2. How much horizontal force F must a sprinter of mass 62.0 kg
Consider a homogeneous gallium arsenide semiconductor at T = 300 K with Nd = 1016 cm-3 and Na = 0. Calculate the thermal-equilibrium values of electron and hole concentrations.
An 88g arrow is fired from a bow whose stringht exerts an average force of 110N on the arrow over a distance of 78cm. What is the speed of the arrow as it leaves the bow?
A tennis player hits a ball 2.0 m above the ground. The ball leaves his racket with a speed of 16.0 m/s at an angle 5.5 degrees above the horizontal. The horizontal distance to the net is 7.0 m and
A humanitarian aid package is dropped from a plane flying horizontally 500 m above the ground with a speed 100 m/s. What is the speed of the package at the time of impact? (Calculate the total speed
Jane's mass is 20 kg. She starts from rest at the top of a 5 m tall slide and reaches a velocity of 5 m/s at the bottom of the slide. What is the change in thermal energy of the Lily/earth/slide sy
A peg is located a distance h directly below the point of attachment of the cord. If h = 0.70 L, what will be the speed of the ball when it reaches the top of its circular path about the peg? (Use t
Megan's mass is 26 kg. She starts from rest at the top of a 4.8 m tall slide and reaches a velocity of 5.1 m/s at the bottom of the slide. What is the change in thermal energy of the Megan/earth/sl
Two small spheres spaced 40.0 cm apart have an equal charge. How many excess electrongs must be present on each sphere if the magnitude of the force of repulsion between them is 5.37x 10^-21 newton
A force stretches a wire by 0.60mm. A third wire of the same material has the same length and twice the diameter as the first. How far will it be stretched by the same force?