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An auto race is held on a circular track. A car completes one lap in a time of 20.5 s, with an average tangential speed of 47.5 m/s. Find the following. (a) the average angular speed
Aluminum and iron blocks of the same weight are heated to 250?C. These blocks are dropped into a bucket of water. Assuming enough heat is available in the blocks, which block will heat the water th
At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 7.1 m above the water. One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way d
A 35.8-g sample of cadmium metal was melted by an electric heater providing 4.66 J/s of heat. If it took 6.92 min from the time themetal began to melt until it was completely melted, what is the hea
If ΔG= - and ΔS= + for two dissolving process, how could one be endothermic and one be exothermic? is there more to consider than just the dissolving process?
After 10.0 s, a spinning roulette wheel at a casino has slowed down to an angular velocity of +1.72 rad/s. During this time, the wheel has an angular acceleration of -5.05 rad/s2. Determine the angu
(a) How much time does it take for the bike to come to rest? (b) What is the angular acceleration of each wheel?
When copper (II) sulfate penthydrate is heated, the deep blue color of the hydrate changes to the white color of the anhydrous salt. Determine why such a vivid change in color is common when such e
Discuss a real-life example in which you would need to add, subtract, multiply, or divide fractions or mixed numbers, and show the math.
The concentrated sulfuric acid we use in the laboratoryis 94.1 percent H2SO4 by mass. Calculate the molality and molarity of the acid solution. The density of the solutionis 1.80 g/mL.
A basketball player is balancing a spinning basketball on the tip of his finger. The angular velocity of the ball slows down from 20.0 to 13.9 rad/s, during the slow down the angular displacement is
If the concentration of flouridated drinking water is 1 X 10-5 M and the calcium ion concentration in blood is 2.5 X 10 -3 M,then why is there no danger of CaF2 precipitating in the blood stream aft
An electric circular saw is designed to reach its final angular speed, starting from rest, in 1.40 s. Its average angular acceleration is 325 rad/s2. Obtain its final angular speed.
A circular coil of wire with cross-sectional area of 0.033 m2 is exposed to a uniform magnetic field that is perpendicular to the plane of the coil. The magnetic field magnitude decreases from 0.56
The freezing-point depression of a 0.500m MgSO4 solution is 0.265°C. Determine the experimental van't Hofffactor of MgSO4 at this concentration.
The marrige rate (marriages per year) in the U.S. has been declining recently, w/ about 2e^-0.038t million marriages per year, where t is the number of years since 2010.
An RCL series circuit has a 18-ohm resistor, a 0.050-H inductor, and a 1.5x10-4 F capacitor. The generator has an rms voltage of 240 volts. What is the rms current in the circuit when the generator
A sample of neon occupies 105 liters at 27 degrees C under a pressure of 985 torr. What volume would it occupy at standard conditions?
The concentration of commercially available concentrated nitricacid is 70.0 percent by mass, or 15.9 M. Calculate the density of the solution.
When an 83.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.10 x 103 J. By how much does the potential energy of a 25.0
A 261-mL sample of a sugar solution containing 1.23 g of the sugarhas an osmotic pressure of 32.4 mm Hg at 36°C. What is the molar mass of the sugar?
Factor the polynomial function to determine the x intercepts and the y intercept. Enter all of the x-intercepts from smallest to largest.
A layer of diamond (n = 2.417) lies on top of a layer of sapphire (n = 1.797). What is the critical angle for total internal reflection between these two layers?
Write four equations showing structures for the reactions used in separating and recovering m-nitroaniline, benzoic acid, and naphthalene.
A horizontal wire that is 4.4 m long is exposed to a uniform external magnetic field of magnitude 79 mT (millitesla). The external field is directed at an angle of 39o below the horizontal. The magn