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The diameter of the circle in which the discus moves is about 2.26 m. If the thrower takes 1.32 s to complete one revolution, starting from rest, what will be the speed of the discus at release?
A child pulls a wagon with a force of 10 N by a handle making an angle of 19 degrees with the horizontal. If the wagon has a mass of 5.7 kg, to the nearest hundredth of a m/s2 what is the accelerati
The capacitor in an RC circuit (R = 180 O, C = 69 µF) is initially uncharged. Find the charge on the capacitor and the current in the circuit one time constant (t = RC) after the circuit is co
An electron has an initial velocity of 9.00 x 106 m/s in the x direction. It enters a uniform electric field = (400 N/C), which is in the y direction. (a) Find the acceleration of the electron. answer
How many moles of air must escape from a 10m x 8.0m x 5.0m room when the temperature is raised from 0c to 20c? Assume the pressure remains unchanged at one atmosphere while the room is heated.
How many grams of ethylene glycol, C2H4(OH)2, must be dissolved in 2000.0grams of water to lower the preezing point to -29.75 deg C? If the density of ethylene glycol is 1.12 g/mL, how many millilit
An 11W energy-efficient florescent lamp is designed to produce the same illumination as a conventional 80W lamp. How much does this energy-efficient lamp save during 89h of use? Assume a cost of $0.
The wire in a house circuit is rated at 22.8A and has a resistance of .24ohms. What is its power rating in W? and how much heat does the wire give off in 19.3 min in J?
Coal reserves in the united states are estimated to contain 4.00 x 10^16 moles of carbon. if the efficiency is 40%, how much gross energy can this reserve produce through the traditional process of
The rate constants of some reactions double with every 10 degreerise in temperature. Assume that a reaction takes place at 291 Kand 301 K. What must the activation energy be for the rate constant to
What height will the ball reach after the first bounce if it is instead thrown vertically downward from the same height at 5m/s?
Hydrides have been proposed as a means ofstoring hydrogen gas for fuel in solid form (the reactions thatform them are generally reversible). Take, for example magnesium hydride, MgH2.
(a) Where should the pivot be placed so that the board is balanced, ignoring the board's mass? (b) Find the pivot point if the board is uniform and has a mass of 15 kg.
We estimate that there are 255 million plug-in electric clocks in the United States, approximately one clock for each person. The clocks convert energy at the average rate of 8.1 W.
The water at the beach on the lake front contains 9.6 parts per billion of E-coli. While swimming you swallow 1.0 L of this water. How many grams of this bacteria did you swaallow?
If 2.00 grams of aluminum nitrate is reacted with 3.50 grams of sodium carbonate, what is the theoretical yield in grams of aluminum carbonate?
A 4.8-kg block slides down an inclined plane that makes an angle of 25° with the horizontal. Starting from rest, the block slides a distance of 2.1 m in 4.8 s. Find the coefficient of kinetic fr
A protein is known to contain 310 amino acid residues. How many grams does one molecule of this protein weigh? Hint: How do we estimate the molecular weight of a protein, when all we have are the nu
When a test charge q0 = 7 nC is placed at the origin, it experiences a force of 8 x 10-4 N in the positive y direction. (a) What is the electric field at the origin? answer in (N/C j)
A hollow sphere of radius 0.40 m, with rotational inertia I = 0.020 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at '> to the horizontal. At a certai
Hydrogen gas is generated by adding zinc metal to hydrochloricacid and collected over a liquid whoses vapor pressure is the sameas pure water at 20.0 degree C (18 torr).
A point charge of -1.5 µC is located at the origin. A second point charge of 14 µC is at x = 1 m, y = 0.5 m. Find the x and y coordinates of the position at which an electron would be in
Three charges, each of magnitude 3 nC, are at separate corners of a square of edge length 1 cm. The two charges at opposite corners are positive, and the other charge is negative. Find the force exe
1) why does a blue object look blue in white light? Why do black objects appear black in white light?
Calculate the mass of nitrogen dissolved at room temperature in 80.0 L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.