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The fahrenheit temperature is 98 on a hot summer day. What is the reading on the Kelvin scale?
155 grams unkown substance was heated from 25.0c to 40c absorbed 5696j of energy what is the heat of the substance ?
Consider the following reaction carried out in a 2.0 L pressure vessel at 500K. calculate the final x value using quadratic formula.
To explain why he seems to hang in the air, calculate the ratio of the time he is above ymax/2 moving up to the time it takes him to go from the floor to that height. You may ignore air resistance.
Two horizontal forces, 225 N and 165 N, are exerted on a canoe. If the these forces are applied in the same directions, find the net horizontal force on the canoe.
A hydrocarbon mixture consists of 60.0% by mass of C3H8 and 40% of CxHy. When 10.0 g of this mixture is burned, 29.0 g CO2 and 18.8 g H2O are the only products. What is the formula of the unknown hy
A space vehicle is traveling at 5200 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 77 km/h relative to the command module. The mass of t
An electrolytic cell is set up with Cd(s) in Cd(NO3)2 (aq) and Zn(s) in Zn(NO3)2 (aq). Initially both electrodes weigh 5.00g. After running the cell for a time the electrode in the one half cell wei
Two forces, and , act at a point, as shown in the picture. has a magnitude of 9.00 and is directed at an angle of = 62.0 above the negative x axis in the second quadrant. has a magnitude of 6.40 and
Under these conditions, what would be the effect on the following atomic spectral lines (viz. number of lines and line positions).
A man pulls a 50 kg box at constant speed across the floor with a rope. He applies a 200N force at an angle of 30 degrees. Sum the forces in the x-direction. 1) what is the frictional force opposing
After falling from rest from a height of 28 m, a 0.46 kg ball rebounds upward, reaching a height of 18 m. If the contact between ball and ground lasted 1.7 ms, what average force was exerted on the
The volume of the gas is 201 mL measured at .989 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure of water at 23°C = 0.0277 atm.)
What is the acceleration of the cannonball just before it hits the balloon?
A horse canters away from its trainer in a straight line, moving 118 m away in 14.0 s. It then turns abruptly and gallops halfway back in 5.0 s. Find the average speed and velocity
Mom made the kids 2 L of Kool-Aid by mixing 5.0 g sugar (C12H22O11), 10.2 mg of Kool-Aid powder (a proprietary mixture of ingredients), and water. What is the concentration of sugar in the Kool-Aid
Calculate the pH of a solution made by adding 80. g of sodium acetate, NaCH3COO, to 39 g of acetic acid, CH3COOH, and dissolving in water to make 500. mL of solution.
A 87 arrow is fired from a bow whose string exerts an average force of 120N on the arrow over a distance of 78cm. What is the speed of the arrow as it leaves the bow?
8.533 x 1022 molecules of Strontium hydroxide (Sr(OH)2), how many milligrams would you need to weigh out?
A charge of -3.80 nC and a charge of -6.80 nC are separated by a distance of 40.0 cm. Find the position at which a third charge of +7.60 nC can be placed so that the net electrostatic force on it i
You place 100 g of ethanol and 100 g of water in a refrigerator. Initially, both are at room temperature. Which of the two liquid samples will cool faster? explain why this happens.
What is the work of lift with weight = 1.29×10^3 kg accelerating uniformly from rest to 10.8 m/s in 2.10 s.
a mixture of 0.200g of H2, 1.00g of N2, and 0.820 g of Ar is stored in a closed container at standard temperature and pressure. What is the volume of the container assuming that the gases exhibit id
A student examines a ladybug using a magnifying glass with focal length of 5.0 cm. He holds the magnifying glass 3.5 cm above the ladybug. What is the magnification?
A 25.0 mL sample of a 0.080 M solution of aqueous trimethylamine is titrated with a 0.10 M solution of HCl. Calculate the pH of the solution after 10.0, 20.0, and 30.0 mL of acid have been added; pK