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A girl rides an escalator that moves her upward at a constant speed. As the girl rises, how do her gravitational energy and kinetic energy change?
A football coach sits on a sled while to of his players build their strength by dragging the sled across the field with ropes. The friction force in the sled is 1000N and the angle between the two r
When 35.0 mL of 0.400 M hydrochloric acid and 35.0 mL of 0.400 M sodium nitrite are combined,what the pH of the resulting solution will be :
A student is given an antacid tablet that weighed 5.6832g. How much stomach acid was neutralized by the 4.3628 g tablet?
Two packing crates of masses 10.0 kg and 5.00 kg are connected by a light string that passes over a frictionless pulley. The 10kg crate hangs vertically and the 5.00-kg crate lies on a smooth inclin
A uniform steel beam has a mass of 940 kg. On it is resting half of an identical beam, What is the vertical support force at each end? left end and right end
The solution of iodine was standardized with ascorbic acid. A 0.1150g sample of ascorbic acid required 28.37 mL or I2 to reach a starch end point. Calculate the molarity of the iodine solution.
A student of weight 655 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitude of the normal force N on the student from the seat is 564 N. (a) What
A straight wire of length L and carrying a current I stays suspended horizontally in mid air in a region where there is uniform magnetic field B. The linear mass density of the wire is lambda. Obta
Predict the predominant alkene product that would form when 2-bromo-2-methylpentane is treated with sodium methoxide in methanol. If the base were changed to KOC(CH2CH3)3 would the same alkene pred
You pull a 12 kg sled across the floor with a strap that is at an angle of 31° above the horizontal with a force 76 N. Find the magnitude of the acceleration of the sled, given that the coeffici
Calculate the volume of 3M aqueous sodium hydroxide needed to neutralize the acetic and phosphoric acids in the synthesis of acetyl-ferrocene.
The equilibrium constant for the reaction is 4.2 x 10 -2 calculate the reaction coefficient and determine in which direction the reaction is moving.
A 2.1 x 10^3 kg car starts from rest at the top of a driveway tat is sloped at an angle of 20 degrees with the horizontal. An average friction force of 4.0 x 10^3 N impedes the cars motion so that
A space traveler weighs 550 N on earth. What will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth?
A Cessna aircraft has a lift-off speed of 130 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 200 m?
A solution containing 9.80g of barium chloride is mixed with a solution containing 5.10g of sodium sulfate. a)What reactant is in excess? b)Determine the excess reactant. c)Predict the mass of the p
Now find the magnitude of the force on an electron placed at point P. Recall that the charge on an electron has magnitude e = 1.60 times 10^{-19} ; {rm C}.
The cylinders are rigidly connected to each other but are free to rotate without friction on a common axle. The moment of inertia of the pair of cylinders is I = 45 kgm2 Also r1 = 0.5 meter, r2 = 1.
If the total pres- sure is 780 torr, the CO has a partial pressure of 330 torr and the CO2 has a partial pressure of 330 torr, what is the partial pressure of O2?
A buffer consists of 0.22 M Na2HPO4 and 0.2 M Na3PO4. Given that the K values for H3PO4 are, Ka1 = 7.2 x 10-3, Ka2 = 6.3 x 10-8, and Ka3 = 4.2 x 10-13, calculate the pH for this buffer.
An ac generator has a frequency of 2.4 kHz and a voltage of 240 V. An inductance L1 =6.0 mH is connected across its terminals. Then a second inductance L2 =10 mH is connected in parallel with L1. Fi
What volume in mL will a sample of F2 occupy in a syringe at 5.5 atm , if the F2 has a volume of 25.0 mL at 1.2 atm?