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1.) A 100-kg box on the right and a 45-kg box on the left are tied together by a horizontal cable. The 100-kg box is acted upon by an external force of 560 N to the right. The frictional force exerted by the floor on the 100-kg box is 40 N and the frictional force exerted by the floor on the 45-kg box is 15 N. What is the magnitude of the tension in the connecting cable?
2.) Two people play tug of war. The 100-kg person on the left pulls with 1,000 N, and the 70-kg person on the right pulls with 830 N. Assume that neither person releases their grip on the rope with either hand at any time, assume that the rope is always taut, and assume that the rope does not stretch. What is the magnitude of the tension in the rope in Newtons?
3.) A 69-kg woman in an elevator is accelerating downward at a rate of 1.3 m/s2. What is the magnitude of the force exerted by the elevator floor on the woman's feet?
4.) In a fit, a toddler throws straight down his favorite 2 kg toy with an initial velocity of 1 m/s. What is the magnitude of the velocity in m/s of the toy when it strikes the ground 0.5 seconds later?
How many moles of Allyl Sulfide (C3H5)2S in 23.2g? How many H atoms are in 0.85 mole of allyl sulfide?How many atoms of Carbon are in 4.20 X 10^23 molecules of allyl sulfide.
A tetrapeptide is abbreviated as DPKH. Which amino acid is at the N-terminal and which is at the C-terminal. Show how to form a dipeptide aspartylserine.
A gas has a volume of 546 mL at a temperature of -75°C. What volume will the gas occupy at 90.0°C, assuming constant pressure? How many moles of CO2 would be contained in 7.0 L at 125 kPa and 36°C?
It required 16ml of a sodium hydroxide solution titrated against a standard solution of 0.79g of potassium hydrogen phthalate in water to reach equivalence point. What is the molarity of the sodium hydroxide?
a gas has a volume of 10 l at 0 degrees c. what is the final temperature of the gas in c if its volume increases to 27
A solution of H2SO4 and KI is then added to conver the MnO2 to MN^2+, and the iodide is converted to I2. The I2 is then titrated with standardized Na2S2O3. Calculate the amount of O2 in 25.0mL of water if the titration requires 2.45ml of 0.0112 M N..
Which of the following anions is the most nucleophilic in an SN2 reaction? A) h2c=ch- B)ch3ch2- C)ch-triplebonds-C A) B B) C C) A
A mixture of gases is prepared for laboratory experiments by combining 5.0 L of oxygen, 0.68 L of nitrogen, and 0.34 L of carbon dioxide. Determine the percentage of nitrogen in the mixture
When a compound containing censium ion is heated in a bunsen burner flame,photons with an energy of 4.30x 10-19 J are emitted, Explain the color of the censium flame
You have a solution of a buffer with 10 mMoles of the buffer. Initially the solution has a pH of 6.8. You add 100 mM kOH and the pH rises to 7.1. The pKa of the buffer is 6.3. How many mls of KOH did you add
Calculate the pH of a 0.10 M solution of sodium formate (NaHCOO) given that the Ka of formic acid (HCOOH) is 1.8 x 10-4.
Determine the freezing point and calculate the final temperature if initially this iron nail was at temperature of 28 degree Celsius?
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