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Inside an elevator , a businessman is holding a large briefcase whose mass is equal to 4.0 Kg. A) compite the force exerted by the businessman to hold the briefcase while the elevator is at rest ? B) What is the force need it to hold the briefcase when the elevator accelerated upward at a rate of 1.5 m/s^2? C) What is the force needed to hold the briefcase if the elevator is in a free fall ? (I.e moving downward with acceleration equal to g )
batteries are listed by their cranking power which is the amount of current that the battery can produce for 30 sec a
Where on the modern periodic table would you probably find an element that is a dense gas at room temperature? EXPLAIN 3) What should be the most metallic element?
The ester ethyl p-nitrobenzoate is more reactive towards nucleophilic acyl substitution than ethyl p-methyoxybenzoate.
In the first half-life of the sample, the total number of disintegrations counted was 2.15 X 1020 . What is the atomic weight of the unknown element
A buffer contains 0.50 mol NH4^+ and 0.50 mol NH3 diluted with water to 1.0 L. How many moles of NaOH are required to increase the pH of the buffer to 10.00
What is the pH and the [OH-] of the solutions with the following [H3O+]? a) 2.3 x10-4 , b) 4.8 x10-8, c) 6.3 x10-2
Prepare 3 liters of 0.5 M glutamic acid buffer, with pH 4.1, from solid glutamic acid (pKa=4.2) and 2 M NaOH. How many grams of solid glutamic acid (MW=147 g/mol) would you have to use and how many mls of 2 M NaOH would you need?
which of the following obey the octet rule beh2 ccl3 seo2 2- pcl3 krcl2 no2? and if they do not obey the octet rule
How fast does the cart move after being loaded with ore? Assume that frictional forces with the flat surface may be neglected.
Question- The solubility of PbBr2 is measured and found to be 4.17 g/L. Use this information to calculate a Ksp value for lead bromide.
Calculate the number of moles of ions present in 58.5 g of a solution that is 8.68% Fe2(SO4)3 by mass. a) There are 0.0635 moles of ions in this solution. b) There are 0.0127 moles of ions in this solution.
Problem- Water is to be pumped from a lake to a ranger station on the side of a mountain. The flow rate is to be 95 gal/min, and the flow channel is a standard 1-in. Schedule 40 steel pipe. A pump capable of delivering 8 hp shaft work is available..
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