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A ball is dropped from the top of an 80 m building. Does it reach the ground in 4.0 s? (Hint: See Figure 2.7.) With what speed does the ball in Exercise 15 hit the ground?
Exercise 15
A car travels on a straight, level road.
(a) Starting from rest, the car is going 44 ft/s (30 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s2?
(b) In 4.0 more seconds, the car is going 88 ft/s (60 mi/h). What is the car's average acceleration for this time period?
(c) The car then slows to 66 ft/s (45 mi/h) in 3.0 s. What is the average acceleration for this time period?
(d) What is the overall average acceleration for the total time? (Note these convenient British unit conversions: 60 mi/h 88 ft/s, 45 mi/h 66 ft/s, and 30 mi/h 44 ft/s.)
When a solution of a chromium salt X is electrolysed, chromium metal is deposited on the cathode, according to the following equation. Crlaq) ne- Cr(s) When a current of 'IAA was passed for 40 minutes through a solution of salt X, it was found that 0..
Carboxylic acids and phenols can be separated by chemically active extraction if the pH of the aqueous layer is properly chosen. Phenols are sufficiently acidic to be extracted into aqueous sodium hydroxide
flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 10.0 mL of 0.220 M NaOH. 1. what volume of NaOH is needed to reach the end point of the titration?
Execute the following mathematical operations and express each answer in scientific notation with the correct number of significant
if you started a ride with ice packs that held 1600g of frozen water at 0 degree celius, and the temperature of the water at the end of the ride is 32 degree celius, How many calories of heat energy were absorb
a triprotic acid h3a has three ionization constants of ka1 8.7x10-3 ka2 1.9x10-8 and ka38.6x10-13 for the steps
at 25.0degc a sample of xe gas occupies 531 ml in a piston-cylider apparatus when the external pressure is 337 torr. at
Presume that we have a mixture of N2 (g) and O2 (g) of unknown composition whose total pressure is 385torr. If all the oxygen as is removed from the mixture by reaction with phosphorus, which doesn't react directly with nitrogen then the new press..
If i use 0.212 g of benzaldehyde, 1.6ml of a solution containing 58 mg of acetone in ethanol. what is my mols of benzaldehyde and what is the mols of acetone. how do i determine the moles for acetone if its ethanol.
What is the molar solubility of Mn(OH)2 in a solution that is buffered at pH 8.00
consider an excited-state hydrogen atom. What is the energy of the electron in the n = 3 level? ground state energy
Would a solution that has a molarity of 0.990 M KNO3 and a density of 0.988 g/mL be considered unsaturated, saturated, or supersaturated?
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