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A soccer player kicks a rock horizontally off a 31.0 m high cliff into a pool of water. If the player hears the sound of the splash 3.4 seconds later, what was the initial speed given to the rock? Assume the speed of sound in air to be 343 m/s.
Explained the Millikan experiment oil drop
In the wake of the April 1986 accident at the Chernobyl nuclear power plant, large quantities of radioactive material rose over a kilometer from the force of the explosion and fire. The winds carried the β - -active cesium-137 isotope to Europe.
a) Write the nuclide degradation reaction.
b) Calculate the decomposition energy of cesium.
You’re traveling 45 km at 30o north east, then 98 km at 50o north west. What is your resultant displacement?
Ferric chloride, FeCl3, reacts with silver nitrate, AgNO3 to form ferric nitrate, Fe(NO3)3 and
silver chloride, AgCl.
a. Write the balanced chemical equation of the reaction.
b. If 108.5 moles of FeCl3 is combined with 76.8 moles of AgNO3, how many moles of
AgCl is produced?
c. How many grams of AgCl is produced?
d. Which reactant is the limiting reagent?
e. Which reactant is the excess reagent?
2 𝐴𝑙 + 2 𝑁𝑎𝑂𝐻 + 2𝐻2𝑂 → 2 𝑁𝑎𝐴𝑙𝑂2 + 3 𝐻2
If 126.4 g of NaOH is 97.7 g of Al are made to react,
a. How many moles of NaAlO2 is produced if 126.4 g of NaOH reactscompletely?
b. How many grams of NaAlO2 is produced using the same amount ofNaOH?
c. Which reactant is the limiting reagent?
d. How many grams of the excess reagent is left?
A 25 kg object with 3.0 m/s velocity travelling to the right hits object B, which has a mass of 15 kg and 6.0 m/s velocity moving and travelling to the left. After collision, determine the velocity of object A if object B:
a. Remains travelling to the left for 0.30 m/s.
b. Recoils to the right at 0.45 m/s, and c. Remains together with object A.
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Ball A with mass of 100 g moving in a constant velocity of 200 cm /s, hits Ball B with a mass of 400 g which is at rest. As a result of the collision, Ball A bounced back at 120 cm/s. determine the final velocity of Ball B.
An 8 kg bowling ball is at rest and a 5 kg bowling ball rolls towards it. Upon collision, the heavier ball moves with a velocity of 3 m/s and a lighter ball stops moving. What is the velocity of the lighter ball before collision?
1. A 30g marble rolls with a velocity of 2 m/s toward a 70 g marble at rest. The lighter marble(m1) stops moving as it hits the heavier marble(m2). This collision causes the heavier marble to move. What is the velocity of the heavier marble?
