Mindblown: a blog about philosophy.

Skydivers jump from a plane at intervals of a few seconds. If two divers wish to join up as they fall, the second must catch up with the first. a If one diver is more massive than the other, which should jump first? Use the idea of forces and terminal velocity to explain your answer.…

Use the idea of inertia to explain why some large cars have power-assisted brakes.

The pull of the Earth’s gravity on an apple (its weight) is about 1 newton. We could devise a new international system of units by defining our unit of force as the weight of an apple. State as many reasons as you can why this would not be a very useful definition.

A train is travelling at 50 m s−1 when the driver applies the brakes and gives the train a constant deceleration of magnitude 0.50 m s−2 for 100 s. Describe what happens to the train. Calculate the distance travelled by the train in 100 s.

A motorway designer can assume that cars approaching a motorway enter a slip road with a velocity of 10 m s−1 and reach a velocity of 30 m s−1 before joining the motorway. Calculate the minimum length for the slip road, assuming that vehicles have an acceleration of 4.0 m s−2.

The active ingredient in aspirin is acetylsalicylic acid. A 2.51-g sample of acetylsalicylic acid required 27.36 mL of 0.5106 M NaOH for complete reaction. Addition of 13.68 mL of 0.5106 M HCl to the flask containing the aspirin and the sodium hydroxide produced a mixture with Find the molar mass of acetylsalicylic acid and its…

A. Precipitation reaction B. Double displacement reaction C. Combination reaction D. Redox reaction Answer:- A. Precipitation reaction and, B. Double displacement reaction This is an instance of a double displacement reaction. The silver nitrate and sodium chloride are neutral solutions, they form a white precipitate and a colorless solution. The silver moves sodium from the solution…

Calculate the final concentrations of K(aq), C2O4 2(aq), Ba2(aq), and Br(aq) in a solution prepared by adding 0.100 L of 0.200 M K2C2O4 to 0.150 L of 0.250 M BaBr2. (For BaC2O4, Ksp 2.3  108 .)

Answer:- The solubility of solid Ce (IO3)3 in a 0.20M KIO3 solution is 3.52 x 10-10mol/L. There is the surge in the concentration of the ion in the presence of 0.20 M KIO3 solution.

Calculate the solubility of solid Ca3(PO4)2 (Ksp 1.3  1032) in a 0.20 M Na3PO4 solution.