The density of an object can be calculated using the formula Density = Mass/Volume.
Experimental Density:
Density = 153.8g / 20.00 cm^3
Density = 7.69g/cm^3
Percent error equation:
% Error = | Theoretical Value - Experimental Value|/Theoretical Value * 100
% Error = | 7.87g/cm^3 - 7.69g/cm^3|/7.87g/cm^3 * 100
% Error = 2.29%
Therefore a is the correct answer.
Ignoring air resistance . . .
-- Gravity adds 9.8 m/s to the speed of a falling object every second.
-- After falling for 3 sec, it's falling (3 x 9.8) = 29.4 m/s faster
than it was when it was dropped.
-- It started out with zero speed when it rolled off the top of the building,
so its speed is 29.4 m/s after 3 seconds.
-- Its average speed all the way down is
(1/2) (0 + 29.4) = 14.7 m/s .
-- After traveling for 3 sec at an average speed of 14.7 m/s,
it has traveled
(3 sec) x (14.7 m/s) = 44.1 meters .
Answer:
Black Flies, leeches and aquatic worms.
Explanation:
Black Flies, leeches and aquatic worms are the organisms that are tolerant to pollution and has the ability to survive in the polluted environment occur due to man-made waste. these organisms sometimes takes food from these pollutants and help in surviving these organisms. Without these tolerant organisms, those organisms which are not sensitive to these pollutants will die and removed from that polluted environment.
