Which organisms are the oldest to most recent, based on scientific views?
a.
cyanobacteria, birds, sea scorpion, saber-toothed cats
b.
birds, saber-toothed cats, sea scorpion, cyanobacteria
c.
cyanobacteria. sea scorpion, saber-toothed cats, birds
d.
cyanobacteria, sea scorpion, birds, saber-toothed cats

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?