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A rock weighs 20 N in air and 15 N when completely submerged in a fluid with a density of 800 kg/m3.   Determine the density of the rock.

Water enters a pipe of diameter 5 cm with a velocity of 4 m/s. Then the water encounters a constriction and its velocity becomes 16 m/s. What is the diameter of the constricted portion of the pipe?

A student does 1500 J of work while studying.  In the process, her internal energy decreases by 2600 J.  Determine the value of Q, including the algebraic sign.

What is the pressure difference between the street level and the roof of a 300 m high tower?  (Assume the density of air is 1.29 kg/m3 )

A student does 1290 J of work while studying.  In the process, her internal energy decreases by 2490 J.  Determine the value of Q, including the algebraic sign.

Figure 2.1 Using Figure 2.1, match the following:Tertiary (protein) structure.

Identify the organic compound/ macromolecule shown in this image.

Which level of organization is represented by an α-helix or β-pleated sheet?

Which substance was used as the control when testing for the presence of organic molecules?

Match the organic molecule with its description. Letters can be used more than once.