This problem has been solved!
see the answer
a 4.00 cm x 4.00 cm x 4.00 cm cube of density 950 kg/m^3 is floating at rest at the top of a beaker of cross sectional area 100 cm^2 with 500 ml of water in it (1 ml of water has a volume of 1 cm^3 or 1x10^-6 m^3). 400 ml of oil of density 900 kg/m^3 is added to the top of the beaker, and the cube is observed to float completely submerged, straddling in the boundary between the oil and the water. determine the following:
a. the buoyant force on the block?
b. the volume of the block that is underwater?
c. what is het depth of the water layer and of the oil?
d. what is the force that the water pressure exerts on the bottom of the beaker? (how does this compare with the total weight of the beakers contents? )
the answers should be f= 0.5958 n, v water = 3.20 x 10%-5 m^3, depth water = 5.32 cm and depth oil = 4.32 cm, and f bottom = 0.90238 n
solve all four parts (a, b,c, and d) of the question! in advance!

Natural forces that can alter ecosystems include seasons and climate changes. t or f

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error