You are given an unknown solid substance of mass 500 g and you want to estimate its specific heat. unfortunately, you don’t have a thermometer handy. instead, you throw the substance into a bucket of boiling water and wait until its in equilibrium with the boiling water. you then remove the hot substance from the boiling water and put it into a beaker with 400 ml ethyl alcohol at room temperature. immediately after adding the hot substance into the beaker, the volume scale reads 430 ml. after a while, when the alcohol and the substance reach equilibrium, the volume scale reads 429 ml.
What is the specific heat of the substance?
Hint: Assume that no heat was neither lost during the transfer nor to the environment. You can neglect the mass of the beaker. Room temperature is approximately 20 deg C and the density of ethyl alcohol is 789 kg/m^3.

A) 385 J/(mol K)
B) 4,057 J/mol K)
C) 2,090 J/(mol K)
D) 449 J/(mol K)
E) 7,500 J/(mol K)

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 frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience. b. report the adverse drug experience to the irb only if there are several other occurrences. c. report the adverse drug experience as part of the continuing review report. d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.