Un grup de cinci elevi, folosind aceeasi rigla gradata in milimetri, masoara lungimea manualului de fizica. Grupul a obtinut urmatoarele valori:28,8 cm;
28,7cm;29cm;28,9cm;29,1cm. Sa se calculeze:
a)lungimea medie a manualului;b)erorile de masurare;c)eroarea medie.

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3

Acommon technique in analysis of scientific data is normalization. the purpose of normalizing data is to eliminate irrelevant constants that can obscure the salient features of the data. the goal of this experiment is to test the hypothesis that the flux of light decreases as the square of the distance from the source. in this case, the absolute value of the voltage measured by the photometer is irrelevant; only the relative value conveys useful information. suppose that in part 2.2.2 of the experiment, students obtain a signal value of 162 mv at a distance of 4 cm and a value of 86 mv at a distance of 5.7 cm. normalize the students' data to the value obtained at 4 cm. (divide the signal value by 162.) then calculate the theoretically expected (normalized) value at 5.7 cm.

Which of the following is probably the least necessary character trait needed to be a good clinical nurse?