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Shooter A is more precise, but less accurate, while shooter B is more accurate, but less precise. 03 ϫ 104 40,300. 006 6. 17 kg FIGURE 1–41 A result with more significant digits than that of given data falsely implies more precision. Let’s analyze this simple example carefully. 34. 3601, as measured by a more accurate and precise instrument. 79066 to five significant digits. 80 is off by one digit in the second decimal place. 81421 to five significant digits. 80 is again off by one digit in the second decimal place.
25 kPa everywhere in the flow. Discussion Note that the vapor pressure increases with increasing temperature, and thus the risk of cavitation is greater at higher fluid temperatures. 2–4 ■ ENERGY AND SPECIFIC HEATS Energy can exist in numerous forms such as thermal, mechanical, kinetic, potential, electrical, magnetic, chemical, and nuclear, and their sum constitutes the total energy E (or e on a unit mass basis) of a system. The forms of energy related to the molecular structure of a system and the degree of the molecular activity are referred to as the microscopic energy.
This is known as the no-slip condition, which leads to the formation of boundary layers along solid surfaces. A system of fixed mass is called a closed system, and a system that involves mass transfer across its boundaries is called an open system or control volume. A large number of engineering problems involve mass flow in and out of a system and are therefore modeled as control volumes. In engineering calculations, it is important to pay particular attention to the units of the quantities to avoid errors caused by inconsistent units, and to follow a systematic approach.