试题来源: 解析 B。本题考查密度公式的英语表达。ρ表示密度(density),m 表示质量(mass),V 表示体积(volume),密度的计算公式是 ρ = m/V。A 选项是质量等于密度乘以体积;C 选项是体积等于质量除以密度;D 选项是力等于质量乘以加速度。反馈 收藏
densitymetalatomic.structureparameterBased on the consideration onmass and volume ofone atom.a nem formula for calculatingthe densilv ofsimple metal substance from their atomic structure parameters is estabhshed.The densities of66 metals in the periodic table were calculated from this formula Tha cal...
Power densities, total performance degradation and the degradation rate of DLC1 and DLC2 are tabulated in Table4. The formula used for calculating the degradation rate is given in Eq. (4). Table 4 Performance degradation of fuel cell operated under dynamic load conditions. Full size table $$R...
The empirical formula for calculating the complex effective permittivity of an aqueous electrolyte solution at microwave frequency 来自 Semantic Scholar 喜欢 0 阅读量: 75 作者:X Yang,K Huang 摘要: So far, some models have been established to calculate the complex effective permittivity of an aqueous...
We documented the validity of ME for calculating leaf area at a species level, a genus level, and even for the 6-species pooled data set. The estimated Montgomery parameter (i.e., the proportional coefficient in ME) is approximately equal to 0.68, which means that leaf area of the six ...
Overall, the proposed framework has great potential for practical applications in ecological and environmental scientific research, as well as agricultural water resource management. Our study revealed that topographic factors such as slope and aspect, as well as soil attributes such as silt and sand ...
For the vertex coordinates (𝑥1,𝑦1), (𝑥2,𝑦2), ⋯, (𝑥𝑖,𝑦𝑖), ⋯, (𝑥𝑛,𝑦𝑛)(x1,y1), (x2,y2), ⋯, (xi,yi), ⋯, (xn,yn), the formula for calculating the concave hull area is: 𝑆=12∑𝑖=1𝑛−1(𝑦𝑖+𝑦𝑖+1)(𝑥𝑖−...
Calculating the Present Value of an Annuity Due Similarly, the formula for calculating the PV of an annuity due takes into account the fact that payments are made at the beginning rather than the end of each period. For example, you could use this formula to calculate the PV of your fu...
The utilization of mechanical ventilation is of utmost importance in the management of individuals afflicted with severe pulmonary conditions. During periods of a pandemic, it becomes imperative to build ventilators that possess the capability to autonom
A Comparison of Two Formula Types for Calculating Long-Wave Radiation From the Atmosphere 来自 Semantic Scholar 喜欢 0 阅读量: 27 作者:JK Aase,SB Idso 摘要: Measurements of long-wave radiation at Sidney, Montana, indicated that both an analytically derived equation and an empirically derived ...