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# Answer: The wooden table is made from a square board

ISBN: 9780133918922 126

## Solution for problem 9-78 Chapter 9

Engineering Mechanics: Statics | 14th Edition

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Engineering Mechanics: Statics | 14th Edition

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Problem 9-78

The wooden table is made from a square board having a weight of 15 lb. Each of the legs weighs 2 lb and is 3 ft long. Determine how high its center of gravity is from the floor. Also, what is the angle, measured from the horizontal, through which its top surface can be tilted on two of its legs before it begins to overturn? Neglect the thickness of each leg. 4 ft 3 ft 4 ft Prob. 978

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Study Guide for Midterm #2 Bio 151 RNA World Hypothesis -RNA system that replicates in two steps 1. Self replicating RNA 2. RNA acted as a template for forming 3. Proteins then aid in replication of RNA 4. Make DNA from RNA for storage of info -Problems: Clutter with other molecules, efficiency of ribozyme Prokaryotes most likely came before Eukaryotes -Prokaryotes infolding of membrane to make nucleus Endosymbiont: theory for semiautonomous organelles -organisms living together in direct and intimate contact -mitochondria and chloroplasts both contain small amounts of circular DNA Nucleus: contains chromatin and nucleolus -chromatin: strands of chromosomes -nucleolus: sit of rRNA synthesis, assembly of large and small ribosomal subunits -nuclear envelope: 2 lipid bilayers -inner and outer nuclear envelopes perforated by nuclear pores Movement of vesicles: by being attached to elements of cytoskeleton: intracellular rods and fibers that support cells or by motor proteins Microtubules: thickest -helical polymer made of individual dimers of a and b tubulin proteins -can be stable girders, but also move things -push or pull, move things using attached motor proteins -sliding, move cilia and flagella -cilia and flagella contain m.t. organized into ring, pairs connected by dynein -basal body: specialized centriole at base of every cilium or flagellum Endosome: membrane wrapped vesicle Centrosome: microtubule organizing center Microfilaments: finest -double helix made of actin proteins -shortened or lengthened by removal or addition of actin -slide using motor proteins like myosin Intermediate filaments: middle -structural meshwork to shape -coat proteins help shape and traffic membranes Prokaryotic cell division -fission, one circular chromosome replicates then splits Chromatid: 1 DNA double helix, two sisters connected by centromere Chromosome: depends on number of DNA double helix Mitotic spindle: arranges and moves chromosomes Mitosis: phases -interphase: duplicating chromosomes -prophase: two of each -metaphase: line up -anaphase: separate -telophase: two new cells Kinetochore: proteins surrounding centromere control movement Cytokinesis: subdivision of the cytoplasm into two cells -animal cells: cleavage furrow -Plant: cell plate Cell cycle -G1 between m and s -S: dna replication -G2: between s amd m -M: mitosis/division Checkpoints -G1: cell large enough, nutrients, signals -G2: happy, dna duplicated -M: chromosomes attached to cytoskeleton for movement MPF: complex of two proteins that drives cell through g2 check point -CDK to create active MPF Meiosis: makes half the number of chromosomes -makes gametes, diploid (2n) into haploid (1n) -Homologues: can have same genes but different versions -Meiosis I: meiotic spindle lines up homologous chromosomes next to each other, separates, sister chromatids stay together -crossing over may happen at chiasma -II: halves amount of DNA, sisters separate Phenotype: physical trait individual has Genotype: genetic info that is passed Homozygous: alleles on both genes are identical (AA or aa) Heterozygous: alleles are different (Aa) Dominant control, recessive only if both alleles Mendel’s Law of Segregation: the two alleles in the parent segregate from each other during formation of gametes Incomplete dominance: heterozygote has phenotype that is intermediate between that of homozygotes Codominance: different alleles give difference dominance traits so both show There can be sex-linked complication Nondisjunction: errors of chromosome separation during meiosis One gene is silenced Respiration 1. Glycolysis: only in cytoplasm, 6 C glucose lysed into 2 3C pyruvates gets 2ATP and high energy e-, 2NADH 2. Intermediate Cycle 3. Krebs Cycle: pyruvates enter in mitochondrial matrix, broken into CO2, get 2 ATP 4. Oxidative Phosphorylation: mitochondrial membrane, high energy e- + O 2 ATP -need a pool of NAD+

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Answer: The wooden table is made from a square board