 # Free solutions on any math topic

Recent questions in Other f480forever2rz 2021-11-24 Answered

### For a lead-tin alloy of composition 80 wt Sn–20 wt Pb and at $$\displaystyle{180}^{\circ}{C}{\left({335}^{\circ}{F}\right)}$$, do the following: a) Determine the mass fractions the $$\displaystyle\alpha$$ and $$\displaystyle\beta$$ phases. b) Determine the mass fractions of primary $$\displaystyle\beta$$ and eutectic microconstituents. c) Determine the mass fraction of eutectic $$\displaystyle\beta$$ f480forever2rz 2021-11-24 Answered

### Determine whether f is a function from Z to R if a) $$\displaystyle{f{{\left({n}\right)}}}=\pm{n}$$. b) $$\displaystyle{f{{\left({n}\right)}}}=\sqrt{{{n}^{{2}}+{1}}}$$. c) $$\displaystyle{f{{\left({n}\right)}}}={\frac{{{1}}}{{{n}^{{2}}−{4}}}}$$. adOrmaPem6r 2021-11-24 Answered

### Find three positive numbers whose sum is 12 and the sum of whose squares is as small as possible. kenziebabyyy4e 2021-11-24 Answered

### The energy flow to the earth from sunlight is about $$\displaystyle{1.4}{k}\frac{{W}}{{m}^{{{2}}}}$$ . (a) Find the maximum values of the electric and magnetic fields for a sinusoidal wave of this intensity. (b) The distance from the earth to the sun is about $$\displaystyle{1.5}\times{10}^{{{11}}}{m}$$. Find the total power radiated by the sun. TokNeekCepTdh 2021-11-24 Answered

### How many joules of energy does a 100-watt light bulb use per hour? How fast would a 70-kg person have to run to have that amount of kinetic energy? vadulgattp 2021-11-24 Answered

### Identify the precipitate (if any) that forms when the following solutions are mixed, and write a balanced equation for each reaction. KOH and $$\displaystyle{C}{u}{\left({N}{O}_{{{3}}}\right)}_{{{2}}}$$ Lloyd Allen 2021-11-24 Answered

### Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent? Arrange the substances with polar covalent bonds in order of increasing bond polarity: (a) KCl, (b) $$\displaystyle{P}_{{{4}}}$$, (c) $$\displaystyle{B}{F}_{{{3}}}$$, (d) $$\displaystyle{S}{O}_{{{2}}}$$, (e) $$\displaystyle{B}{r}_{{{2}}}$$, (f) $$\displaystyle{N}{O}_{{{2}}}$$ Charles Cisneros 2021-11-23 Answered

### A flowerpot falls off a windowsill and passes the window of the story below. Ignore air resistance. It takes the pot 0.380 s to pass from the top to the bottom of this window, which is 1.90 m high. How far is the top of the window below the windowsill from which the flowerpot fell? luipieduq3 2021-11-23 Answered

### List the first five terms of the sequence. $$\displaystyle{a}_{{1}}={6},{a}_{{n}}+{1}=\frac{{a}_{{n}}}{{n}}$$ protisvitfc 2021-11-23 Answered

### A man 6 feet tall walks at a rate of 5 feet per second away from a light that is 15 feet above the ground. (a) When he is 10 feet from the base of the light, at what rate is the tip of his shadow moving? (b) When he is 10 feet from the base of the light, at what rate is the length of his shadow changing? oppvarmet16 2021-11-23 Answered

### For 589-nm light, calculate the critical angle for the following materials surrounded by air: (a) cubic zirconia, (b) flint glass, and (c) ice kursval7z 2021-11-23 Answered

### A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m=0.100 fg (where a femtogram, fg, is $$\displaystyle{10}^{{-{15}}}$$ g) and is swimming at a velocity of v=1.00um/s, with an uncertainty in the velocity of 5.00%. E. coli bacterial cells are around 1 um ($$\displaystyle{10}^{{-{6}}}$$ m) in length. The student is supposed to observe the bacterium and make a drawing. However, the student, having just learned about the Heisenberg uncertainty principle in physics class, complains that she cannot make the drawing. She claims that the uncertainty of the bacterium's position is greater than the microscope's viewing field, and the bacterium is thus impossible to locate. What is the uncertainty of the position of the bacterium? luipieduq3 2021-11-23 Answered

### How do you solve $$\displaystyle{d}={\frac{{{1}}}{{{2}}}}{a}{t}^{{2}}$$? enfurezca3x 2021-11-23 Answered

### If a proton and an electron are released when they are $$\displaystyle{2.0}\times{10}^{{-{10}}}{m}$$ apart (a typical atomic distance), find the initial acceleration of each particle. Monincbh 2021-11-23 Answered

### At the surface of Jupiter's moon lo, the acceleration due to gravity is $$\displaystyle{g}={1.81}\frac{{m}}{{s}^{{{2}}}}$$. A watermelon weighs 44.0 N at the surface of the earth. (a) What is the watermelon's mass on the earth's surface? (b) What would be its mass and weight on the surface of lo? smellmovinglz 2021-11-23 Answered

### The mass of Venus is 81.5% that of the earth, and its radius is 94.9% that of the earth. (a) Compute the acceleration due to gravity on the surface of Venus from these data. (b) If a rock weighs 75.0 N on earth, what would it weigh at the surface of Venuse? inlays85k5 2021-11-23 Answered

### The current in a 50 mH inducator is known to be $$\displaystyle{i}={120}{m}{A},{t}\le{0};$$ $$\displaystyle{i}={A}{1}{e}^{{-{500}{t}}}+{A}{2}{e}^{{-{2000}{t}}}{A},{t}\geq{0}$$. The voltage across the inducator (passive sign convention) is 3 V at $$\displaystyle{t}={0}$$. a) Find the expression for the voltage across the inducator for $$\displaystyle{t}{>}{0}$$. b) Find the time, greater then zero, when the power at the terminals of the inductor is zero. Maaghu 2021-11-23 Answered

### A proton is placed in a uniform electric field of $$\displaystyle{2.75}\times{10}^{{{3}}}{\frac{{{N}}}{{{C}}}}$$ Calculate: a) the magnitude of the electric force felt by the proton b) the proton’s acceleration; c) the proton’s speed after $$\displaystyle{1.00}\mu{s}$$ in the field, assuming it starts from rest. Clifton Sanchez 2021-11-22 Answered

### Each side of a square is increasing at a rate of 6 cm/s . At what rate is the area of the square increasing when the area of the square is $$\displaystyle{16}\ {c}{m}^{{2}}$$ ? rabbitz42z8 2021-11-22 Answered

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