04/16/20

infinite series
2,1/2,5/4,7/8,17/16write a formula for the nth term
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04/15/20

Related rates problem, Find the velocity of the top of the ladder

A 20 ft ladder leans against a wall. The bottom of the ladder is 4 ft from the wall at time 𝑡=0 and slides away from the wall at a rate of 1ft/sec. Find the velocity of the top of the ladder at... more
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04/15/20

calculate the focal length of the lens
During the experiment student recorded that distance between object and the screen, on which image is observed, is 674 mm. Using the thin lens equation , calculate the focal length of the lens.... more
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04/15/20

You buy a used car for $6599. Its value decreases by 12% every year. What is the value of the car after five years? Round your answer to the nearest hundredth
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04/10/20

Suppose you roll 100 dice. What are the odds that 25 or more of them come up " 6 "?
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04/08/20

How fast must she let out the string when the kite is 500ft away from her?
A girl flies a kite at a height of 300 ft, the wind is carrying the kite horizontally away from her at a rate of 25ft/sec.
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04/08/20

Chemistry Question
When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced.2Al(s)+6HCl(aq)⟶2AlCl3(aq)+3H2(g)What volume of H2(g) is produced when 7.90 g Al(s) reacts at STP?volume of H2(g)... more
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04/08/20

Chemistry Question
A gaseous mixture contains 448.0 Torr H2(g), 381.1 Torr N2(g), and 90.7 Torr Ar(g). Calculate the mole fraction, χ, of each of these gases.χH2=χN2=χAr=
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04/04/20

Quadratic Trig Equations Help
Find all angles, 0° ≤ Θ ≤ 360°, that satisfy the equation below, to the nearest tenth of a degree. 9sin^2 Θ - 4 = 0
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04/04/20

Physics EM current
A square, 45-turn coil 10.0 cm on a side with a resistance of 0.720  is placed between the poles of a large electromagnet. The electromagnet produces a constant, uniform magnetic field of 0.600 T... more
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04/03/20

Calculate the Ksp of AgCN
If the concentration of CN1- is found to be 1.4 x 10-6 mol/L in a saturated solution ofAgCN, what is the Ksp of AgCN?
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03/29/20

Gravity and the Solar System
Calculate the density of a planet, in terms of the Earth's density p(sub E), if it is the same size as Earth but has a gravitational field strength that is 1.20 times that of Earth.
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03/26/20

What is the pressure in atm. of 18.4 g of CO2 in a 13.5 L container at 30.0oC
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03/26/20

Is it possible to calculate that X (known) Kg of SO2 = Y (solve) gallons of "typical" acid rain?
I need to create a mathematical equation to use in the interpretation of Life Cycle Assessment results. The LCA output is kg of SO2 (sulfur dioxide). My thought is X number of gallons of Acid Rain... more
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03/26/20

Problem B (SW) What Osmotic Pressure (Pi) can be generated by a 2M sugar solution at 16oC. (hint) use Pi = MRT change 16oC to K R = .08 L Atm/mol K

 Problem B (SW) What Osmotic Pressure (Pi) can be generated by a 2M sugar solution at 16oC.(hint) use   Pi = MRT    change 16oC to K    R = .08 L Atm/mol KYour answer should be greater that... more
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03/26/20

Find all (a) minors and (b) cofactors of the matrix. Then (c) expand by cofactors to find the determinant. Please show your work. It would help a lot. Thx
[ -6 4 -16 ][ -6 -4 12 ][ 2 -6 -12 ]
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03/26/20

Use Cramer’s Rule to solve the following system of linear equations. Find Dx, Dy, Dz, and determinant. Give the value of y.
4x - 3y + z = 296x + 9y - 2z = 63x - 2y + 4z = 31
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03/25/20

Find an equation of the tangent line to the graph of the function f(x)=x^2+3x+5 at point (-4,9)
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03/24/20

biomechanics - angular kinetics

Hanyu wants to become the first figure skater to land a quadruple axel (4.5 rotations). Nicknamed “The Projectile”, he figures that he must achieve a maximal height of 0.8m and have an angular... more
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03/24/20

Calculus Question
From a point level with the base of a water tower, the angle of elevation to the bottom of the water tank is 38° and to the top of the water tank is 47°. If the water tank itself is 20 feet high,... more
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03/24/20

Determine whether the geometric series ∑∞n=1 (4^(n−1))/9^n is convergent or divergent. If it is convergent, find its sum. Give reasons and show all your work.
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03/24/20

Please help mee
Please An IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of... more
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03/23/20

thanks for the help with chem
thanks for the help, i appreciate it 
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03/21/20

Assume that the random variable X is normally distributed with mean 70 and standard deviation 8. Find the 40th percentile for X.
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03/20/20

How many molecules of hydrogen are in 67.2L of H2 at STP?
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