10/24/20

The length of a rectangle is four more than triple the width. If the perimeter is 96 inches, find the dimensions.
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10/24/20

Let α and β be first quadrant angles with cos ( α ) = √ 11 4 and sin ( β ) = √ 3 8 . Find sin ( α − β ) .
I need help with this question. I'm aware of the formula that I need to use. What I'm having trouble is working with the radicals. Can someone show me the process to work with them? Thank you
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10/24/20

What is the speed of the taxi at the top of a 6.00 m radius loop if the intially at rest start location was 32.4 m above the bottom of the loop?
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10/20/20

What is Potassium hydrogen phthalate?
a.      C8H5O4Kb.      Mono-potassium saltc.      The commonly used standard for acid-base titration.d.      None of the above
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10/20/20

finding the volume of the solid obtained by rotating the region bounded by the given curves

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.y=0,y=cos(7x),x=π/14,x=0 about the axis y=−8
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10/17/20

Calculate the angular velocity of the cylinder, in rad s-1 , to 2d.p.
A solid cylinder of mass 13 kg and radius 1.4 m is rolling without slipping along a horizontal road. The translational speed of the cylinder is 5.4 m s-1.
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10/12/20

Find y'' by implicit differentiation.
Find y'' by implicit differentiation.9x2 + y2 = 3y"=
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10/11/20

Probability of coins
There are 6 pennies, 4 nickels and 3 dimes in a wallet. Three coins are drawn at random without replacement.What is the probability 3 are pennies?What is the probability at least one is a penny?
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10/11/20

Starting downstream, 3.33 m away from a waterfall 0.287 m in height, at what minimum speed must a salmon jumping at an angle of 25.2 ◦ leave the water to continue upstream? Answer in units of m/s.
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10/08/20

Calculus HW question

Find an equation of the tangent line to the graph of the function at the given point. f(x)=(x+1/x-3)^2 ;(7,4)
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10/08/20

Vector functions - Determine maximum curvature
Determine the maximum curvature for the graph of ​f(x)=3ln(7x).The maximum curvature is ? at x= ?I need the maximum curvature and the x=?
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10/05/20

Chemistry plz help
A student was asked to formulate a hypothesis about what would happen if 100.mL of 0.1MNaOH(aq) at 25°C was combined with 100.mL of 0.1MMgCl2(aq) at 25°C . Which of the following hypotheses... more
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10/05/20

Chemistry question
Does reactivity for nonmetals increase or decrease as atomic radius increases? For example, Argon and Sulfur are both non metals. Sulfur has 16 protons and 6 electrons while Argon has 18 protons... more
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10/05/20

1D dynamics MRPS multisystem (Ramp)
A block (m1 = 6.8 kg) is being pulled up a ramp (at an angle = 27.4 degrees from the horizontal) with a cable that is parallel to the ramp's surface. The cable runs over a pulley that is at the top... more
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10/03/20

midpoint rule to aproximate the integral
Use the Midpoint Rule with n=4 to approximate the integral ∫√(x3+7) dx ≈from 2 to 10 
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10/03/20

Please verify answer...
At 12:00PM a FedEx truck is 100 miles east of a UPS truck. The FedEx truck is driving west at a 55 mi/h and the UPS truck is driving north at 75 mi/h. How fast is the distance between these trucks... more
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10/02/20

Suppose the position vector for a particle is given as a function of time...
by r(t) = x(t)î + y(t)ĵ, with x(t) = at + b and y(t) = ct2 + d, where a = 2.00 m/s, b = 1.30 m, c = 0.132 m/s2, and d = 1.20 m. (a) Calculate the average velocity during the time interval... more
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10/02/20

Please help with the power set!!!!
Which of the following is the power set of ? a.) 4b.)c.)d.)e.)     ?
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09/30/20

Sound in decibels is measured by comparing the sound intensity, I, to a benchmark sound I0 with intensity 10-16 watts/cm2. Then,
Noise level in decibels      = 10⁢  log⁢  (II0).Sound A measures 31 decibels and sound B is 8 times as loud as sound A. What is the decibel rating of sound B to the nearest integer?
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09/30/20

A true-false test contains 18 questions. In how many different ways can the 18-question test be answered?
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09/27/20

PHysics Projectile Motion
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 17 degrees below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are... more
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09/26/20

Buffers- Chemistry
A buffer is prepared by adding 12.0 g lactic acid (MW = 90.1 gmol-1), and 10.0 g sodium lactate (MW = 112 gmol-1), to enough water to form a 500 mL solution. The Ka of lactic acid is 1.38 x 10–4.a)... more
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09/22/20

Why is it that Cu, Ag, and Au have similar electron configurations, but Cu can be +1 or +2, Ag is +1 & Au can be +1 or +3?
I taught Chem and AP Chem in public HS for 23 years, and taught my kids enough about orbital notation to get the basics of how transition metals promote electrons into the d subshell. This... more
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09/22/20

What will be the acceleration of an Atwood machine with a frictional pulley with the following mass values?
What will be the acceleration of an Atwood machine with a frictional pulley with the following mass values?Pulley: 3.6 kg Mass A: 1.4 kg Mass B: 4.1 kg
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09/21/20

Why do you think scientists are so unwilling to entertain the belief in a "Designer"? Give an example of the irrationality depicted in origin of life research.
You have already learned about the Miller-Urey experiment and how it exaggerated its findings with regards to the origin of life, and yet many scientists still would rather entertain the idea that... more
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