Questions by MathsGee

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asked 4 hours ago in Physics | 2 views

A ray of light strikes from a medium $(n = 1.67)$ on a surface of separation with the air $(n = 1)$. It calculates the limit or critical angle.

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asked 4 hours ago in Physics | 2 views

What must be the angle of incidence for there to be total internal reflection of a ray going from water $(n_w = 1.3)$ to glass $( n_g = 1.52)$?

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asked 5 hours ago in Physics | 2 views

What is the formula for predicting the critical angle (angle of incidence that provides an angle of refraction of 90-degrees)?

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asked 1 day ago in Physics | 5 views

When comparing systematic and random errors, the following pairs of properties of errors in an experimental measurement may be contrasted:

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asked 1 day ago in Physics | 5 views

In a simple electrical circuit, the current in a resistor is measured as $(2.50 \pm 0.05) mA$. The resistor is marked as having a value of $4.7\Omega \pm 2\%$

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asked 1 day ago in Physics | 5 views

An Olympic athlete of mass $80kg$ competes in a race. What is the best estimate of his kinetic energy during the race?

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asked 1 day ago in Physics | 5 views

A metal sphere of radius $r$ is dropped into a tank of water. As it sinks at speed $v$, it experiences a drag force $F$ given by $F=krv$, where $k$ is a constant. What are the SI units of $k$?

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asked 1 day ago in Physics | 6 views

A student makes measurements from which she calculates the speed of sound as $327.66 ms^{-1}$. She estimates that her result is accurate to $\pm 3\%$.

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asked 1 day ago in Physics | 5 views

A micrometer reading to $0.01mm$, gives the following results when used to measure the diameter $d$ of a uniform wire

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asked 2 days ago in Mathematics | 5 views

What is the value of $f(n)$ when $n=16$?

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asked 2 days ago in Mathematics | 8 views

How do you prove that every well-ordered set is isomorphic to a unique ordinal number?

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asked 2 days ago in Mathematics | 6 views

If I divide, add, subtract, or multiply a number with a repeating decimal is the answer always going to have a repeating decimal?

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asked 2 days ago in Mathematics | 7 views

Given: Right Triangle PQR , with acute angles P and R. Which statement is NOT true?

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asked 2 days ago in Mathematics | 6 views

Evaluate $\lim_{x \rightarrow -\infty}\dfrac{1}{2x^3}$

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asked 2 days ago in Mathematics | 5 views

Find the two $x$ values at which the tangent line to the curve $y=\dfrac{x+3}{x+2}$ is perpendicular to the line $y=x$

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asked 2 days ago in Mathematics | 5 views

An ant colony is multiplying inside a plate. The number of ants increases at a rate of $10e^t$ per hour. Find the net increment of ant population after 24hrs?

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asked 2 days ago in Physics | 6 views

The password is 3 digits long, and each digit could be a number between 0 and 5. The probability of guessing the password on the first try?

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asked 2 days ago in Physics | 5 views

Find the percent of change from 128 to 112?

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asked 2 days ago in Physics | 5 views

How many Kilowatt- hours are used by a 250W bulb burning for 8 Hours?

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asked 2 days ago in Mathematics | 5 views

Determine the derivative of $ y=\left(\dfrac{x^2-3}{x^2+3}\right)^4$ by using two different methods

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asked 2 days ago in Mathematics | 5 views

Scores on BMCC fall 2017 MAT150.5 department final exam form a normal distribution with a mean of 70 and a standard deviation of 8. What percent of the population has the following?

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asked 2 days ago in Mathematics | 5 views

Find the projection of $u = <3,-12>$ onto $v = <9,2>$

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asked 2 days ago in Mathematics | 5 views

Find the dot product of $u = <-5,-6,-2>$ and $v = <-3,10,8>$. Are $u$ and $v$ orthogonal?

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asked 2 days ago in Mathematics | 5 views

Suppose you have a function to which you apply L’Hospital’s rule and the result is still in the form 0/0 or infin/infin what can you do?

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asked 2 days ago in Mathematics | 5 views

A cube has an edge length of 18m. What is its volume, in cubic m?

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asked 2 days ago in Mathematics | 5 views

how to find the area of a circle with circumference of 12cm?

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asked 2 days ago in Mathematics | 5 views

Solve the equation $\sin{(x+3)}=\sin{x}$, $0 \leq x \leq 2\pi$ to 4 decimal places. What is the product of the two solutions?

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asked 2 days ago in Mathematics | 5 views

Find the value of $A$ using the formula $A = Pe^{rt}$ given the following values of $P, r$ and $t$. Round to the nearest hundredth.

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asked 2 days ago in Mathematics | 5 views

Round 475,695 to the nearest thousand

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asked 2 days ago in Mathematics | 5 views

Solve the trigonometric equation $2\cos{(\dfrac{3}{10}x)} - 3\sin{(\dfrac{1}{2}x)}=0$

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asked 2 days ago in Mathematics | 6 views

What percent of $897.77$ is $84.95$?

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asked 2 days ago in Mathematics | 6 views

If 2 => 6, 3 =>12, 4 => 20, 5 => 30, 6 => 42 then 9 => ?

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asked 2 days ago in Library & Clubs | 9 views

A classroom wall is 750 cm long. Calculate how many tables, each 120 cm long,will fit along the wall and hence, determine how much space will be left over.

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asked 2 days ago in Digital Marketing | 5 views

Why is Yahoo Answers shutting down?

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asked Apr 11 in General Knowledge | 7 views

What are the common typos when people search for MathsGee on the search engines?

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asked Apr 10 in Data Science | 8 views

Is online experimentation necessarily better than instinct-driven/informed decision making for online businesses?

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asked Apr 10 in EdTech | 8 views

How can institutions leverage digital courseware to gain actionable data to help students?

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asked Apr 10 in Data Science | 40 views

How is Facebook using Bayesian Optimization with BoTorch?

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asked Apr 10 in Digital Marketing | 5 views

Does changing dates on my website's existing pages improve my search engine rankings?

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asked Apr 9 in Mathematics | 8 views

Jack and Thembile live 6 473 m apart. Convert this distance to km.

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asked Apr 9 in Mathematics | 7 views

In Sweden a daytime temperature of $1^{\circ}C$ can drop by $16$ degrees during the night. What will the temperature be then?

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asked Apr 9 in Mathematics | 8 views

When do we use negative numbers in life?

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asked Apr 8 in Mathematics | 8 views

How do I know if two straight lines are parallel?

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asked Apr 8 in Entrepreneurship | 7 views

When did the Pick n Pay franchise business start?

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asked Apr 8 in Mathematics | 8 views

If B is 4, C is 9 and D is 16. Find the sum A+C+E?

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asked Apr 7 in Mathematics | 6 views

A store ordered 750 candles a total wholesale cost of $7910.20. The soy candles cost \$12.17 each and the specialty candles cost \$9.58 each. How many of each were bought?

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asked Apr 6 in Mathematics | 8 views

Solve the exponential equation for $x: e^{x - 4} e^{2x + 9} = 14$

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asked Apr 6 in Data Science | 44 views

Is there a way to grasp the correct causal structure on the basis of observation and without presupposing dispensable causal knowledge?

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asked Apr 5 in Data Science | 7 views

How can I compute counterfactuals, given a parametric model for the structural equation for the outcome?

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asked Apr 5 in Data Science | 5 views

So counterfactual is considered a disjoint set of CATE, rather than a subset?