# UVA Mathematics Department 1310/1320 Diagnostic

This diagnostic is designed to provide feedback to a) help you decide the best course to start in and b) how we can best support your learning. Some suggestions:

• The diagnostic is self-paced. You will want to set aside enough time to work through each of the 10 questions in one sitting.
• Please refrain from using calculators as you will not be able to do so when taking exams in our courses.
• This diagnostic will not confer academic credit, so relax and do your best!

1. Find the derivative of $$f(x) = \frac{ \sin^2 x}{\sqrt{1+x^2}}$$. Do not simplify your answer.

2. If $$f(9) = 1, f'(9) = 3, g(1) = 0, g'(1) = -2$$, and $$h(x) = x^{3/2} e^{g(f(x))}$$, then what is $$h'(9)$$?  Simplify your answer.

3. Below is a portion of the graph of a function $$f$$.

For the following, give all values of $$a$$ in the interval $$(-5,4)$$ satisfying the given condition. If there are none, write "none". No work is required.

(a) all $$a$$ not in the domain of $$f$$:

(b) all $$a$$ such that $$f$$ is not continuous at $$a$$:

(c) all $$a$$ such that  $$\displaystyle \lim_{x \rightarrow a}f(x)$$ does not exist:

(d)  all $$a$$ at which $$f$$ is not differentiable:

4. Find and classify the critical numbers of $$f(x) =x^{4/5}(x-4)^2$$, indicating for each critical number whether it yields a local maximum value of $$f$$, a local minimum value, or neither.

5.  Find the area of the region bounded by the curves $$y = x^2$$ and $$y =x + 2$$.

6.  A canister is dropped from a helicopter 500 m above the ground. Its parachute does not open, but the canister has been designed to withstand an impact speed of 120 m/s. Will it burst? Assume that after it is dropped, the canister experiences (only) the acceleration due to gravity, approximately 10 m/s$$^2$$.

7.  Find $$\displaystyle{ \int \frac{e^x}{1+e^x} \, dx}$$.

8.   Evaluate   $$\displaystyle{\int_0^{\pi/12} \tan^3(3x)\sec^2(3x)\, dx}$$.

9. Over the time interval $$1 \le t \le 100$$ the temperature of a freezer compartment is given by

$$f(t) = \frac{t - 4}{t^2}$$,

where $$t$$ is measured in hours and $$f(t)$$ is measured in degrees Celsius.
What's the maximum temperature of the freezer over this time interval?

10. Both Rugby Road and Madison Lane meet University Avenue at right angles. (See the diagram below.)  Dolly is biking on University Ave at 9 ft/sec and has passed Madison Ln heading toward Rugby. James is biking away from University Ave along Rugby traveling at 8 ft/sec.  At what rate is  the distance between Dolly and James changing at the instant when James is 40 ft from and Dolly is 30 ft from the intersection of Rugby Rd and University Ave?   Is the distance between them increasing or decreasing at this instant?