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Julie Mendez

Julie M.

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David Collins verified

Numerade educator

This section presents several ways in which our day-to-day lives have been enriched by chemistry. List three materials or processes involving chemistry that you believe have contributed to such an enrichment, and explain your choices.

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Leon Druch verified

Numerade educator

A study was done to determine the age, number of times per week, and the duration (amount of time) of resident use of a local park in San Jose. The first house in the neighborhood around the park was selected randomly and then every 8th house in the neighborhood around the park was interviewed. “Number of times per week” is what type of data? a. qualitative b. quantitative discrete c. quantitative continuous

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Ashwin Banarsee verified

Numerade educator

(a) A world record was set for the men's 100-m dash in the 2008 Olympic Games in Beijing by Usain Bolt of Jamaica. Bolt “coasted” across the finish line with a time of 9.69 s. If we assume that Bolt accelerated for 3.00 s to reach his maximum speed, and maintained that speed for the rest of the race, calculate his maximum speed and his acceleration. (b) During the same Olympics, Bolt also set the world record in the 200-m dash with a time of 19.30 s. Using the same assumptions as for the 100-m dash, what was his maximum speed for this race?

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Leon Druch verified

Numerade educator

Horizontal Tangent At what point is the tangent to $f(x)=x^{2}+4 x-1$ horizontal?

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Umar Sohail Qureshi verified

Numerade educator

A light ray of wavelength 589 nm is incident at an angle $\theta$ on the top surface of a block of polystyrene surrounded by air, as shown in Figure P22.48. (a) Find the maximum value of $\theta$ for which the refracted ray will undergo total internal reflection at the left vertical face of the block. (b) Repeat the calculation for the case in which the polystyrene block is immersed in water. (c) What happens if the block is immersed in carbon disulfide?

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Jennifer Hudspeth verified

Numerade educator

Aluminum arsenide has the formula AlAs. a. What is the charge on the aluminum ion? b. What is the charge on the arsenic ion? c. Show that the charges on the ions add up to zero. d. What is the total number of valence electrons in all the atoms in AlAs?

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INSTANT ANSWER

Stress is applied to a 20 -in. steel bar that is clamped in a fixed position at each end. Let $Y=$ the distance from the left end at which the bar snaps. Suppose $Y / 20$ has a standard beta distribution with $E(Y)=10$ and $\operatorname{Var}(Y)=100 / 7$ (a) What are the parameters of the relevant standard beta distribution? (b) Compute $P(8 \leq Y \leq 12)$ . (c) Compute the probability that the bar snaps more than 2 in. from where you expect it to snap.

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Abigail Schammel verified

Numerade educator

SCIENTIFIC INQUIRY $\bullet$ DRAW IT Mosquitoes resistant to the pesticide DDT first appeared in India in $1959,$ but now are found throughout the world. (a) Graph the data in the table below. (b) Examine the graph, then hypothesize why the percentage of mosquitoes resistant to DDT rose rapidly. (c) Suggest an explanation for the global spread of DDT resistance.

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INSTANT ANSWER

A conservation group has claimed that the introduction of logging into a forest ecosystem will decrease the carrying capacity of trout living in a stream within the ecosystem. Describe data that could be used to either justify or refute this claim. Explain your reasoning. a. The growth rate of trout in the stream before and after logging will give an indication as to whether the claim is justified or not. b. Evaluate the death rate of trout in the stream after the introduction of logging, which will be used to justify or refute the claim. c. Collect data on number of trout in the stream after the introduction of logging, which will give an indication as to whether the claim is justified or not. d. Collect data on the number of trout in the stream before and after logging, which will give an indication as to whether the claim is justified or not.

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K Jagadeeswara Reddy verified

Numerade educator

You push an object of mass $m$ slowly, partway up a loop-the-loop track of radius $R,$ starting from the bottom, and ending at a height $h<R$ above the bottom. The coefficient of friction between the object and the track is a constant $\mu .$ Show that the work you do against friction is $\mu m g \sqrt{2 h R-h^{2}}$

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