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Wesley Anderson

Wesley A.

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Questions asked

INSTANT ANSWER

When concentrations of formaldehyde in the air exceed $33 \mu \mathrm{g} / \mathrm{ft}^{3}\left(1 \mu \mathrm{g}=1 \text { microgram }=10^{-6} \mathrm{gram}\right),$ a strong odor and imitation to the eyes often occurs. One square foot of handwood plywood paneling can emit $3365 \mu \mathrm{g}$ of formaldehyde per day. (Source: Hines, A... T. Ghosh, S. Loyalka, and R. Warder, Indoor Air: Quality \& Control, Prentice-Hall, $1993 .$ ) A 4 -ft by 8 -ft sheet of this paneling is attached to an $8-1$ wall in a room having floor dimensions of $10 \mathrm{ft}$ by $10 \mathrm{ft}$. (a) How many cubic feet of air are there in the room? (b) Find the total number of micrograms of formaldehyde that are released into the air by the paneling cach day. (c) If there is no ventilation in the room, write a linear equation that models the amount of formaldehyde $F$ in the room after $x$ days. (d) How long will it take before a person's eyes become irritated in the room?

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ANSWERED

Rabia Shuaib verified

Numerade educator

The reaction $2 \mathrm{ClO}_{2}(a q)+2 \mathrm{OH}^{-}(a q) \longrightarrow \mathrm{ClO}_{3}^{-}(a q)+$$\mathrm{ClO}_{2}^{-}(a q)+\mathrm{H}_{2} \mathrm{O}(l)$ was studied with the following results:(a) Determine the rate law for the reaction. (b) Calculate the rate constant with proper units. (c) Calculate the rate when $\left[\mathrm{ClO}_{2}\right]=0.100 \mathrm{M}$ and $\left[\mathrm{OH}^{-}\right]=0.050 \mathrm{M}$

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ANSWERED

Darshan Maheshwari verified

Numerade educator

The power rating of a light bulb (such as a 100-W bulb) is the power it dissipates when connected across a 120-V potential difference. What is the resistance of (a) a 100-W bulb and (b) a 60-W bulb? (c) How much current does each bulb draw in normal use?

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ANSWERED

David Mccaslin verified

Numerade educator

How much water must Poison Ivy add to a 4-liter solution that contains $5 \%$ extract of baneberry to get a solution that contains $3 \%$ extract of baneberry?

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ANSWERED

Leon Druch verified

Numerade educator

Agency Cases An investigative agency has 7 cases and 5 agents. How many different ways can the cases be assigned if only 1 case is assigned to each agent?

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ANSWERED

David Collins verified

Numerade educator

Cooking List physical properties of eggs before and after they are cooked. Based on your observations, does a physical change or chemical change occur when eggs are cooked? Justify your answer.

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INSTANT ANSWER

Suppose that point $P$ is on a circle with radius $r,$ and ray OP is rotating with angular speed $\omega .$ Use the given values of $r, \omega,$ and $t$ to do the following. See Example 1 . (a) Find the angle generated by $P$ in time $t$. (b) Find the distance traveled by $P$ along the circle in time $t$. (c) Find the linear speed of $P$. $$r=20 \mathrm{cm}, \omega=\frac{\pi}{12} \text { radian per sec, } t=6 \mathrm{sec}$$

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ANSWERED

Umar Sohail Qureshi verified

Numerade educator

What do they measure? For each of the following summary statistics, decide (i) whether it could be used to measure center or spread and (ii) whether it is resistant. (a) $\frac{Q_{1}+Q_{3}}{2} \quad$ (b) $\frac{\operatorname{Max}-\text { Min }}{2}$

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INSTANT ANSWER

Draw the enol form of each keto tautomer in parts (a) and (b), and the keto form of each enol tautomer in parts (c) and (d).

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ANSWERED

Umar Sohail Qureshi verified

Numerade educator

A string with both ends held fixed is vibrating in its third harmonic. The waves have a speed of 192 m/s and a frequency of 240 Hz. The amplitude of the standing wave at an antinode is 0.400 cm. (a) Calculate the amplitude at points on the string a distance of (i) 40.0 cm; (ii) 20.0 cm; and (iii) 10.0 cm from the left end of the string. (b) At each point in part (a), how much time does it take the string to go from its largest upward displacement to its largest downward displacement? (c) Calculate the maximum transverse velocity and the maximum transverse acceleration of the string at each of the points in part (a).

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