Numerade

Questions asked

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Tracy Tourville

Numerade educator

A 275-mL flask contains pure helium at a pressure of 752 torr. Asecond flask with a volume of 475 mL contains pure argon at a pressure of 722 torr. If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of each gas and the total pressure?

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Babita Kumari

Numerade educator

An airplane is heading north at an airspeed of 500 km/hr, but there is a wind blowing from the northwest at 50 km/hr. How many degrees off course will the plane end up flying, and what is the plane’s speed relative to the ground?

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Paul Gabriel

Numerade educator

A person driving her car at 45 $\mathrm{km} / \mathrm{h}$ approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 28 $\mathrm{m}$ away from the near side of the intersection (Fig. 51). Should she try to stop, or should she speed up to cross the intersection before the light turns red? The intersection is 15 $\mathrm{m}$ wide. Her car's maximum deceleration is $-5.8 \mathrm{m} / \mathrm{s}^{2}$ whereas it can accelerate from 45 $\mathrm{km} / \mathrm{h}$ to 65 $\mathrm{km} / \mathrm{h}$ in 6.0 $\mathrm{s}$ . Ignore the length of her car and her reaction time.

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Satyam Gupta

Numerade educator

The Base Sequence in the Two Polynucleotide Chains of a DNA Double Helix Is Complementary Adhering to the convention of writing nucleotide sequences in the $5^{\prime} \rightarrow 3^{\prime}$ direction, what is the nucleotide sequence of the DNA strand that is complementary to d-ATCGCAACTGTCACTA?

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INSTANT ANSWER

Coasting battleship Suppose that an Iowa class battleship has mass around $51,000$ metric tons $( 51,000,000 \mathrm { kg } )$ and a $k$ value in Equation $( 1 )$ of about $59,000 \mathrm { kg } / \mathrm { sec } .$ Assume that the ship loses power when it is moving at a speed of 9$\mathrm { m } / \mathrm { sec } .$ a. About how far will the ship coast before it is dead in the water? b. About how long will it take the ship's speed to drop to 1$\mathrm { m } / \mathrm { sec } ?$

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Satyam Gupta

Numerade educator

Investments Phyllis invested $\$ 12,000,$ a portion earning a simple interest rate of 4$\frac{1}{2} \%$ per year and the rest earning a rate of 4$\%$ per year. After 1 year the total interest earned on these investments was $\$ 525 .$ How much money did she invest at each rate?

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Umar Sohail Qureshi

Numerade educator

Suppose $N$ electrons can be placed in either of two configurations. In configuration $1,$ they are all placed on the cir- cumference of a narrow ring of radius $R$ and are uniformly distrributed so that the distance between adjacent electrons is the same everywhere. In configuration $2, N-1$ electrons are uniformly distributed on the ring and one electron is placed in the center of the ring. (a) What is the smallest value of $N$ for which the second configuration is less energetic than the first? (b) For that value of $N,$ consider any one circumference electron $-$ call it $e_{0} .$ How many other circumference electrons are closer to $e_{0}$ than the central electron is?

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Joshua Trocino

Numerade educator

Leticia has been tracking two volatile stocks. Stock A over the last year has increased $10 \%,$ and stock B has increased $14 \%$ (using a simple interest model). She has $\$ 10,000$ to invest and would like to split it between these two stocks. If the stocks continue to perform at the same rate, how much should she invest in each for one year to result in a balance of $\$ 11,260 ?$

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Tianyu Li

Numerade educator

A student calculates the density of iron as 6.80 $\mathrm{g} / \mathrm{cm}^{3}$ by using lab data for mass and volume. A handbook reveals that the correct value is 7.86 $\mathrm{g} / \mathrm{cm}^{3} .$ What is the percentage error?

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Ramesh Rajak

Numerade educator

State whether the following statement is true and explain why or why not: A trinomial is always a higher degree than a monomial.

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Patrick W.