Numerade

Questions asked

ANSWERED

Pritesh Ranjan

Numerade educator

(III) Two charges, $- Q _ { 0 }$ and $- 4 Q _ { 0 } ,$ are a distance $\ell$ apart. These two charges are free to move but do not because there is a third charge nearby. What must be the magnitude of the third charge and its placement in order for the first two to be in equilibrium?

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ANSWERED

Umar Sohail Qureshi

Numerade educator

(III) Four polarizers are placed in succession with their axes vertical, at 30.0$^\circ$ to the vertical, at 60.0$^\circ$to the vertical, and at 90.0$^\circ$to the vertical. (a) Calculate what fraction of the incident unpolarized light is transmitted by the four polarizers. (b) Can the transmitted light be decreased by removing one of the polarizers? If so, which one? (c) Can the transmitted light intensity be extinguished by removing polarizers? If so, which one(s)?

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ANSWERED

Teresa Fuston

Numerade educator

Forensic scientists use the following functions to find the height of a woman if they are given the height of her femur bone for her tibia bone t in centimeters. $$ egin{array}{l} {H(f)=2.59 f+47.24} \ {H(t)=2.72 t+61.28} end{array} $$ Find the height of a woman whose femur measures 46 centimeters.

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ANSWERED

Prabhat Tyagi

Numerade educator

Percentage of People Who Completed 4 or More Years of College Listed by state are the percentages of the population who have completed 4 or more years of a college education. Construct a frequency distribution with 7 classes. $$ \begin{array}{llllllllll}{21.4} & {26.0} & {25.3} & {19.3} & {29.5} & {35.0} & {34.7} & {26.1} & {25.8} & {23.4} \\ {27.1} & {29.2} & {24.5} & {29.5} & {22.1} & {24.3} & {28.8} & {20.0} & {20.4} & {26.7} \\ {35.2} & {37.9} & {24.7} & {31.0} & {18.9} & {24.5} & {27.0} & {27.5} & {21.8} & {32.5} \\ {33.9} & {24.8} & {31.7} & {25.6} & {25.7} & {24.1} & {22.8} & {28.3} & {25.8} & {29.8} \\ {23.5} & {25.0} & {21.8} & {25.2} & {28.7} & {33.6} & {33.6} & {30.3} & {17.3} & {25.4}\end{array} $$

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ANSWERED

Lorie Mcfee

Numerade educator

In Exercises $55 - 58 ,$ complete parts $( a ) - ( d )$ for the piecewise-definedfunction. $\quad ($ a) Draw the graph of $f$ . (b) At what points $c$ in the domain of $f$ does $\lim _ { x \rightarrow c } f ( x )$ exist? (c) At what points $c$ does only the left-hand limit exist? (d) At what points $c$ does only the right-hand limit exist? $$f ( x ) = \left\{ \begin{array} { l l } { \cos x , } & { - \pi \leq x < 0 } \\ { \sec x , } & { 0 \leq x \leq \pi } \end{array} \right.$$

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INSTANT ANSWER

Find all positive values of $ b $ for which the series $ \sum_{n = 1}^{\infty} b^{\ln n} $ converges.

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ANSWERED

Gokul R Nair

Numerade educator

A weight is supported by cables attached to both ends of a balance beam, as shown in the figure. What angles are formed between the beam and the cables? (FIGURE CAN NOT COPY)

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ANSWERED

Darshan Maheshwari

Numerade educator

An object moves with constant acceleration 4.00 $\mathrm{m} / \mathrm{s}^{2}$ and over a time interval reaches a final velocity of 12.0 m/s. (a) If its original velocity is 6.00 m/s, what is its displacement during the time interval? (b) What is the distance it travels during this interval? (c) If its original velocity is 26.00 m/s, what is its displacement during this interval? (d) What is the total distance it travels during the interval in part (c)?

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INSTANT ANSWER

Santalbic acid, a fatty acid isolated from the seeds of the sandalwood tree, is an unusual fatty acid that contains a carbon-carbon triple bond. What orbitals are used to form each of the three indicated single bonds in santalbic acid? Rank these cr bonds in order of increasing bond strength.

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ANSWERED

Umar Sohail Qureshi

Numerade educator

In 1887 in Bridgeport, Connecticut, C. J. Belknap built the water slide shown in Figure P8.73. A rider on a small sled, of total mass 80.0 kg, pushed off to start at the top of the slide (point ) with a speed of 2.50 m/s. The chute was 9.76 m high at the top and 54.3 m long. Along its length, 725 small wheels made friction negligible. Upon leaving the chute horizontally at its bottom end (point ), the rider skimmed across the water of Long Island Sound for as much as 50 m, “skipping along like a flat pebble,” before at last coming to rest and swimming ashore, pulling his sled after him. (a) Find the speed of the sled and rider at point . (b) Model the force of water friction as a constant retarding force acting on a particle. Find the magnitude of the friction force the water exerts on the sled. (c) Find the magnitude of the force the chute exerts on the sled at point . (d) At point , the chute is horizontal but curving in the vertical plane. Assume its radius of curvature is 20.0 m. Find the force the chute exerts on the sled at point.

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Patrick P.