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Joana Kim

Joana K.

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A volume of air (assumed to be an ideal gas) is first cooled without changing its volume and then expanded without changing its pressure, as shown by the path $a b c$ in Fig. 19.30 . (a) How does the final temperature of the gas compare with its initial temperature? (b) How much heat does the air exchange with its surroundings during the process $a b c ?$ Does the air absorb heat or release heat during this process? Explain. (c) If the air instead expands from state $a$ to state $c$ by the straight-line path shown, how much heat does it exchange with its surroundings?

A volume of air (assumed to be an ideal gas) is first cooled without changing its volume and then expanded without changing its pressure, as shown by the path $a b c$ in Fig. 19.30 . (a) How does the final temperature of the gas compare with its initial temperature? (b) How much heat does the air exchange with its surroundings during the process $a b c ?$ Does the air absorb heat or release heat during this process? Explain. (c) If the air instead expands from state $a$ to state $c$ by the straight-line path shown, how much heat does it exchange with its surroundings?

University Physics with Modern Physics

Use the flowchart in Figure $4.54$ to determine the relationship between $(R)-3$-methylcyclohexene and $(S)-4$-methylcyclohexene. Draw cis- 1,4 dimethylcyclohexane (label it $\mathbf{A}$ ) and draw its mirror image (label it $\mathbf{B}$ ). Use the flowchart in Figure $4.54$ to determine the relationship between $\mathbf{A}$ and $\mathbf{B}$.

Organic Chemistry

Value of an Expression Find the exact value of the expression. $$ \csc \left(\cos ^{-1} \frac{7}{25}\right) $$

Value of an Expression Find the exact value of the expression. $$ \csc \left(\cos ^{-1} \frac{7}{25}\right) $$

Precalculus Mathematics for Calculus

Trigonometric Functions: Right Triangle

Inverse Trigonometric Functions and…

By the "Angle-Side-Angle" theorem from elementary geometry, triangles $C D O$ and $A O B$ in the figure are congruent. Explain how this proves that if $B$ has coordinates $(x, y),$ then $D$ has coordinates $(-y, x) .$ Then explain how the figure shows that the following reduction formulas are valid: $$\begin{array}{l}{\sin \left(t+\frac{\pi}{2}\right)=\cos t} \\ {\cos \left(t+\frac{\pi}{2}\right)=-\sin t} \\ {\tan \left(t+\frac{\pi}{2}\right)=-\cot t}\end{array}$$

Algebra and Trigonometry

Trigonometric Functions: Unit Circle…

Trigonometric Functions of Real Numbers

Questions asked

ANSWERED

Rashmi Sinha verified

Numerade educator

4. Two radio antennas separated by 300 m as shown in simultaneously broadcast identical signals at the same wavelength. A radio in a car traveling due north receives the signals. (a) If the car is at the position of the second maximum, what is the wavelength of the signals? (b) How much farther must the car travel to encounter the next maximum in reception?

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ANSWERED

Vishal Gupta verified

Numerade educator

As shown in the figure, a layer of water covers a slab of material X in a beaker. A ray of light traveling upward follows the path indicated. Using the information on the figure, find: [a] the index of refraction of material X and, [b] the angle the light makes with the normal in the air.

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ANSWERED

Supratim Pal verified

Numerade educator

2. Two thin lenses with a focal length of magnitude 13.0 cm , the first diverging and the second converging, are located 19.00cm apart. An object 1.80mm tall is placed 20.0cm to the left of the first (diverging) lens. How far from this first lens is the final image formed? Is the final image real or virtual? What is the height of the final image? Is it erect or inverted? Make drawing of a ray diagram.

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ANSWERED

Supratim Pal verified

Numerade educator

1. A spherical mirror is to be used to form image, on a screen located 6.00 m from the object. The image is 6 times the size of the object. (a) Describe the type of mirror required. (b) Where should the mirror be positioned relative to the object? (c) Make drawing of a ray diagram.

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ANSWERED

Susan Hallstrom verified

Numerade educator

1. Consider a candy jar, initially with 1000 candies. You walk past it once each hour. Since you don’t want anyone to notice that you’re taking candy, each time you take 10% of the candies remaining in the jar. Sketch a graph of the number of candies for a few hours. 2. How would the graph change if instead of removing 10% of the candies, you removed 20%? Sketch your new graph.

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ANSWERED

Susan Hallstrom verified

Numerade educator

Consider a candy jar, initially with 1000 candies. You walk past it once each hour. Since you don’t want anyone to notice that you’re taking candy, each time you take 10% of the candies remaining in the jar. Sketch a graph of the number of candies for a few hours.

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ANSWERED

Mark Scythian verified

Numerade educator

2. Using junction and loop rules determine the current in each branch of the circuit shown in Figure,

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ANSWERED

Eduard Sanchez verified

Numerade educator

When lightning strikes, the current flows from the ground upward to the clouds above. What is the direction of the electric field of the lightning? a) upward b) downward c) perpendicular to the current at each location on the lightning bolt d) parallel to the ground

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ANSWERED

Eduard Sanchez verified

Numerade educator

If the temperature of copper goes down, its resistivity a. goes down. b. stays the same. c. goes up. d. increases as the square. e. decreases as the square.

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ANSWERED

Eduard Sanchez verified

Numerade educator

If you wish to take a picture of a bullet traveling at 600 m/s, then a very brief flash of light produced by an RC discharge through a flash tube can limit blurring. Assuming 1.00 mm of motion during one RC constant is acceptable, and given that the flash is driven by a 660-μF capacitor, what is the resistance in the flash tube?

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