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Gregory Ayala

Gregory A.

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ANSWERED

Satyam Gupta verified

Numerade educator

After careful analysis, an electromagnetic wave is found to have a frequency of $7.8 \times 10^{6} \mathrm{H} \mathrm{z}$ What is the speed of the wave?

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Rabia Shuaib verified

Numerade educator

A voltaic cell consists of a Pb>Pb2+ half-cell and a Cu>Cu2+ half-cell at 25 C. The initial concentrations of Pb2+ and Cu2+ are 0.0500 M and 1.50 M, respectively. a. What is the initial cell potential? b. What is the cell potential when the concentration of Cu2+ has fallen to 0.200 M? c. What are the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.35 V?

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Cyra Jelle Calleja verified

Numerade educator

A glass sphere has radius $R=5.0 mathrm{cm}$ and index of refraction $1.6 .$ A paperweight is constructed by slicing through the sphere along a plane that is 2.0 $mathrm{cm}$ from the center of the sphere, leaving height $h=3.0 mathrm{cm} .$ The paper weight is placed on a table and viewed from directly above by an observer who is distance $d=8.0 mathrm{cm}$ from the tabletop. When viewed through the paperweight, how far away does the tabletop appear to be to the observer?

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ANSWERED

Cyra Jelle Calleja verified

Numerade educator

Suppose a star the size of our Sun, but with mass 8.0 times as great, were rotating at a speed of 1.0 revolution every 9.0 days. If it were to undergo gravitational collapse to a neutron star of radius 12 km, losing \(\frac{3}{4}\) of its mass in the process, what would its rotation speed be? Assume the star is a uniform sphere at all times. Assume also that the thrownoff mass carries off either $(a)$ no angular momentum, or $(b)$ its proportional share $(\frac{3}{4})$ of the initial angular momentum.

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Christopher Nilsen verified

Numerade educator

A 25.3-g sample of an unknown compound contains 0.8 g of oxygen. What is the percent by mass of oxygen in the compound?

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Indicate whether each statement is true or false: (a) The liquid crystal state is another phase of matter, just like solid, liquid, and gas. (b) Liquid crystalline molecules are generally spherical in shape. (c) Molecules that exhibit a liquid crystalline phase do so at well-defined temperatures and pressures. (d) Molecules that exhibit a liquid crystalline phase show weaker-than-expected intermolecular forces. (e) Molecules containing only carbon and hydrogen are likely to form liquid crystalline phases. (f) Molecules can exhibit more than one liquid crystalline phase.

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Linda Winkler verified

Numerade educator

At $t = 0$, an 885-g mass at rest on the end of a horizontal spring ($k =$ 184 N$/$m) is struck by a hammer which gives it an initial speed of 2.26 m$/$s. Determine ($a$) the period and frequency of the motion, ($b$) the amplitude, ($c$) the maximum acceleration, ($d$) the total energy, and ($e$) the kinetic energy when $x =$ 0.40$A$ where $A$ is the amplitude.

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Debasish Das verified

Numerade educator

What is the greatest number of planes determined by four noncollinear points?

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Paul Gabriel verified

Numerade educator

The fastest served tennis ball, served by "Big Bill" Tilden in 1931, was measured at 73.14 m/s. The mass of a tennis ball is 57 g, and the ball, which starts from rest, is typically in contact with the tennis racquet for 30.0 ms. Assuming constant acceleration, (a) what force did Big Bill's tennis racquet exert on the ball if he hit it essentially horizontally? (b) Draw free-body diagrams of the ball during the serve and just after it moved free of the racquet.

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INSTANT ANSWER

Draw the demand curve, marginal revenue, and marginal cost curves from Figure 9.6, and identify the quantity of output the monopoly wishes to supply and the price it will charge. Suppose demand for the monopoly’s product increases dramatically. Draw the new demand curve. What happens to the marginal revenue as a result of the increase in demand? What happens to the marginal cost curve?Identify the new profit-maximizing quantity and price. Does the answer make sense to you?

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