What is the radius of curvature of a concave mirror that magnifies an object by a factor of -3.2 when the object is placed 20 cm from the mirror?

A dance club has a $5 cover charge and averages 300 customers on Friday nights. Over the past several months, the club has changed the cover price several times to see how this affects the number of customers. For every increase of$0.50 in the cover charge, the number of customers decreases by 30. Use an algebraic model to determine the cover charge that maximizes revenue.

Which of the following substances is not a source of methane? a. fossil fuels b. sewage c. fertilizer d. rice

If the gain of an amplifier changes from a value of $-1000 \text{ by } 10\%$, calculate the gain change if the amplifier is used in a feedback circuit having $\beta = -1/20$.

In the reverse-bias region the saturation current of a silicon diode is about $0.1\;\mu \text{A}$ ($T=20\;^{\circ}\text{C}$). Determine its approximate value if the temperature is increased $40\;^{\circ}\text{C}$.

The characteristic that allows an isolation amplifier to amplify small signal voltages in the presence of much greater noise voltages is its (a) CMRR, (b) high gain, (c) high input impedance, (d) magnetic coupling between input and output

A concave mirror has a radius of curvature of 26.0 cm. An object that is 2.4 cm tall is placed 30.0 cm from the mirror. a. Where is the image position? b. What is the image height?

A plastic-film capacitor, whose coded value is $333\text{M}$, measures $0.025\space\mu\text{F}$ when tested with a capacitor-inductor analyzer. The measured capacitance is a. well within tolerance. b. barely within tolerance. c. slightly out of tolerance. d. right on the money.

An object is located 4.4 cm in front of a concave mirror with a 24.0-cm radius. Locate the image using the mirror equation.

In a certain town three newspapers are published. 20% of the population read A, 16% read B, 14% read C, 8% read A and B, 5% read A and C, 4% read B and C, and 2% read all 3 newspapers. A person is selected at random. Use a Venn diagram to help determine the probability that the person reads: a. none of the papers b. at least one of the papers c. exactly one of the papers d. either A or B e. A, given that the person reads at least one paper f. C, given that the person reads either A or B or both.

Determine the temperature coefficient of a 5-V Zener diode (rated 25$^{\circ} \mathrm{C}$ value) if the nominal voltage drops to 4.8V at temperature of 100$^{\circ} \mathrm{C}$.

A light ray strikes a plane mirror at an angle of $28^{\circ}$ to the normal. If the light source is moved so that the angle of incidence increases by $34^{\circ}$, what is the new angle of reflection?

A large corporation starts at time t = 0 to invest part of its receipts continuously at a rate of P dollars per year in a fund for future corporate expansion. Assume that the fund earns r percent interest per year compounded continuously. So, the rate of growth of the amount A in the fund is given by dA/dt = rA + P where A = O when t = 0. Solve this differential equation for A as a function of t.

Shiny spheres that are placed on pedestals on a lawn are convex mirrors. One such sphere has a diameter of 40.0 cm. A 12-cm-tall robin sits in a tree that is 1.5 m from the sphere. Where is the image of the robin and how tall is the image?