Refracting telescope: The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is 4.96 × 107 m and the distance from the earth at the time of observation is 4.4 × 1012 m. What is the angle (in mrad) subtended by the final telescopic image of Neptune?
Read DetailsA 19.0 mH inductor is connected across an AC generator that produces a peak voltage of 10.5 V. a) What is the peak current through the inductor if the emf frequency is 100 Hz? (3 points) b) What is the peak current through the inductor if the emf frequency is 100 kHz? (3 points)
Read DetailsMaria owns a small convenience store, and unfortunately very small, shoplifting related losses occur at her store quite frequently (at least once per week). For the past year she has hired a security guard to attempt to minimize the likelihood of shoplifting occurring. However, after her own analysis she believes she is paying too much for the security guard’s services. Instead of paying for risk prevention technique, Maria has made the decision to set aside money each month to pay for these very low severity and rather predictable shoplifting losses. Which method of risk financing is Maria practicing?
Read DetailsThe magnetic field in the figure is decreasing at the rate 0.45 T/s. (e = 1.60 x10-19 C, mproton = 1.67×10-27 kg) a) What is the magnitude of the acceleration of a proton at rest at point a? What is the direction of acceleration of point a? b) What is the magnitude of the acceleration of a proton at rest at point d? What is the direction of acceleration of point d?
Read DetailsA3.0 mH inductor is connected in parallel with a variable capacitor. The capacitor can be varied from 160 pF to 280 pF. a) What is the minimum oscillation frequency for this circuit? (2 points) b) What is the maximum oscillation frequency for this circuit? (2 points)
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