An RC circuit is connected across a DC voltage source through an open circuit and a switch. As soon as the switch is closed, the charge on the capacitor increases but the voltage across it decreases as a function of time
Indicate whether the statement is true or false
FALSE
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Beats: A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0 m/s. The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s?
A. 5000 Hz B. 4500 Hz C. 8490 Hz D. 9000 Hz E. 4250 Hz
A 1.00-kg duck is flying overhead at 1.50 m/s when a hunter fires straight up. The 0.0100-kg bullet is moving 200 m/s when it hits the duck and stays lodged in the duck's body. What is the speed of the duck and bullet immediately after the hit?
a. 1.49 m/s c. 2.48 m/s b. 1.80 m/s d. 2.50 m/s
Which of the following is a Kuiper Belt Object that is quite large and has about the same diameter as Pluto but is 27% more massive?
A) Titan B) Io C) Eris D) Nereid
A star is observed with a surface temperature of 3,000 K and a luminosity of 10?2 solar. What is the approximate mass of this star?
A) 0.5 Msun B) 0.9 Msun C) 0.2 Msun D) The mass cannot be determined.