The figure shows the speedometer readings as a car comes to a stop. Solve graphically for the acceleration at t = 7.0 s.
A. 2.5 
B. - 2.5
C. - 2.0
D. 2.0
B. - 2.5
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Suppose you're on a hot air balloon ride, carrying a buzzer that emits a sound of frequency f. If you accidentally drop the buzzer over the side while the balloon is rising at constant speed, what can you conclude about the sound you hear as the buzzer falls towards the ground?
1.The frequency and intensity increase. 2.The frequency decreases and the intensity increases. 3.The frequency decreases and the intensity decreases. 4.The frequency remains the same, but the intensity decreases.
First Law of Thermodynamics: During an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much heat is added to the gas during this process?
A. 0 J B. 50 J C. -50 J D. 25 J E. -25 J
Beyond the formation of iron, nuclear energy can be produced only by:
A) fusion of still heavier elements. B) ionization of the radioactive nuclei. C) fission of heavy nuclei back toward lighter ones. D) gravity. E) the dark force.
Halley's comet has an elliptical orbit around the Sun with a period of 76.0 years. At its closest approach (perihelion) it is 8.82 × 1010 m from the Sun and has a speed of 54.6 km/s
How fast is it moving at its furthest point from the Sun (aphelion)? The mass of the Sun is 2.00 × 1030 kg and G = 6.67 x 10-11 N•m2/kg2. A) 604 m/s B) 802 m/s C) 1070 m/s D) 1540 m/s E) 1860 m/s