The definitions of an acid and a base as substances that give H+ and OH- ions, respectively, in water were proposed by the chemist named ______________
Fill in the blank(s) with correct word
Arrhenius
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What is one idea why a relatively dense protogalactic cloud more likely to produce an elliptical galaxy than a spiral galaxy?
A) The force of gravity from the higher gas density can pull the material into a more spherical shape. B) The more frequent collisions between particles in the high-density gas randomize the particle orbits. C) The thickness of the dense cloud prevents a disk from forming. D) The higher gas density allows more rapid star formation, leaving little gas to form a disk.
You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1370 Hz
You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1330 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s. A) 38.4 m/s B) 30.0 m/s C) 39.2 m/s D) 40.0 m/s E) 41.7 m/s
If the temperature of a sample of water at 0°C is slightly increased, its volume
A) increases. B) decreases. C) remains the same.
A 0.50-kg mass is attached to a spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position
(a) What is the amplitude of vibration? (b) At what location are the kinetic energy and the potential energy the same?