What are the four forces?
A.) Gravity, electromagnetic, weak, and strong.
B.) Weak, weaker, strong, stronger.
C.) Photons, quarks, electrons, and protons.
D.) Gravity, quarks, mesons, and leptons.
E.) Electromagnetic, photons, light, and heat.
Ans: A.) Gravity, electromagnetic, weak, and strong.
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If a force accelerates 4.5 kg at 40. m/s2, that same force would accelerate 18. kg by how much?
A) 0.18 km/s2 B) 40. m/s2 C) 10. m/s2 D) 32. ft/s2 E) 0.16 km/s2
You are driving along a highway at 25 m/s when you hear the siren of an emergency vehicle traveling in the opposite direction on the other side of the highway
When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the speed of the vehicle? The speed of sound in air is 343 m/s. A) 35 m/s B) 32 m/s C) 30 m/s D) 41 m/s E) 50 m/s
What happens to a particle's wave packet when a highly accurate position measurement is performed?
A) It suddenly makes a transition into a state of smaller uncertainty in position, with no change in its uncertainty in velocity. B) It makes a gradual transition to a state of greater uncertainty in position but smaller uncertainty in velocity. C) It makes a gradual transition to a state of smaller uncertainty in position and greater uncertainty in velocity. D) It suddenly makes a transition into a state of greater uncertainty in position but smaller uncertainty in velocity. E) It suddenly makes a transition into a state of smaller uncertainty in position and greater uncertainty in velocity.
Series/Parallel Circuits: What is the potential drop from point A to point B for the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.
A. 0.35 V B. 2.0 V C. 2.5 V D. 3.0 V