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Entropy (arrow of time)Why did the universe have such low entropy in the past, resulting in the distinction between past and future and the second law of thermodynamics?[2] Why are CP violations observed in certain weak force decays, but not elsewhere? Are CP violations somehow a product of the Second Law of Thermodynamics, or are they a separate arrow of time? Are there exceptions to the principle of causality? Is there a single possible past? Is the present moment physically distinct from the past and future or is it merely an emergent property of consciousness? Why does time have a direction? What links the quantum arrow of time to the thermodynamic arrow?
The drawing shows a 182-kg crate hanging from the end of a steel bar. The length of the bar is 0.08 m, and its cross-sectional area is 4.00 10-4 m2. Determine the shear stress on the bar
Two loudspeakers are vibrating in phase. They are set up as point C is located. Assume the speed of sound is 342 m/s. The speakers play the same tone. What is the smallest frequency that would produce destructive interference at point C.
The dipole moment of a water molecule in liquid water is 6.2×10−30 C·m, and the effective diameter of a water molecule is 2.8×10−10 m. In an earlier homework problem the effective dipole charge separation for water was calculated as 1.9×10−11 m.
a magnetic dipole is under the influence of two magnetic fields. the angle between the field directions is 60ordm and
a cars starter motor draws 59 a from the cars battery during startup. if the startup time is 2.1s how many electrons
Calculate the gauge pressure of the gas in a container
Astronauts use a centrifuge to simulate the acceleration of a rocket launch. What is the astronaut's tangential acceleration during the first 16.0 s
A resistance R and a 1.5-H inductance are in series across a 60-Hz ac voltage. What is the ac input voltage
Three athletes are tugging on a ring. Martha pulls with a force of 150N in the northernly direction. How big is the resultant of the three forces
A magnetic field points perpendicular into a 5x12 cm rectangular coil of 44 turns and resistance .25 omega. wa a certain instant, at what rate is the magnetic field changing in telsa per second
A 400 g mass is suspended from a thread 45 cm long that can sustain a maximum tension of 8.0 N before breaking. What is the maximum allowable amplitude for pendulum motion of this system
A wheel is rotating freely with an angular speed of 20 rad/s on a shaft whose moment of inertia is negligible. Calculate the angular speed of the coupled wheels
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