When a boxer moves into an oncoming punch, the force experienced is
A) decreased.
B) increased.
C) no different, but the timing is different.
D) all of the above
Answer: B
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A wave is traveling with a velocity of 300 m/s and strikes a surface at an angle of 30.0 degrees with the normal to the surface. The wave splits into a reflected part and a refracted part. The refracted wave travels with a velocity of 400 m/s. What is the angle of refraction?
A. 20.5 degrees B. 25.9 degrees C. 30.5 degrees D. 41.8 degrees E. 50.3 degrees
Total mechanical energy of a system is conserved when there are no ________ forces doing work on the system.
What will be an ideal response?
The Earth's temperature increases with depth. Pressure also increases with depth from the weight of the rock above. As pressure increases the
A) rock above begins to melt. B) melting point of the rock (at depth) decreases. C) melting point of the rock (at depth) also increases. D) temperature increases, rocks begin to melt.
Ganymede and Callisto have densities suggesting they are made of rocky cores and mantles of
A) hydrogen. B) iron. C) liquid methane. D) ammonia ice. E) water or ice.