7. In the fig below block A placed on block B. Block A weighs 3 N and Block B weighs 4 N. Block A attached
to a wall by a string. A 30 N force applied to block B. The coefficient of kinetic friction µk between block A
and B is 0.3. Identify the forces acting on block A and find the tension in the string attached to block A?
1. Show ALL equations, then substitution of numerical values with units.
2. If you have a string of numbers with no preceding equation, sketch, or explanation, you will receive NO CREDIT even if it leads to the correct answer.
3. Make sure all symbols used are clearly identified on your sketch. BOX each required answer. Show work in a Logical Order – Don’t jump around.
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Ответ:
A decreased wavelength means higher pitch
Higher wavelength means lower pitch.
Think about an airplane. It makes noise and flies towards you, so you hear a higher pitch. As soon as it passes you, you hear a neeew. Changing from the high pitch to a lower pitch