What simple machines would move or turn an object?
question 3 options:
wheel and axle
lever
screw
wedge
4.a see-saw is an example of what type of lever?
question 4 options:
first class
second class
third class
fourth class

Explain using examples, what is simple harmonic motion and why it is an important area of study in physics.

Use the empirical rule. the mean speed of a sample of vehicles along a stretch of highway is 70 miles per hour, with a standard deviation of 4 miles per hour. estimate the percent of vehicles whose speeds are between 66 miles per hour and 74 miles per hour. (assume the data set has a bell-shaped distribution.)

Which changes of state do the labels represent? a: b: c: