If two waves pass a point every second, what is the frequency of the waves?
a. one wave per second
b. two waves per second
c. half a wave per second
d. one wave per two seconds

The speed of light can be used to measure the

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.