Paul swims 7.5 kilometers in 1.5 hours. What was his average speed?

Suppose astronomers built a 140-meter telescope. how much greater would its light-collecting area be than that of the 10-meter keck telescope? express your answer using two sign

Amother used 150 watts of power to raise a 15 newton object in a time interval of 8.0 seconds. through what vertical distance was the object raised ?

What is the frequency if a wave that pases a given pount 22 times in 2 seconds