The atomic mass of potassium is 39. if its atomic number is 9, it has how many neutrons within each potassium atom?

A treasure chest has a mass of 5200g and a volume of 1400ml. Does it float in fresh water. Show your work.

Which wave interaction causes you to hear your voice a second time after you' shout in a gymnasium?

Which property is expressed in g/cm3

A ball is dropped from a height of 20 meters. At what height does the ball have a velocity of 10 meters/second? A. 5.1 meters B. 9.8 meters C. 25 meters D. 15 meters

4) What is the speed of a bike if it moves 50 meters in 5 seconds?

What best describes the angle between a changing electric field and the electromagnetic wave produced by it? 1. always equal to a right angle 2. always less than a right angle 3. varies from parallel to perpendicular 4.

Which data set has the smallest standard deviation? A. 1,6,19,20,85,29,0 B. 22,22,23,23,22,22,23 C. 6, 7, 6, 7, 1004, 980, 350 D. 99, 199, 299, 55, 44,33, 22

To calculate the specific heat capacity of some liquid, we have poured 235 g of water at a temperature of 18.0°C into 250 g of this liquid at a temperature of 27.0 °C in a calorimeter with a heat capacity of 210 J/K. The temperature stabilized at 20.

How do you reduce friction

3. A 16 kg barrel is lifted up by a rope. The barrel accelerates at 1.4 m/s2. Find the force exerted by the rope. Show all your work. Answer: