What's the difference between a physical and chemical change and how do you know which is happened?

An airplane travels down a runway for 4.0 seconds with an acceleration of 9.0 m/s what is its change in velocity during this time

If a rock weighing 2,200 N is dropped from a height of 15 m, what is its kenetic energy just before it hits the ground

Vx = 20 m/s, vy = 43 m/s. Find the vector's magnitude.

Carry out the following calculation. Express your answer in the correct number of significant figures. A solid rectangular block has a density of 2.6 g/cm3. The block measures 1.8 cm by 4.0 cm by 2.3 cm. What is the mass, in g, of the block?

Which of the following may be described as a saturated hydrocarbon? 1. Octane 2. Propene 3. Hexene 4. Ethylene

Which will have the greatest effect on power consumption A.) add more circuit brakes and fuses B.) turn on all electric devices in a circuit C.) turn on only the electrical devices that use the most watts D.

13. Which best summarizes the change in number and size of microcontinents during the Proterozoic? a. the number of microcontinents increased and the size increased b. the number of microcontinents increased and the size decreased c.

What is the 3d model of oxygen molecule

If you need to drive from Dallas, Texas, to Salt Lake City, Utah, (about 1500 miles), and the speed limit is 60 miles per hour most of the way, what is the least amount of time you will need? A. 4 hours B. 25 hours C. 2.5 hours D. 90,000 hours

Which of the following statements about the Coriolis effect is correct? a. The Coriolis effect is not affected by wind speed. b. The Coriolis effect is weakest at the poles. c. The Coriolis effect does not affect wind direction. d.