Which of the following are good ways to test whether a solution is an acid or a base?

Tasting it

Litmus paper

Phenolphthalein

Touching it

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

A step-down transformer has 79 turns in its primary coil and 15 turns in its secondary coil. The primary coil is connected to standard household voltage (e m frms = 120.0 V, 60.0 Hz). Suppose the secondary coil is connected to a 12.

A large bottle contains 150 L of water, and is open to the atmosphere. If the bottle has a flat bottom with an area of 2 ft, calculate the absolute pressure at the bottom of the bottle. Give your answer in Pa.

A cheetah can go from a state of resting to running at 20 m/s in just 2 seconds. What is the cheetah's average acceleration?

What would happen if the ozone layer were completely destroyed? A: X-rays and gamma rays would no longer get through the atmosphere. B: Meteorites would be able to fall through the atmosphere and would destroy life of all types.

What is the conversion of celcius to kelvin?

Why does the percentage of water vapor vary?

A situation that restricts something

Why is the sky blue all the time

Where did the rotational kinetic energy of the earth come from?