Explain why it is sometimes necessary for scientists to replace a scientific model?

Anita is running to the right at 5 m/s, as shown in (Figure 1). Balls 1 and 2 are thrown toward her by friends standing on the ground. According to Anita, both balls are approaching her at 16 m/s.

why does carrying furniture up four flights of stairs require twice as much work as caring furniture up two flights of stairs

What is the equation for specific heat capacity?

The three major scales used to measure earthquakes are Mercalli Scale, Richter Scale and Magnitude Scale.

How does insulation in your home affect the transfer of thermal energy?

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L

What kind of tide is responsible for extreme tides

What does the speed of sound depend on? A. Medium that the sound travels through B. Acoustics C. Frequency of the sound D. Loudness of the sound

Which of these is not a source of the shock waves that lead to protostars?

Which kind of information is known about a person if that person's DNA is in a database? A. how old the person is B. where the person was probably born C. some diseases the person might have D. whether the person is likely to commit a crime