How is space exploration using space shuttles similar to and different from space exploration using space stations

The ph of your mouth is very similar to that of stomach. true or false?

Aparticle initially moving east with a speed of 20.0 m/s, experiences an acceleration of 3.95 m/s, north for a time of 8.00 s. what was the speed of the particle after this acceleration, in units of m/s? give the answer as a positive number.

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?