suppose you have the following research question: How does low gravity affect an astronaut’s blood pressure? Without actually going into space to find out, what kind of research method should you use?

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

The position of a crate sliding down a ramp is given by x=(0.05t^3) m, y=(1.7t^2) m, z=(6−0.85t^5/2) m, where t is in seconds. (a) determine the magnitude of the crate's velocity when t = 2 s. (b) determine the magnitude of the crate's acceleration when t = 2 s.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?