6. Choose the hypothesis for the controlled experiment that answers the question: "How does a virus spread?" O A virus is spread through contact on surfaces.
O A virus is dangerous if you get it.
O
A virus is similar to a bacteria.
O A virus is not contagious.

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in

Smallest intensity of a stimulus that you can detect 50 percent of the time is

One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.