For an object to appear red, what must happen? A. It must refract red light waves.
B. It must diffract red light waves.
C. It must reflect red light wavel
D. It must shift red light waves.

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m

Determine the largest intensity w of the uniform loading that can be applied to the frame without causing either the average normal stress or the average shear stress at section b–b to exceed σ=19 mpa and τ=24 mpa, respectively.