a sign that weighs 750 N on Earth i brought to Pluto, which has a gravitational field strength of 0.62 N/kg. What is the weight of the sign on Pluto?

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

It is really hard for me right know

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.