In which of the following methods of heat transfer is it necessary for the objects to be directly touching one another? a. convection. b. radiation. c. conduction. d. all of these.

Um vetor representa um deslocamento cujo módulo é 20 m. se v faz um ângulo de 60 graus com a horizontal, qual é o valor das componentes horizontal e vertical deste vetor?

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.

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?