Last call please help me A student does an experiment to estimate the density of an irregularly shaped stone. Which items of equipment are needed

a)a balance and a measuring cylinder containing water
b)a balance and a ruler
c)a ruler and a measuring cylinder containing water
d)only a measuring cylinder containing water

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?

Which describes an object in projectile motion? check all that apply. a.gravity acts to pull the object downb. the object moves in a straight path. c.the forward velocity of the object is 0 m/s. d.the object’s inertia carries it forward. e.the path of the object is curved.