Consider the following statements and decide which of the listed scientists was responsible for each. You will use each scientist's name only ones. Dalton Thomson Rutherford Bohr

a. Believed that atoms were small indivisible particles
b. Developed the model of the atom that we still use today
c. Shot positively charged particles at gold foil, leading to discovery of the nucleus.
d. believed that the atom was a positive clump with negative charges embedded throughout, like a "chocolate chip cookie model"

Select all the correct answers. which three statements about electromagnetic radiation are true?

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?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?