Acar is traveling in a uniform circular motion on a section of road whose radius is r. the road is slippery, and the car is just on the verge of sliding. a.) if the car's speed were doubled, what would have to be the smalles radius in order that the car does not slid? express your anwer in terms of r. b.) what would be your answer to part (a) if the car were replaced by one that weighed twice as much, the cars speed still being doubled?

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

What is the angular momentum of the bar about the axle?