Question

A race car completes the final lap of a race on a 2-kilometer circular track. At the start of the lap, it crosses the line at 60 meters/second. It completes the lap 28.57 seconds later, crossing the line at 85 meters/second. Calculate the displacement and average acceleration of the car within the span of 12 seconds.

Answer 1

first find the average acceleration..

Answer 2

173.57?

Answer 3

(final velocity-initial velocity)/time span

Answer 4

i got 12.08 but its not in my answer choices:o

Answer 5

is there 0.8?

Answer 6

yes(:

Answer 7

i put that as the answer..

Answer 8

and what about displacement?

Answer 9

i put 0 meters for the displacement and .88 meters/second for acceleration

Answer 10

A roller coaster car is loaded with passengers and has a mass of 500 kg along with a speed of 18 meters/second at the dip. The radius of curvature of the track at the bottom point of the dip is 12 meters (gravity = 9.8 meters/second2). What force is exerted on the roller coaster car by the track at the bottom of the dip?

Answer 11

mg+mv^2/r

Answer 12

what is v?
500+18^2/9.8 is it like thta?

Answer 13

i found the answer for that one! i used your formula..

Answer 14

nice to hear it..:)

Answer 15

Do you know this?:P Ocean breezes are due to which method of heat transfer?

Answer 16

. conduction B. convection C. greenhouse gases D. radiation E. geothermal energy

Answer 17

convection

Answer 18

yeah thats what i think also! your right!!!!

Answer 19

:)

Answer 20

for this question, How does thermal energy flow? i think the answer is from high temperature to low temperature? am i right?:o

Answer 21

yes..

Answer 22

cause im taking my final exam and im trying to do all the questions i can but if i dont get one ill let you know so you can help me..

Answer 23

hmm

Answer 24

whats wrong?:o

Answer 25

unless you want to help me in all of them? haha

Answer 26

;)

Answer 27

ok you can ask me...post a new question