- #1
Griffy11
- 27
- 0
Hi everyone,
First question:
A radio-controlled car on a straight track accelerates uniformly from rest to 1.5m/s-1 in 5 seconds. The car continues at a constant velocityh for 10 sec, and decelerates uniformly to come to rest in 2 sec.
a) Draw a velocity-time graph for the data above. -Done.
b) Calculate the acceleration at 3 seconds after start:
a=v-u/t
a=0.9-0/3
a=0.3m/s
Is that right?
c) Calculate total distance travelled.
Here, I have no idea. I thought distance=speed/time at first, but that makes no sense at all. Then I thought displacement:
r=ut+1/2at^2
Would that be the right formula to use to find the total distance travelled, or am I doing something wrong?
Second thing, which seems basic... (sorry for the crappy diagram)
http://img62.imageshack.us/img62/383/quickdiagram.jpg
Compare the effect on the intensity of the light globe when another identical globe is added in series as opposed to adding it in parallel.
What I thought was that in series, both lights would be quite dim, but in parallel... heck I'm rambling, I have no real idea. =\
Thanks for the help in advance everyone, it's greatly appreciated. :)
First question:
A radio-controlled car on a straight track accelerates uniformly from rest to 1.5m/s-1 in 5 seconds. The car continues at a constant velocityh for 10 sec, and decelerates uniformly to come to rest in 2 sec.
a) Draw a velocity-time graph for the data above. -Done.
b) Calculate the acceleration at 3 seconds after start:
a=v-u/t
a=0.9-0/3
a=0.3m/s
Is that right?
c) Calculate total distance travelled.
Here, I have no idea. I thought distance=speed/time at first, but that makes no sense at all. Then I thought displacement:
r=ut+1/2at^2
Would that be the right formula to use to find the total distance travelled, or am I doing something wrong?
Second thing, which seems basic... (sorry for the crappy diagram)
http://img62.imageshack.us/img62/383/quickdiagram.jpg
Compare the effect on the intensity of the light globe when another identical globe is added in series as opposed to adding it in parallel.
What I thought was that in series, both lights would be quite dim, but in parallel... heck I'm rambling, I have no real idea. =\
Thanks for the help in advance everyone, it's greatly appreciated. :)
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