- #1
smoki
- 1
- 0
I think this is a simple question but I'm not sure if I'm doing it right, this is what I have so far...
A watch has a second hand 2.0 cm long.
a) Compute the speed of the tip of the second hand.
C = 2pi(r) r = 2.0cm = 0.02m - leave as cm or convert to m?
V = [2pi(0.02m)]/60s = 2.1 x 10^-3 m/s - divide by 60s? :uhh:
b) What is the velocity of the tip of the second hand at 0.0s ? At 15 seconds?
well 0s=60s right...? if so then the answer is the same as a)
for 15s V=[2pi(0.02m)]/15s = 8.3 x 10^-3 m/s
c) Compute its change in velocity between 0.0 and 15 seconds.
?
d) Compute its average vector acceleration between 0.0 and 15 seconds.
I think I could answer this if I could figure out c)
A watch has a second hand 2.0 cm long.
a) Compute the speed of the tip of the second hand.
C = 2pi(r) r = 2.0cm = 0.02m - leave as cm or convert to m?
V = [2pi(0.02m)]/60s = 2.1 x 10^-3 m/s - divide by 60s? :uhh:
b) What is the velocity of the tip of the second hand at 0.0s ? At 15 seconds?
well 0s=60s right...? if so then the answer is the same as a)
for 15s V=[2pi(0.02m)]/15s = 8.3 x 10^-3 m/s
c) Compute its change in velocity between 0.0 and 15 seconds.
?
d) Compute its average vector acceleration between 0.0 and 15 seconds.
I think I could answer this if I could figure out c)