Answer:
A. As the ropes are horizontal the child has travelled 2m of vertical displacement from his lowest position.
Gpe @ A=mgh=40*9.81*2=784.8J
B. At 30degree vertical angle the vertical displacement from lowest position is given by
2-2cos(30)=2-1.73=0.27m
Gpe @B= 40*9.81*0.27=106 J
C: at the bottom of circular arc it's Gpe is zero relative to lowest position as bottom of arc itself is lowest position.
I believe so, yes.
(i am just writing this so that it will allow me to post the answer
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Answer:
<h2>To find the resultant force <u>subtract the magnitude of the smaller force from the magnitude of the larger force.</u> The direction of the resultant force is in the same direction as the larger force. A force of 5 N acts to the right, and a force of 3 N act to the left. Calculate the resultant force.</h2>
consider the motion when Jim travels by bicycle
D = total distance to be traveled for the trip = 153 mile
v = speed of riding = 42 mph
t = time taken to complete the trip by bicycle = ?
using the equation
t = D/ v
inserting the values
t = 153/42
t = 3.64 h
while walking and riding :
T = total time taken to complete the trip by walking and riding = 5 hours
t ' = time of walking = T - t = 5 - 3.64 = 1.36 hours
v' = speed of walking = 4 mph
d' = distance traveled by walking = ?
distance traveled by walking is given as
d' = v' t'
d' = 4 x 1.36
d' = 5.44 miles
d = distance traveled by bicycle = D - d' = 153 - 5.44 = 147.56 miles
v = speed of riding = 42 mph
t = time spent on the bicycle = ?
time spent on the bicycle is given as
t = d/v
t = 147.56/42
t = 3.51 hours
Via the half-life equation:
Where the time elapse is 11,460 year and the half-life is 5,730 years.
Therefore after 11,460 years the amount of carbon-14 is one fourth (1/4) of the original amount.