With what speed will a clock have to be moving in order to run at a rate that is one half the rate of a clock at rest?
Posted by Mona
Using the formula for Relativistic Time (according to Special Theory of Relativity)
√[1 - (v²/c²)] = ½ → v² = (3/4)c²
v = [√3/2]*c = .866c
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What is the angle between the directions of acceleration and velocity at the highest point of projectile?
At the highest point of a projectile, the vertical component of velocity is zero and the velocity is entirely horizontal. The direction of acceleration (due to gravity) is vertically downwards throughout the motion of the projectile.
Therefore, the angle between the direction of acceleration and velocity at the highest point of a projectile is 90 °
A rock is thrown vertically upward from the ground with an initial speed 15m/s.
a. how high does it go
b. how much time is required for the rock to reach its maximum height?
c. what is the rock’s height at t=2.00s?
(Posted by Merhawi)
v=0 m/s (at the max height)
(b) From the above case
(c) Use S = ut + 1/2 at2
put t=2s, u = 15m/s, a=-10m/s2
S=30 – 20 = 10 m
(If you use g = 9.8 m/s2 The answers will be slightly different)
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