Answer:fluid friction
Explanation:
Creates less friction due to the liquids.
Answer:
Final velocity of ball is 85.75 m/s
Explanation:
According to the problem, ball is dropped from the window and it experience an acceleration due to Earth's gravity which is denoted by g.
Initially, the ball is at rest, so its initial velocity is zero. The ball takes 8.75 s to fall from the window and hits the ground.
The equation of motion for constant acceleration is :
v = u + at
Here v is final velocity, u is initial velocity, t is time and a is acceleration.
In this case, u is zero and a is equal to g. So, the equation becomes :
v = gt
Substitute 8.75 s for t and 9.8 m/s² for g in the above equation.
v = 9.8 x 8.75
v = 85.75 m/s
Answer:
Let the weight of the person be W and be located at a distance 'a' from the left scale as shown in the figure
Since the body is in equilibrium we can use equations of statics to analyse the problem.
Taking Sum of Moments about A we have
Taking Sum of Moments about B we have
Solving the above 2 equations for W and 'a' we get
Answer:
a) v = 2,152 10⁸ m / s b) t = 2.71 10⁸ s or t = 85.93 year
Explanation:
a) In this special relativity exercise we have that time is measured in the same ship, so it is the proper time,
v = d / t
Let's reduce the distance to the SI system
d = 4.3 l and (9.46 1015 m / 1ly) = 40.678 10¹⁵ m
t = 5.0 y (365 day / 1 y) (24 h / 1 day) (3600s / 1h) = 1.89 10⁸ s
Let's calculate
v = 40.678 10¹⁵ / 1.89 10⁸
v = 2,152 10⁸ m / s
b) The time seen from the ground for which the ship moves is given by
t = t₀ / √ (1- (v/c)²)
Let's calculate
t = 1.89 10⁸ / √ (1 - (2.152 / 2.998)²)
t = 1.89 10⁸ / 0.6962
t = 2.71 10⁸ s
Let's reduce this time to years
t = 2.71 10⁸ s (1h / 3600s) (1day / 24h) (1 and / 365 d)
t = 85.93 year
