Here we have to calculate the number of rotations made by earth around its own axis in the entire life time of a human being.
The average human life is 50 years .
Each year is 365.5 days
Hence 
=18,275 days
The earth rotates around its own axis in 23 hours 56 minutes and 4 second which is approximately equal to 24 hours or one days.
Hence one rotation takes one days.
⇒18,275 days =18,275 rotations
Hence the total number of rotations made by earth around its own axis in the life time of a average human life time will be 18,275 times
The scientist is likely to be studying kinematics.
Kinematics is the branch of science, specifically physics, which is concerned with the motion of objects without reference to the forces that induce this motion. An example of kinematics is studying the change in velocity of an object over time or the distance covered by an object in a specified amount of time.
Answer:
<em>Muons reach the earth in great amount due to the relativistic time dilation from an earthly frame of reference.</em>
Explanation:
Muons travel at exceedingly high speed; close to the speed of light. At this speed, relativistic effect starts to take effect. The effect of this is that, when viewed from an earthly reference frame, their short half life of about two-millionth of a second is dilated. The dilated time, due to relativistic effects on time for travelling at speed close to the speed of light, gives the muons an extended relative travel time before their complete decay. So <em>in reality, the muon do not have enough half-life to survive the distance from their point of production high up in the atmosphere to sea level, but relativistic effect due to their near-light speed, dilates their half-life; enough for them to be found in sufficient amount at sea level. </em>
Answer:
the force acting on the car is 3600 N
Explanation:
The computation of the force acting on the car is shown below:
As we know that
Force = mass × acceleration
= 1200 kg × 3.0 ms/^2
= 3600 N
hence, the force acting on the car is 3600 N
Answer:
Explanation:
acceleration of a rolling body down an inclined surface is given by the formula
a = g sinθ / 1 + k² / R² , θ is inclination , k is radius of gyration , R is radius
It will not depend upon mass .
for solid sphere
k , radius of gyration = √(2/5)R
k² / R² = 2/5 = .4
a = g sin20 / (1 + .4 )
= 2.4 m /s²
from s = ut + 1/2 at²
100 = .5 x 2.4 t²
t = 9.13 s
For hollow sphere
k , radius of gyration = √(2/3)R
k² / R² = 2/3 = .67
a = g sin20 / (1 + .67 )
= 2 m /s².
from s = ut + 1/2 at²
100 = .5 x 2 t²
t = 10 s
So time taken are 9.13 and 10 s respectively.
