Answer:
Explanation:
If Tim jogs a distance of 7.2 km to the west and then he turns south and jogs 1.4 km, the resultant displacement of Tim is calculated using the pythagoras theorem as shown;
R² = 7.2²+1.4²
R² = 51.84+1.96
R² = 53.8
R = √53.8
R = 7.33 km
Hence the resultant of Tim's jog back to the beginning is 7.33km
Warm air rises causing an area of lower air pressure below.
Answer:
Because shoes protect our feet from some of the most harmful platforms
Gravel has some small pebbles on it sometimes (or other sharp objects)
Gravel is pretty hard.
Answer:
Explanation:
The head decelerates from 4 m /s to zero in .2 sec so deceleration = 4 - 0 / .2
= 20 m/s²
If F be the average force acting on head
F - mg = ma
F = m ( g + a )
= 65 ( 9.8 + 20 )
= 1937 N .
This force will be uniformly acting on head in upward direction . So during first half and second half , deceleration is same hence force F will also be same .
This phenomenon is known as parallax. The simplest example is this: if you are sitting in the passenger seat, the gas tank needle may appear to read empty. However, if you are the driver, you will see that you are not on empty, but should get some gas.
