Answer:
Explanation:
Initial is all kinetic energy
final is all potential energy (spring)
½kx² = ½mv²
x = √(mv²/k) = √(1.3(2.8²) / 800) = 0.01274 m or about 1.3 cm
L = L₀ - x = 0.439 - 0.013 = 0.426 m
F = kx = 800(0.01274) = 10.192 or about 10.2 N
Answer:
height is 4 times
Explanation:
speed of ball hit by Luis is u
speed of ball hit by Ron is 2u
Let the maximum height traveled by the ball hit by Luis is h and by the ball hit by Ron is h'
At maximum height, the final velocity of ball is zero in both the cases.
Use third equation of motion, we get
For Luis :
.... (1)
For Ron :
.... (2)
Divide equation (2) by equation (1), we get
h' = 4 h
Thus, the statement of third student is wrong.
Answer:
Explanation:
Given
initial angular velocity is
when motor is turned of it started decelerating with angular acceleration
angle turned before coming to halt
here final angular velocity is zero
No of revolutions will be
Answer: b
. Natural selection is a process that brings about evolution
Explanation:
The natural selection can be defined as the differential survival and reproduction of the organisms that have better phenotypic traits which allow them to survive in their changing environment. These traits are passed on to the next generation this process is necessary for the evolution of the species. The evolution is the change in the structure and function of the organisms with the passage of them.