Answer:
B. Gravity and air resistance
Explanation:
Experimentation has proven that :
When the parachute opens, air resistance becomes much greater than gravity. The forces are no longer balanced and this changes the
speed
Answer:
6.49707626552 m/s
4.45147808359 m
1.46212197842 s
Explanation:
t = Time taken
u = Initial velocity
v = Final velocity
s = Displacement
a = Acceleration
g = Acceleration due to gravity = 9.81 m/s²
The speed with which Sam releases the ball is 6.49707626552 m/s
The ball reaches a height of 2.3+2.15147808359 = 4.45147808359 m
Distance to his head from the maximum height is 4.45147808359-1.83 = 2.62147808359 m
Time taken to go down to his head is 0.731060989212 seconds from the maximum height
Time taken from the moment the ball left his head height = 0.731060989212+0.731060989212 = 1.46212197842 s
Answer:
As the locomotion of organisms depends upon the interchange of kinetic and potential energy, animals that walk upright and have a higher centre of mass will be able to propel themselves higher compared to a shorter animal with each step. Physically, Energy can be written as1/2 mtotal ( ucm² + vcm² + wcm²)+1/2mi {u1-ucm)²+(v1-vcm)²+(w1-wcm)²} + mgh. Where ucm, vcm, wcm are the velocities of centre of mass of each portion.u1,w1,v1 are the velocities of different parts of body relative to COM
Hypothesis 2
Similarly, for the animals having lower centre of mass we can say that they will be better at climbing and traversing trees. An animal with low centre of mass will be able to get maximum traction with tree and it will be harder for it to lose its balance. Hence animals like leopard, sloth, gecko, Red panda etc. all showcase this lower centre of mass. These animals gravitational potential energy is minimum when all feet are on the ground and maximum when the body is raised high above
Their motion can be written in the form dr/dl = -r/2l where r can be written as radius of the torso of the animal. L is length of animals body.
Explanation:
As the distance from the Sun increases the time to orbit the Sun increases. <em>(a)</em>
Examples:
-- Nearest planet to the sun: Mercury. Time to orbit the sun: 88 days
-- 3rd planet from the sun: Earth. Time to orbit the sun: 1 year
-- 5th planet from the sun: Jupiter. Time to orbit the sun: 12 years
-- 9th closest object to the sun: Pluto. Time to orbit the sun: 248 years
Another pair of examples:
-- Object in a near Earth orbit: International Space Station
Time to orbit the Earth: 90 minutes
-- Object in a far Earth orbit: the Moon
Time to orbit the Earth: 27.3 days
The reason for all of this is: Two things about orbits.
1). The larger the orbit is, the farther the object has to travel around it.
2). The farther out the object is, the slower it travels in its orbit.
This is simply the way gravity works.
Artistic self because it says by drawing his favorite things hope this helps