That's <em>false</em>. Visibility has nothing to do with weight.
Carbon Monoxide, Carbon Dioxide, Hydrogen Sulfide, Nitrogen, Oxygen, Methane, water vapor, and a bunch of other gases are invisible, but they all have plenty of weight.
<u><em>Air</em></u> is invisible. If your bedroom is, say, 12-ft long, 10-ft wide, and 7-ft high, then the air inside your room weighs around 65 pounds !
Option D,Plate Tectonics
In the rock cycle, surface events takes place at the surface of earth. Thus,
weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.
Answer and Solution:
As per the question:
The particle's displacement is given by the expression:
Now,
(a) The average velocity is given as the ratio of the displacement of the particle to the time interval:
Now, displacement in the interval:
i) [3,4]
At t = 3 s
At t = 4 s
ii) [3.5, 4]
At t = 3.5 s
At t = 4 s
iii) [4, 5]
At t = 4 s
At t = 5 s
iv) [4, 4.5]
At t = 4 s
At t = 4.5 s
(b) The instantaneous velocity at t = 4 s is given by:
At t = 4 s
Answer:
2403 m/s^2
Explanation:
The gravitational potential energy of the froghopper when it reaches the maximum height is equal to the kinetic energy at the moment of takeoff:
where
m = 12.7 mg is the mass of the froghopper
g = 9.8 m/s^2 is the acceleration due to gravity
h = 49.8 cm = 0.498 m is the maximum height reached
v = ? is the take-off velocity
Solving for v, we find
We now that the froghopper accelerates from
u = 0 m/s
to
v = 3.1 m/s
in a distance of
d = 2.00 mm = 0.002 m
So we can find the acceleration by using the following SUVAT equation:
Solving for a,
I know that the answer is 3 because 1+2 is 3