Answer:
Yes
Explanation:
Element D will also burn in oxygen, because elements classified under same group has similar physical or chemical properties.
Hi there!
Acceleration = change in velocity / change in time = Δv/Δt
Thus:
a = (75 - 15)/4 = 60/4 = 15 mi/hr²
I think it would be sodium.
Because the atomic mass is protons + neutrons, so I did 6 + 5 = 11
Then I looked on the periodic table for an element with the atomic mass of 11 and it was Na... Sodium.
Now let’s say you’re on the Moon. If you were to drop a hammer and a feather from the same height, which would hit the ground first?
Trick Question! On the moon both objects would hit the ground at the same time. On Earth, the hammer lands first.
So yeah, the student is right. Galileo gave us this theory long ago.
The vertical position of the rock is given by:
where
h=75 m is the initial height
v0=20 m/s is the initial vertical velocity
g=9.81 m/s^2 is the acceleration due to gravity
The problem asks to find the time t at which the rock hits the ground, so the time t at which y(t)=0, so the equation above becomes:
Which has two solutions:
t=-2.37 s
t=6.45 s
The first solution is a negative time so it has no physical meaning, therefore the correct answer is t=6.45 s.
