Answer:
A) a_c = 1.75 10⁴ m / s², B) a = 4.43 10³ m / s²
Explanation:
Part A) The relation of the test tube is centripetal
a_c = v² / r
the angular and linear variables are related
v = w r
we substitute
a_c = w² r
let's reduce the magnitudes to the SI system
w = 4000 rpm (2pi rad / 1 rev) (1 min / 60s) = 418.88 rad / s
r = 1 cm (1 m / 100 cm) = 0.10 m
let's calculate
a_c = 418.88² 0.1
a_c = 1.75 10⁴ m / s²
part B) for this part let's use kinematics relations, let's start looking for the velocity just when we hit the floor
as part of rest the initial velocity is zero and on the floor the height is zero
v² = v₀² - 2g (y- y₀)
v² = 0 - 2 9.8 (0 + 1)
v =√19.6
v = -4.427 m / s
now let's look for the applied steel to stop the test tube
v_f = v + a t
0 = v + at
a = -v / t
a = 4.427 / 0.001
a = 4.43 10³ m / s²
Answer:
R = 2Ω
Explanation:
Potential difference (V) = current (I) * Resistance (R)
V = IR
I = 2.0A
V = 10v
R = ?
V = IR
R = V / I
R = 10 / 2
R = 2Ω
The resistance across the wire is 2Ω
Answer:
Energy, 
Explanation:
It is given that,
Mass of matter, m = 1 g = 0.001 Kg
If this matter is completely converted into energy, we need to find the yield. The mass of an object can be converted to energy as :

c = speed of light


So, the energy yield will be
. Hence, this is the required solution.
Answer:
15 km/s from the starting point
Explanation:
Velocity is total distace divided by total time.
From the picture, you can see that line consecutively traveled 30 kilometers- in 2 seconds.
(9 to 11 is two seconds, unless I'm wrong.)
So, total distance = 30 km. Total time = 2 seconds.
30/2 is 15.
the velocity of line A is 15 km/s from the starting point.
Answer:
green tea
Explanation:
According to the question
It is mentioned that
dilute green tea 9.0,
alkaline water 8.0,
fruit juice 6.8,
vinegar 3.5,
and Gatorade 3.0
Now based on the above information
As it can bee seen that the Dilute green tea contains higher pH as compared with the others
So, the substance that have a bigger or higher pH is green tea