The horizontal motion has no effect on the vertical drop.
From a drop, the distance the ball falls in 'T' seconds is
D = 4.9 T^2
so
2.2 = 4.9 T^2
T^2 = 2.2/4.9
T^2 = 0.449 sec^2
T = 0.67 second
Scientific theories are not absolute and unquestionable truths: they are the best explanation of the data, but they can be challenged if new data is discovered or if a new theory is found that fits to and explains the data even better!
The best answer is d: this is not an accurate description of a scientific theory!
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Answer:
to create a magnetic field, which becomes stronger with an increase in the number of turns.
Explanation:
i jus read it
Answer:
1 ) 3.3 [s]; 2) 49 [m]; 3) 23[m/s]
Explanation:
1)
In this problem we can use the kinematic equations, first we must find the final velocity and the we can calculate the time.
Now using the following equation, we can find the time:
Note: The acceleration is positive because the gravity is acting in the same direction towards the movement.
2)
In this problem, we must identify each of the initial data and then using the ideal kinematic equation we will find the answer.
x0= the initial position = 7[m]
v0= the initial velocity = 5 [m/s]
t = time = 3 [s]
a = acceleration = 6[m/s^2]
x = the final position, after the 3 [s]
Now replacing:
3 ) Is the same problem that problem 2, but we must use another equation.
vf=final velocity [m/s]
v0= initial velocity [m/s] = 5 [m/s]
t= time = 3 [s]
Answer:
viscosity = 0.051725 N/m-s
Explanation:
Given data
diameter = 0.3 m
u(r) = 0.4/r - 1000r m/s
diameter d1 = 2 cm = 0.02 m
diameter d2 = 4 cm = 0.04 m
rotation = 500 rpm
power = 1 w
to find out
fluid viscosity
solution
we have given
u(r) = 0.4/r - 1000r m/s
du/dr = -0.4/r² + 1000
here r = 0.3 /2 = 0.01 m
du /dr = -0.4/(0.01)² + 1000
du/dr = 5000
and
so velocity is
force = viscosity ( 2π×r×L) du/dr
0.026 / 0.02 = viscosity ( 2π× 0.02×0.04) 5000
viscosity = 0.051725 N/m-s