Answer:
true.
Explanation:
z-score gives an idea of how far the value of data is from the mean point. Basically is the measure of a standard deviation below or above the mean.
More the deviation of the data from the mean more is the standard deviation.
Z-score or value is calculated by the expression given below:

x is the value
μ is the mean
σ is the standard deviation
Hence, the statement given is true.
Answer:
vi = 14.610
Explanation:
initial velocity of the first object (vi) = 0 m/s, because it was dropped
distance (y) = -20 m
initial position (y0) = 0 m
acceleration due to gravity (g) = -9.8 m/s^2
y = 1/2 gt^2 + vi*t + y0
-20 = 1/2(-9.8)t^2 + 0 + 0
-20 = -4.9t^2
4.081 = t^2
+√4.081 = t
t = 2.020
time of second object = 2.020 - 1 = 1.020
Now we can plug in the new time to solve for vi of the second object.
y = 1/2 gt^2 + vi*t + y0
-20 = 1/2(-9.8)1.020^2 + vi*1.020 + 0
-20 = -5.098 + 1.020vi
14.902 = 1.020vi
vi = 14.610 m/s
Answer:
b. It is subject to a net force of zero
Explanation:
F = m*a
F = force
m = mass
a = acceleration
Since the object is moving at a constant velocity not speeding up or slowing down and moving in a sight line. All the forces that are acting on the object are canceling each other out so the answer is:
b. It is subject to a net force of zero
Answer:

Explanation:
As we know that the force due to propeller when it will push the water backwards is given as

now we know that

so we have



here we know that



now the force is given as


now the acceleration of the ship is given by Newton's II law



<span>Solids are denser than liquids, and liquids are denser than gases at room temperature. </span>