a. Speed is defined as rate of change of distance per unit time whereas velocity is defined as rate of change of displacement per unit time.
b.
is the total time taken in the trip
c.
is the total distance
d.
towards right from the starting point.
e. 
f.
towards right.
Explanation:
a.
Speed is a scalar quantity while velocity is a vector quantity.
Speed is defined as rate of change of distance per unit time whereas velocity is defined as rate of change of displacement per unit time.
Speed is a directionless quantity while velocity constitutes direction.
b.
<em>Total time of round trip when we're given:</em>
- distance travelled to the right,

- speed while travelling to the right,

- time spent at gas station,

- time spent while travelling back towards the left,

- speed while travelling to the left,

<em>Now time taken for travelling towards right:</em>



<u>Therefore total time taken in the round trip:</u>



c.
<em>Now, distance travelled towards left:</em>



<u>Therefore total distance:</u>



d.
Now, total displacement:


towards right from the starting point.
e.
<u>Average speed:</u>



f.
<u>Average velocity:</u>


towards right.
Explanation:
Let us assume that moment about the pin and then setting it equal to zero as the rod is in equilibrium is as follows.
Moment = Force × Leverage

= 0

Therefore, we can conclude that the force (
) in the cable by assuming that the origin of our coordinate system is at the rod’s center of mass is 935.11 N.
Answer:
A. limestone
Explanation:
Limestone is usually a biological sedimentary rock, forming from the accumulation of shell, coral, algal, fecal, and other organic debris. It can also form by chemical sedimentary processes, such as the precipitation of calcium carbonate from lake or ocean water.
Answer:
It will increase by a factor of 8.
Explanation:
By Ohm's Law, we can relate current, voltage and resistance. It is expressed as V=IR. That is, there is a direct relationship between voltage and resistance and voltage and current.
V = IR
V1/2V1 = I1R1 / I2R1/4
1/2 = 4I1/I2
I2 = 8I1
Answer:
Y, X, Z, W
Explanation:
Jerome must put the given models in the order Y, X, Z, W to display the development of atom from the earliest to the most recent one. 'Y' represents 'Thomson's plum pudding model' came in 1904 which was followed by the 'Rutherford's nuclear atomic model' of 1911 as represented by X. This was succeeded by the 'Bohr's electrostatic model' in 1913(as shown in model Z) and lastly, the model W which exemplifies the 'Quantum Mechanical Model' by Edwin Schordinger in 1926. Thus, the correct order is <u>Y, X, Z, W</u>.