Answer:
8.33 m/s
Explanation:
v=d/s, velocity = displacement/ time
The displacement is a vector that is calculated by subtracting the final and initial positions of an object that has made a movement.
We know that initially the object was at the origin and moved to the -8m position.
Suppose that the movement was made on the x-axis. So:
d = [-8 - (0)]x
d = -8x
Regarding the second question.
When the acceleration is constant then the speed changes at a constant rate. Therefore the graph of velocity vs. time will look like a line with a negative slope (if the acceleration is negative) or a line with a positive slope (if the acceleration is positive)
For example. Suppose that the acceleration of gravity is 10
Now suppose you drop an object from a building.
At the initial moment (second 0) the speed is 0 m/s.
After 1 second the speed of the object will be 10 m/s.
After 2 seconds the speed of the object will be 20 m/s.
After 4 seconds the speed will be 40 m/s.
The graph of this example is shown in the attached figure. Note that it is a straight line.
Answer:
u = 6.667 cm
Explanation:
given,
Focal length of the concave mirror, f = 20 cm
magnification factor = 1.5
we know,
v is the distance of the image
u is the distance of the object
v = -1.5 u
Using mirror formula
u = 6.667 cm
distance of the person from the mirror is equal to 6.667 cm.
Answer:
Fusion is the change of phase from: solid to liquid.
Explanation:
Fusion is defined as change of of a substance from solid state to liquid state.Also known as melting.
Solid → liquid (Fusion)
Vaporization is defined as change of of a substance from liquid state to gaseous state.
liquid → gas (vaporization)
Freezing is defined as change of of a substance from liquid state to solid state.
liquid → solid (solidification)
Deposition is defined as change of of a substance from gaseous state to solid state.Also known as melting.
Gas→ solid (deposition)
Sublimation is defined as change of of a substance from solid state to gaseous state.Also known as melting.
Solid → gas (sublimation)
Condensation is defined as change of of a substance from gaseous state to solid state.Also known as melting.
Gas→ liquid (Condensation)
Answer:
Group 18 elements are noble gasses which are stable. They have a full valence shell so they are don't typically react too much. Group 17 only needs one more valence electron so these are most often paired with group 1 elements. Group 17 are Halogens and most often react with Alkali metals. Example: NaCl (Na group 1 | Cl group 17)
Explanation: