Answer:
The correct answer is option b.
Explanation:
In velocity vs time graph, vertical axis represent velocity vector and horizontal axis represents time. The slope of the line obtained in this graph is equal to the acceleration.
- If the line is straight makes an acute angle with horizontal axis then it is considered as positive acceleration.
- If the line is straight makes an obtuse angle with horizontal axis then it is considered as negative acceleration or deceleration.
Answer:
Atmospheric Refraction is the bending of light rays when they pass through the layers of earths atmosphere
Explanation:
Hope this helps
Answer:
Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
Explanation:
Answer:
B The force that the floor of the elevator exerts on you and the force that you exert on the floor of the elevator
Explanation:
A. is incorrect because the force of gravity on you will always stays the same while the force of the elevator exerts on you changes as it takes you upward
B. is correct in accordance to Newton's 3rd law of action and reaction forces.
C. is incorrect because gravity force stays the same while the force that you exerts on the floor change as elevator moving upward.
D. is incorrect although it states Newton's 1st law. However there can still be pair of forces (part B) that could counter balance each other among other forces.
Answer:
Explanation:
The equation of the position in kinematics is given:
- x(0) is the initial position, in this it is 0
- v(0) is the initial velocity (20 m/s)
- a is the acceleration (2 m/s²)
So the equation will be:
Now, the Taylor polynomial equation is:
Using our position equation we can find f'(t)=v(t) and f''(x)=a(t). In our case a=0, so let's find each derivative.
Using the Taylor polynomial with a = 0 and take just the second order of the derivative.
Let's put t=1 so find the how far the car moves in the next second:
Therefore, the position in the next second is 21 m.
We need to know if the acceleration remains at this value to use this polynomial in the next minute, so I suggest that it would be reasonable to use this method just under this condition.
I hope it helps you!
