Stratus
Cumulus
Stigform
Constant acceleration.
Decreasing acceleration.
Increasing acceleration.
Moving backwards at constant speed.
Moving forward at constant speed.
Stationary.
Answer:
AB: decreasing acceleration
BC: constant acceleration
CD: constant acceleration.
Explanation:
(1) Here is the plot of velocity and time.
There is no information of distance.
=> There are two options that will be eliminated.
Moving backwards at constant speed.
Moving forward at constant speed.
(2) Only for remaining options will be considered:
Constant acceleration.
Decreasing acceleration.
Increasing acceleration.
Stationary.
(3) The formula for calculating final velocity:
v_final = v_initial + acceleration x time
Let's see BC: (this is a segment straight line)
v_C = v_B + acceleration x time
v_C = v _B = 40 (km/h)
time > 0
=> acceleration a = 0 (km/h^2) => constant acceleration
Let's see CD: (this is also a segment straight line)
v_D = v_C + acceleration x time
v_D = 0 (km/h)
v_C = 40 (km/h)
time > 0
=> acceleration = -40/time (km/h^2) < 0 => constant (negative) acceleration
Let's see AB (a segment straight line + a right curve)
On the segment straight line:
Using the same way we considered CD,
the acceleration is constant (positive) acceleration
On the right curve (with direction from A to B), its slope started to decrease. This slope is the change of acceleration.
=> Generally on AB (considering both segment straight line and the right curve), the acceleration is decreasing acceleration
P.S: Take the derivative of v_final with respect to acceleration a, plot a as a function of time , then you will see what really happened ^^.
Hope this helps!
A. Magnetic
B. Friction
C. Electrical
D. Gravitational
Answer:
B. Friction
Explanation:
I just took the test & got it right :)
Answer:
Im not sure but it would most likely be Gravitational
Explanation:
The kinetic energy of the squirrel with a mass of 0.9 Kg running with a speed of 4 m/s is 7.5 J.
Kinetic energy of an object is a form of energy generated by virtue of the motion of the object. Kinetic energy is dependent on the mass and velocity of the body.
When a body starts to move its potential energy starts to convert to kinetic energy and the kinetic energy will be maximum at the highest speed. When the object slow down and pause in a position it gains potential energy again.
The kinetic energy KE = 1/2 mv²
Given mass = 0.9 Kg
velocity = 4 m/s.
KE = 1/2 0.9 Kg × 4² m/s
= 7.5 J
Therefore, the kinetic energy of the squirrel is 7.5 J.
To find more on kinetic energy, refer here:
#SPJ2
Answer:
A). Option A
B). Option B
C). Option B
Explanation: