Answer:
19m/s
22.3 degrees
Explanation:
it is a case aof relative velocity.
the basic for relative velocity vector equation is :
V_b = V_j + V_(b/j)---------------1
V_b: ball velocity relative to ground
V_j : Jaun velocity relative to ground
V_(b/j): ball velocity relative to jaun
<u>reference frame:</u>
<u>We take east and north as +ve x and +ve y </u>
V_(b/j) = V_b - V_j
so for x-axis;
net x-component of V_(b/j) = 12 sin (37) + 0 = 7.22m/s
net y-component of V_(b/j) = 12 cos (37) + 8 = 17.6m/s
magnitude = ((7.22^2)+(17.6^2))^(0.5) = 19 m/s
<em>*direction with respect to Jaun = angle between the vertical (North) and vector </em>V_(b/j)
<em><u>angle = arctan(7.22/17.6) = 22.3 degrees</u></em>
Answer:
Explanation:
The distance from Dallas to Houston is 362,000 meters:
Tom drives with an average speed of:
Then, knowing these values, you can use the following formula in order to find the time "t":
Therefore, substituting values into the formula, you get:
Rounded to the the hundredths place:
Zebra coloration - the coloration makes it harder for predators to spot.
Answer:
140.04 m from the stop.
Explanation:
We can divide the motion in two parts:
First, we have an uniformly accelerated motion, using the following formula we calculate the distance traveled in this part:
In the second part, the car decelerates, but we don't know the value of this deceleration. We have to calculate the time spend in the first part, in order to know the time spend on second part:
Recall that total time is 15 s
Now, we calculate the deceleration:
Finally, we find the distance traveled in the second part. In this way, we can know how far does the car travel.