Answer:
Explanation:
The velocity of an object relative to a system
, the velocity of that system 
and the velocity measured by an observer at rest 
are related by the following equation:
In this case, the object is the boat, the system is the water and we are finding the velocity measured by an observer at rest. So, the formula becomes:
In words, the velocity of the boat relative to an observer standing on either bank, is 18.0km/h.
Answer:
V2 = -25.93 m/s
Explanation:
First of all, we know that;
Momentum = mass x change in velocity
Thus;
Momentum = m(v2 - v1)
Also, we know that;
Impulse = force x time
And also that;
Momentum = Impulse
From the question, m = 0.145kg and V1 = 32m/s while impulse = -8.4 N.s
Thus;
0.145(v2 - 32) = -8.4
Now,
0.145v2 - 4.64 = -8.4
0.145v2 = -8.4 + 4.64
0.145v2 = -3.76
v2 = -3.76/0.145
= -25.931 m/s and to two significant figures gives -25.93 m/s
Technically you can go forever on and on, but maybe your question was like how many rotations in a certain distance?
The temperature rises during boiling.
<em>Answer: </em>
1. The <em>"contour interval'</em> identifies the standard difference in elevation on a topography graph. It shows the difference in elevation of highest and lowest points on a topography map. In topographic map every fifth contour line is drawn, wider than the contour lines, called as contour index.
2. Geologist usually study all the materials that make up the earth. He can focus on different rock samples from earth's surface. the geologist works to understand history of the planet where we live on, to predict the future by explaining current occurrences.
3. The difference between the top of the plateau and the lowest point in the area of 250 m measurement is called <em>elevation. </em><em>Elevation is the highest point in the area.</em>
<em>4. </em>Damage from earthquakes is determined by <em>"Ritcher scale"</em>. Seismic waves are the vibrations occurs from earthquakes that can travel through the earth. These vibrations can be detected by the Ritcher scale.
