1) Let's call
the speed of the southbound boat, and
the speed of the eastbound boat, which is 3 mph faster than the southbound boat. We can write the law of motion for the two boats:
2) After a time
, the two boats are
apart. Using the laws of motion written at step 1, we can write the distance the two boats covered:
The two boats travelled in perpendicular directions. Therefore, we can imagine the distance between them (45 mi) being the hypotenuse of a triangle, of which
and
are the two sides. Therefore, we can use Pythagorean theorem and write:
Solving this, we find two solutions. Discarding the negative solution, we have
, which is the speed of the southbound boat.
Answer:
C) Venus is closer to the Sun than Saturn is.
Explanation:
This is the right answer.
Because acceleration was constant throughout the slide, we can show the slide lasted
Also because accleration was constant, we know the average velocity of the book was
Average velocity is also given by
so the width of the desk must have been
which means C is the most likely answer.
<span>The erratum in this sentence is that clothes are removed from the water by the action of centripetal force. The holes in the washing machine drum enables the clothes to move along the circular path. The holes also enable the water to escape from the machine and pushes the water to move alon gthe circular motion as well. While there is motion, the holes keep the clothes moving inward.</span>
Answer:
c. The less massive object will have less momentum if the velocities are the same.
Explanation:
p = mv
If the velocities are the same, p ∝ m, so the less massive object will have less momentum.
a. is wrong. If the masses are equal, p ∝ v, so the object with the higher velocity will have the greater momentum.
b. is wrong. If an object has both more mass and a greater velocity, it will have the greater momentum.
d. is wrong. If the velocities are the same, the more massive object will have more momentum.