Answer:
Explanation:
It is a problem to find the torque but the force applied was performed angularly. In this way the only component that will serve us is the one found in the line of rotation of the object.
Since the force is realized from upward with respect to a line from the bolt through the end of the wrench, we have the component described by Sin (\ theta). The force is performed on the opposite side of the angle, then
Answer:
(a)
(b)
Explanation:
Given that , the power of the laser beam is,
and time is given is,
Now the energy formula for the laser beam is,
Now,
(a) The value of energy is given,
Now the no of photons's fraction fluctuation is,
Therefore the no of photons is .
(b)The value of energy is given,
Now the no of photons's fraction fluctuation is,
Therefore the no of photons is.
a) Let's call x the direction parallel to the river and y the direction perpendicular to the river.
Dave's velocity of 4.0 m/s corresponds to the velocity along y (across the river), while 6.0 m/s corresponds to the velocity of the boat along x. Therefore, the drection of Dave's boat is given by:
relative to the direction of the river.
b) The distance Dave has to travel it S=360 m, along the y direction. Since the velocity along y is constant (4.0 m/s), this is a uniform motion, so the time taken to cross the river is given by
c) The boat takes 90 s in total to cross the river. The displacement along the y-direction, during this time, is 360 m. The displacement along the x-direction is
so, Dave's landing point is 540 m downstream.
d) If there were no current, Dave would still take 90 seconds to cross the river, because its velocity on the y-axis (4.0 m/s) does not change, so the problem would be solved exactly as done at point b).
Answer:
hope this answer helps this is what I understand
