Answer:15.66 J
Explanation:
mass of block 
Force magnitude=7.5 N
Initial velocity =
Final velocity=
Initial Kinetic Energy=
=
Final Kinetic Energy=
=
Work Done =Final -Initial Kinetic energy=37.714-22.056=15.66 J
Answer:
a. approximately
(first minimum.)
b. approximately
(first maximum.)
c. approximately
(second minimum.)
d. approximately
(second maximum.)
Explanation:
Let
represent the separation between the two speakers (the two "slits" based on the assumptions.)
Let
represent the angle between:
- the line joining the microphone and the center of the two speakers, and
- the line that goes through the center of the two speakers that is also normal to the line joining the two speakers.
The distance between the microphone and point
would thus be
meters.
Based on the assumptions and the equation from Young's double-slit experiment:
.
Hence:
.
The "path difference" in these two equations refers to the difference between the distances between the microphone and each of the two speakers. Let
denote the wavelength of this wave.
.
Calculate the wavelength of this wave based on its frequency and its velocity:
.
Calculate
for each of these path differences:
.
In each of these case, the distance between the microphone and
would be
. Therefore:
- At the first minimum, the distance from
is approximately
. - At the first maximum, the distance from
is approximately
. - At the second minimum, the distance from
is approximately
. - At the second maximum, the distance from
is approximately
.
Answer:
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
Answer:
Explanation:
Initial velocity is 0. In the equation v = v0+at where v0 is the initial velocity of 0, we only have to fill in -9.8 for a and 2 for t to get the velocity after 2 seconds -19.6 m/s; after 5 seconds, when it hits the ground, a = -9.8 and t = 5 to give a velocity of -49 m/s. Gravity pulls down everything at the same rate, it doesn't matter whether we drop a feather or an elephant from the window!
The answer is B. Domain
When the atoms point to the same direction and aligned with one another, It will form a magnetic material in which magnetization is in a uniform direction
This alignment usually happens stimunaleously due to exchange interaction that caused by a response to an external field.