The reflected ray is rotated through 12°.
<h3 /><h3>What is reflection?</h3>
Freflection can be defined as the turning back of a ray of light when its strikes a plane's surface.
There are 2 laws of reflection
<h3>Laws of reflection</h3>
(1) The first law of reflection states that the incident ray the reflected ray and the normal all at the point of incidence lie in the same plane
(2) The second law of reflection states that the angle of incident is equal to the angle of reflection.
From the question, if the incidence ray is rotated through 6°, then the reflected ray is rotated through 12°
Hence, The reflected ray is rotated through 12°.
Answer:
Explanation: pressure = force / area
Rearrange to get: force = pressure x area. 900 cm2 = 0.09 m2
force = 90 x 0.09
= 8.1 N
Answer:
v2 = 27.3m/s
Explanation:
Assuming forward as positive.
Mass = m1 = 64kg
Let v be the common velocity of the student and the skateboard.
mass of skateboard = m2 = 5.94kg
v = 1.4m/s
Since the skateboard and the student are initially moving together at the same velocity their momentum together is
(m1 + m2)v
Let the final velocity of the student be v1 and the final velocity of the skateboard be v2
v1 = – 1.0m/s (falls backwards that's why the velocity is negative since we are assuming forward as positive)
Then from conservation of momentum, momentum before is equal to momentum after.
(m1 + m2)v = m1v1 + m2v2
m2v2= (m1 + m2)v – m1v1
v2 = ( (m1 + m2)v – m1v1)/m2
v2 = ( (64 + 5.94)×1.4 – 64×(-1.0))/5.94
v2 = ( (64 + 5.94)×1.4 + 64×1.0)/5.94
v2 = 27.3m/s
There's no information to describe the DIRECTION of the motion
at any time, so I'll have to work with speed instead of velocity.
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Average speed = (total distance covered) / (time to cover the distance)
Distance covered in the first 8 seconds = 60 meters)
Distance covered in the middle 16 seconds = 240 meters
Distance covered in the last 21 seconds = 157.5 meters
Total distance covered = 457.5 meters
Time to cover the distance = 45 seconds
Average speed = (457.5 meters) / (45 seconds) = 10.17 m/s .
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Average acceleration = (change in speed) / (time for the change)
Speed at the beginning = 0
Speed at the end = 0
Change in speed = 0
Time for the change = 45 seconds
Average acceleration = 0/45 = 0 .