A light ray passing from medium 1 to medium 2 is bent away from the perpendicular normal to the boundary surface. What happens t
2 answers:
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Answer:
a) 1111.0 seconds
b) 833.3 s
c) Because of proportions
Explanation:
a) Total time of round trip is the sum of time upriver and time downriver
Time upriver is calculated with the net speed of student and 0.500 km:
(Becareful with units 0.5 km= 500m) Similarly of downriver:
So the sum is:
b) Still water does not affect student speed, so total time would be simply:
c) For the upriver trip, student moved half the distance in half speed of the calculation in b), so it kept the same ratio and therefore, same time. So the aditional time is actually the downriver.
Answer:
(a) Magnitude of seat force at lowest point = 678 + 92 = 770
(b) Force exerted by the seat (highest point) = 310 N
(c) Force exerted by seat (lowest point) = 1046 N
Explanation:
At the highest point the magnitude of force by the seat = 586 N
The weight of the student = 678 N
Thus, at the highest point, the difference in this force is due to the centrifugal force acting on the boy. This can be calculated as follows:
Centrifugal Force = 678 - 586 = 92 N
(a) The magnitude of force on the student by the seat at the lowest point will have to appose both the student's weight and centrifugal force acting towards the ground. This would mean:
Magnitude of seat force at lowest point = 678 + 92 = 770 N
(b) If the wheel's speed is doubled, the centrifugal force will change accordingly. The equation of centrifugal force is given below:
We can see from this that the force is directly proportional to the square of the velocity. So if the velocity is doubled, the centrifugal force increases four times.
So at the highest point the centrifugal force will decrease the force of weight acting on the seat. The seat force would then be:
Force exerted by the seat = Weight - Centrifugal force
Force exerted by the seat = 678 - (4 * 92)
Force exerted by the seat (highest point) = 310 N
(c) The force exerted by the seat at the lowest point will be the centrifugal force plus the weight.
This is:
Force exerted by seat = Centrifugal force + Weight
Force exerted by seat = (4 * 92) + 678
Force exerted by seat (lowest point) = 1046 N
Answer:
two objects must have accelerations of equal magnitude.
Explanation:
In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.
This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.
Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.
Mathematically, acceleration is given by the equation;
Where,
a is acceleration measured in
v and u is final and initial velocity respectively, measured in
t is time measured in seconds.
Acceleration constraint refers to a precise relationship between the acceleration of two physical objects.
An acceleration constraint says that in some circumstances two objects must have accelerations of equal magnitude.