an object has an acceleration of 12 m/s/s. if the mass were doubled then what is the new acceleration?
1 answer:
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Answer:
Pi(3.14) radians or 180º degrees
Explanation:
First of all, we need to obtain the wavelength of a wave traveling to the speed of sound and 420 Hz of frequency.
The formula is:
where l = wavelength in meters
With current values:
l = 336 [m/s]/420[1/s] = 0.8 meters
Since a complete cycle (360º or 2pi radians) needs 0.8 meters to complete, 0.4 meters or 40 cm is just half of it, making a 180º degree phase or 3.14 radians.
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