A vehicle ___________ occurs when the driver begins to back up and is unaware that a person is behind the vehicle.
2 answers:
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Answer:
The period of the pendulum measuring 16 m is double that of the 4 m pendulum.
Explanation:
Recall that the period (T) of a pendulum with length (L) is defined by:
where "g" denotes the local gravitational acceleration.
Since both pendulums are positioned at the same location, the value of "g" will be consistent for both, and when we compare the periods, we find:
Thus, the duration of the 16 m pendulum is two times that of the 4 m one.
Answer:
The time required is 20 μs
Explanation:
Here is the data provided:
temperature = 20°C = 293 K
radius = 1 cm
atomic mass of air = 29 u
To determine
the duration for air to refill the vacuum space
solution:
We calculate the root mean square velocity of air particles. This can be expressed as:
where m indicates mass, t is temperature, v is speed, and R is the ideal gas constant, which is approximately 8.3145 (kg·m²/s²)/K·mol.
v = ............................1
v =
Resulting in v = 501.99 m/s.
<pNow, to cover the distance of 1 cm,<pThe duration needed for air is calculated as:time taken =
which gives us:
time taken =
so, time taken = 19.92 × seconds = 20μs.
Thus, the required time is 20 μs.