Please help me
1 answer:
Answer:
Microwave takes 13.67μs to travel from cell phone to tower
Explanation:
Given data:
Distance traveled by microwave from cell phone to tower =
We know that the microwave is an electromagnetic wave and the velocity v of electromagnetic wave is 3 x m/s.
In general, to determine time of travel from distance and velocity given, we divide distance traveled by velocity. That is
Velocity =
Hence, time =
Therefore, time of travel of microwave =
=
= 13.67 x s
= 13.67 μs (μs is microseconds)
Hence microwave takes 13.67μs to travel from cell phone to tower.
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- Raindrops will fall faster . .
- Also walking on ground would become more difficult as g increases.
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- So time period of simple pendulum would decrease.
Answer:
Train accaleration = 0.70 m/s^2
Explanation:
We have a pendulum (presumably simple in nature) in an accelerating train. As the train accelerates, the pendulum is going move in the opposite direction due to inertia. The force which causes this movement has the same accaleration as that of the train. This is the basis for the problem.
Start by setting up a free body diagram of all the forces in play: The gravitational force on the pendulum (mg), the force caused by the pendulum's inertial resistance to the train(F_i), and the resulting force of tension caused by the other two forces (F_r).
Next, set up your sum of forces equations/relationships. Note that the sum of vertical forces (y-direction) balance out and equal 0. While the horizontal forces add up to the total mass of the pendulum times it's accaleration; which, again, equals the train's accaleration.
After doing this, I would isolate the resulting force in the sum of vertical forces, substitute it into the horizontal force equation, and solve for the acceleration. The problem should reduce to show that the acceleration is proportional to the gravity times the tangent of the angle it makes.
I've attached my work, comment with any questions.
Side note: If you take this end result and solve for the angle, you'll see that no matter how fast the train accelerates, the pendulum will never reach a full 90°!
