# physics

A passenger on a train notices that a 2.00 kg mass is displaced 10.0° from the vertical as the train
accelerates. (a) What is the acceleration of the train? (b) What would the acceleration be if the
mass was 5.00 kg?
c. What would angle have to be to indicate a horizontal acceleration equal to the
acceleration of gravity?
d. Could the acceleration ever be great enough to have the angle be 90.0° -- that is,
have the cord suspending the mass be horizontal? Explain.

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1. a. tan10=a/g

b. same

c. 45 deg

d. what is the tangent of 90 deg?

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2. I am confused with c where did the 45 degrees come from

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3. and also how do you know to use the tan of 10

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