Please answer these questions with explanations. Idon’t know if my answers are c

Question

Please answer these questions with explanations. Idon’t know if my answers are correct or not.

Sample Exam 1 - PHYS211- Midterm 1 - Spring 2018 15 As an astronaut visiting the Planet X, you're assigned to measure the free-fall acceleration. Getting out your meter stick and stop watch, you time the fall of a heavy ball from several heights. You send your data to your shipmates, who remember you want a linear fit to the data but can't remember how to plot it to get that. So they plot it three different ways, and give you the equations of the linear fits for each at the right: 2.5 =0.51+0 2.0 (:)0.2 )+0.5 - G1.5 1.0 0.5 = 0.11 +0.75 vt vs h Height [m] What is the gravitational acceleration on Planet X? .A. 0.1 m/s2 0.2 m/s2 0.5 m/s E. 10 m/s 0

Explanation / Answer

Ans 15.

As we know that equation of line is given by

Y = mx + c,

So the equation

(t/s) = 0.2 (h/m) + 0.5 is the best match.

As we also know at maximum height velocity is zero and accelerations is maximum.

Differentiate this equation (y = MX + c) with respect to x gives us

dy/dx = M = 0 ( so we have m = 0 Then it should become,

y = C

Comparing it with main equation

c = 0.5 m/s²

13. Your answer and explanation in this is correct.

14. Here i stand for x axis and j stand for y axis. In the question i is positive and j is negative. So this value where x is positive and y is negative.

Therefore it lies on the IV quadrant. And it is clockwise.

Option C is correct

1

So this is basically a time of flight inprojectile motion concept. Time of flight Is the total time taken by an object from initial position to the final position (in air)

Therefore time of flight in projectile motion is given by

T = (2 u sin #thetha)÷g

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