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Physics210Exam1Fall20201.pdf

Physics 210 Exam 1 Dr. Kotowich

Direct ions: Answer all quest ions. Give comple te solut ions and show all w o r k including units. I f uni ts are

not present the answer is incorrect . Good luck.

1)

b)

°

2)

Amiss i l e f i red f rom a j e t takes off f r o m the w i n g w i t h an accelerat ion of 500 m/s? t h a t lasts f o r 3

s. The jet 's ve loc i ty is 500 m/s due east. (Neglect the accelerat ion due t o gravity)

Wha t are the posi t ion and veloci ty o f the missile as observed by the j e t p i lo t 2s a f te r i t is f i red?

Wha t are the posi t ion and veloci ty o f the missile as observed by a person on the ground2 after

it is f ired.

Plot the posi t ion vs t i m e f o r the missile in the 3s as seen f r o m the observer on the ground.

A baseball is t h r o w n toward a player wi th an initial speed of 20 m/s a t an angle o f 45 degrees

w i t h t h e horizontal. At the m o m e n t the ball is t h rown , the player is 50 m f rom the th rower . A t

wha t speed and in wha t d i rec t ion must he r u n t o catch the ball at the same height at wh i ch it

was released?

3) A t r a i n starts f r o m a sta t ion wi th cons tan t accelerat ion o f 0.40 m/s?. A passenger arrives a t the

track 6 s a f te r the end o f the t ra in lef t the very same poin t .

a) W h a t is the slowest cons tan t speed at wh i ch she can run and catch the tra in?

b) Sketch curves f o r the m o t i o n of the passenger and the t ra in as funct ions o f t ime. Show the

t i m e and pos i t ion coord inates on the graph.

4) A g u n shoots bullets t h a t leave the muzzle a t 250 m/s. I f the bul let is t o hi t a ta rget 100 m away

at the level of the muzzle, the gun must be a imed at a po in t above the target.

a) W h a t angle should the gun be posi t ioned t o the hor izontal t o hi t the target?

b) How far above the target should the gun be a imed so the bul let hits the target at the level of

the muzzle?