UTA Physics 1441 Exam 1 UPDATED
Exam Questions and CORRECT Answers
A friend asks to borrow your precious diamond for a day to show her family. You are a bit
worried, so you carefully have your diamond weighed on a scale which reads 1.17ct. The scale's
accuracy is +-0.05ct. The next day you weigh the diamond at 1.09ct. Is this your diamond based
on the scale readings?
A-Yes
B-No - CORRECT ANSWER - Yes, B/C the scale is accurate to .05 therefore the diamond
could be between 1.04 and 1.14 from the 2nd reading and 1.12 and 1.22 from the 1st reading.
12.40 x 10^2 + 3.14 x 10^2 + 0.0031 x 10^5 = ?
A. 1.55 x 10^3
B. 1.6 X 10^3
C. 1.86 X 10^3
D. 1.9 X 10^3 - CORRECT ANSWER - C. 1.86 x 10^3 because in addition or subtraction
you keep the smallest number of decimal places
Does the displacement of an object depend on the specific location of the origin in the coordinate
system?
A- Yes
B- no
c- all above are possible - CORRECT ANSWER - b. No
The displacement is the difference between two coordinates, thus the origin doesn't matter
If the velocity of a car is non-zero, can the acceleration be zero?
A-yes
B- No - CORRECT ANSWER - A Yes
An object moving with a constant velocity will have a slope = 0 therefore acceleration is equal to
zero
, Calculate the total stopping time for an initial velocity of a 50km/hr (14 m/s) and assume the
deceleration of the car is -6.0 m/s^2 and reaction time is 0.50s.
A- 3.3s
B. 2.8s
C. 2.3s
D. 1.8s - CORRECT ANSWER - B. 2.8s
braking time =
t=(vf-vi)/a or (0-14) / -6.0 = 2.3
2.3 + 0.5 = 2.8s
Alice and Bill are at the top of a cliff of height H. Both throw a ball with initial speed v1. Alice
straight down and bill straight up. the speeds of the balls when they hid the ground are va and vg.
If there is no air resistance, which is true?
A. va<vg
B. va=Vb
C. va>vb
D. depends on H - CORRECT ANSWER - B. va=vb
Bills ball goes up and comes back down to Bill's level with same Vi (initial velocity) as Alice's
ball.
You are adding vectors of length 20 and 40 units. What is the only possible resultant magnitude
in units that you can obtain out of the following choices?
A. 0
B. 18
C. 37
D. 64 - CORRECT ANSWER - C. 37
The minimum resultant occurs when the vectors are opposite, and the maximum resultant occurs
when the vectors are aligned. (the minimum would be 40-20=20 and the max would be
20+40=60 therefore 37 is in between so it is the answer)
Exam Questions and CORRECT Answers
A friend asks to borrow your precious diamond for a day to show her family. You are a bit
worried, so you carefully have your diamond weighed on a scale which reads 1.17ct. The scale's
accuracy is +-0.05ct. The next day you weigh the diamond at 1.09ct. Is this your diamond based
on the scale readings?
A-Yes
B-No - CORRECT ANSWER - Yes, B/C the scale is accurate to .05 therefore the diamond
could be between 1.04 and 1.14 from the 2nd reading and 1.12 and 1.22 from the 1st reading.
12.40 x 10^2 + 3.14 x 10^2 + 0.0031 x 10^5 = ?
A. 1.55 x 10^3
B. 1.6 X 10^3
C. 1.86 X 10^3
D. 1.9 X 10^3 - CORRECT ANSWER - C. 1.86 x 10^3 because in addition or subtraction
you keep the smallest number of decimal places
Does the displacement of an object depend on the specific location of the origin in the coordinate
system?
A- Yes
B- no
c- all above are possible - CORRECT ANSWER - b. No
The displacement is the difference between two coordinates, thus the origin doesn't matter
If the velocity of a car is non-zero, can the acceleration be zero?
A-yes
B- No - CORRECT ANSWER - A Yes
An object moving with a constant velocity will have a slope = 0 therefore acceleration is equal to
zero
, Calculate the total stopping time for an initial velocity of a 50km/hr (14 m/s) and assume the
deceleration of the car is -6.0 m/s^2 and reaction time is 0.50s.
A- 3.3s
B. 2.8s
C. 2.3s
D. 1.8s - CORRECT ANSWER - B. 2.8s
braking time =
t=(vf-vi)/a or (0-14) / -6.0 = 2.3
2.3 + 0.5 = 2.8s
Alice and Bill are at the top of a cliff of height H. Both throw a ball with initial speed v1. Alice
straight down and bill straight up. the speeds of the balls when they hid the ground are va and vg.
If there is no air resistance, which is true?
A. va<vg
B. va=Vb
C. va>vb
D. depends on H - CORRECT ANSWER - B. va=vb
Bills ball goes up and comes back down to Bill's level with same Vi (initial velocity) as Alice's
ball.
You are adding vectors of length 20 and 40 units. What is the only possible resultant magnitude
in units that you can obtain out of the following choices?
A. 0
B. 18
C. 37
D. 64 - CORRECT ANSWER - C. 37
The minimum resultant occurs when the vectors are opposite, and the maximum resultant occurs
when the vectors are aligned. (the minimum would be 40-20=20 and the max would be
20+40=60 therefore 37 is in between so it is the answer)
