UTA PHYS 1441 Exam 1 and 2
Questions and Answers12
A net force of 200 N acts on a 100-kg boulder, and the same net force acts on a 130-g pebble.
How does the rate of change of the boulder's momentum compare to the rate of change of the
pebble's momentum?
A- they are equal
B- the boulder's is less than the pebble's
C- the boulder's is greater than the pebble's
D- can't determine - ANSWERSA- they are equal
A 30 kg crate was pulled 40m along a horizontal floor by a constant force Ff=100N, which acts at
a 37* angle to the horizontal direction. The floor exerts a constant friction force Ffr=40N.
Determine the work done on the crate.
A- 800J
B- 1600J
C- 1200J
D- 2400 J - ANSWERSB- 1600J
A 1400 kg car accelerates from the rest to 30 m/s in 7s with a retarding force of 500N. What is
the average power delivered by the engine during this constant acceleration process?
A- 12x10^2W
B- 9.8x10^2W
C- 9.0x10^2W
D- 7.5x10^W - ANSWERSB- 9.8x10^2W
, Which of the following forces is a conservative force?
A- gravitational force
B- electric force
C- elastic force
D- all of the above - ANSWERSD- all of the above
What, approximately, is the percent uncertainty for the measuerment 1.00 m?
A- 0.01%
B - 0.1%
C - 1%
D - 10% - ANSWERSC - 1%
If the acceleration of a car is non-zero (a>0) what is the velocity of the car?
A- 0 m/s
B- -10 m/s
C- 10 m/s
D- All of the above - ANSWERSD- All of the above
Which of the following graphs denote(s) the sum of two vectors, VA=V1+V2
A - not a triangle
B- triangle end to end
C- triangle not end to end
D- obtuse triangle - ANSWERSA- not a triangle
Given that A+B=C and [A] + [B] = [C] denotes magnitude of the vector, how are vectors A and
oriented with respect to each other?
Questions and Answers12
A net force of 200 N acts on a 100-kg boulder, and the same net force acts on a 130-g pebble.
How does the rate of change of the boulder's momentum compare to the rate of change of the
pebble's momentum?
A- they are equal
B- the boulder's is less than the pebble's
C- the boulder's is greater than the pebble's
D- can't determine - ANSWERSA- they are equal
A 30 kg crate was pulled 40m along a horizontal floor by a constant force Ff=100N, which acts at
a 37* angle to the horizontal direction. The floor exerts a constant friction force Ffr=40N.
Determine the work done on the crate.
A- 800J
B- 1600J
C- 1200J
D- 2400 J - ANSWERSB- 1600J
A 1400 kg car accelerates from the rest to 30 m/s in 7s with a retarding force of 500N. What is
the average power delivered by the engine during this constant acceleration process?
A- 12x10^2W
B- 9.8x10^2W
C- 9.0x10^2W
D- 7.5x10^W - ANSWERSB- 9.8x10^2W
, Which of the following forces is a conservative force?
A- gravitational force
B- electric force
C- elastic force
D- all of the above - ANSWERSD- all of the above
What, approximately, is the percent uncertainty for the measuerment 1.00 m?
A- 0.01%
B - 0.1%
C - 1%
D - 10% - ANSWERSC - 1%
If the acceleration of a car is non-zero (a>0) what is the velocity of the car?
A- 0 m/s
B- -10 m/s
C- 10 m/s
D- All of the above - ANSWERSD- All of the above
Which of the following graphs denote(s) the sum of two vectors, VA=V1+V2
A - not a triangle
B- triangle end to end
C- triangle not end to end
D- obtuse triangle - ANSWERSA- not a triangle
Given that A+B=C and [A] + [B] = [C] denotes magnitude of the vector, how are vectors A and
oriented with respect to each other?
