General Physics First Exam First Semester

PHYSICS (First Student’s Name First Semester (Nov. 3rd ) Exam) …………………………… Lecturer’s Name:…................................................... Registration #………………….. Section # ..................................... CONSIDER (ACCELERATION DUE TO GRAVITY) g = 9.8 m/s2 Q1) An object moving with a constant acceleration has a velocity of 20 cm/s when its position x = 10 cm. Its position 4.0 seconds later is x = 30 cm. What is the acceleration of the object (in cm/s2)? A) -8.9 B) -5.1 C) 9.8 D) 4.4 E) -6.3 Q2) A stone falls from a cliff 80 m high. The magnitude of the average velocity during the first 4 seconds of its fall (in m/s) is: A) 3.5 B) 9.1 C) 14.7 D) 19.6 E) 21.3 Q3) A child throws a ball from the top of building downward with a speed of 5.0 m/s. It strikes the ground with a speed of 34 m/s. The height of the building (in m) is: A) 58 B) 42 C) 29 D) 17 E) 63 Q4) A man starts from the origin and walks 15 m along the positive x – axis. He then moves along the negative x – axis back to the origin. If the time of the whole trip is 5 s, then his average speed (in m/s) is A) 0 B) 4 C) 2 D) 5 E) 6 y Q5) Vectors A and B are represented as shown in the figure. What is the angle of their resultant with respect to the positive x-axis? A) 25 B) 103 D) 55 E) 112 C) 77 B=4 150 x A=3 Q6) A block of mass M = 6.0 kg is in contact with another block of mass m = 4.0 kg on a frictionless surface, as shown in the Figure. The force 𝐹 = 30 N is applied as shown in the figure. What is the magnitude of the force of the M block on the m block? F A) 12.0 N D) 10.0 N B) 6.0 N E) 4.0 N C) 8.0 N M m Q7) A 2.0 – kg mass is given an initial speed of 5 m/s along a rough horizontal floor. If the coefficient of kinetic friction 𝜇𝑘 = 0.20, then the distance (in m) covered before the mass stops is: A) 6.4 B) 1.3 C) 12.8 D) 9.2 E) 1.8 Q8) In the figure the coefficient of kinetic friction between the mass m1 and the horizontal surface is 𝜇𝑘 = 0.10 and m1 = 4.0 kg, m2 = 2.0 kg. The acceleration of the system (in m/s2) is: m1 A) 2.45 B) 3.92 C) 1.30 D) 2.61 E) 10.25 m2 Q9) In the figure shown, the coefficient of static friction between the mass M and the vertical wall is 𝜇𝑠 = 0.20 . Given that M = 3.0 kg, determine the minimum value of the horizontal force F required to keep the mass M stationary. A) 0 D) 74 B) 20 E) 147 C) 30 M F Q10) In the Figure, a constant external force P = 160 N is applied to a 20-kg box, which is on a rough horizontal surface. The force pushes the box a distance of 8.0 m, in a time interval of 4.0 s, and the speed changes from vi= 0.5 m/s to vf = 2.6 m/s. The work done by friction is equal to: A) +1109 J D) +1076 J B) -1043 J E) -1076 J C) 1043 J List your final answers in this table. Only the answer in this table will be graded Question Answer Q1 A Q2 D Q3 A Q4 E Q5 B Q6 A Q7 A Q8 D Q9 E Q10 B