General Physics First Exam Second Semester

First Exam GENERAL PHYSICS TIME: 16:00 - 17:00 Student's name: Registration Number: Instructor's Name: Time of Lecture: For all Problems below take g = 9.8 m/s²   Q1) Assume the speed of a nerve impulse in the human body to be constant at 100 m/s. How long (in ms) does it take the nerve impulse to travel from the foot to the brain of a 1.7 meter tall person? (1 ms = 10⁻³ s). a) 100 b) 1.7 c) 17 d) 59 e) 34 Q2) The figure shows the variation of the position x of a car with time t. The average velocity (in m/s) in the time interval t = 0 to t = 6 s is:   graph showing position vs time a) 6 b) -1 c) 0 d) 3 e) -6 Q3) A student accidentally drops a small object from a height of 12 m above the ground. Ignoring air resistance, the speed of the object (in m/s) just before it hits the ground is: a) 0 b) 10.8 c) 12.0 d) 15.3 e) 31.2 Q4) A football player moves 15.0 m north and then 11.0 m south. The distance he has traveled and the magnitude of his displacement, respectively, are: a) 26.0 m, 26.0 m b) 26.0 m, 4.0 m c) 4.0 m, 4.0 m d) 4.0 m, 26.0 m e) 26 m, 0 Q5) The figure shows two vectors A and B. The magnitude of their resultant |R| = |A + B| is: two vectors A and B a) 8.7 b) 13.2 c) 5.7 d) 0 e) 7.0 Q6) A 10-kg rock and 20-kg rock are released from the same height. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground? (Ignore air resistance) a) 2T b) T/4 c) T/2 d) T e) 4T   Overall, this image is a physics exam paper with multiple-choice questions covering topics like: Kinematics: Speed, velocity, acceleration, displacement Dynamics: Forces, gravity, free fall Vectors: Addition and subtraction of vectors Q7) In the figure shown, M = 10.0 kg and m = 4.0 kg. The coefficient of kinetic friction between the inclined surface and mass m is μk = 0.3. Given that mass m moves up the inclined plane, determine the acceleration (in m/s²) of the system. diagram showing a pulley system with two masses connected by a rope a) 6.3 b) 5.6 c) 3.4 d) 9.8 e) 4.9 Q8) In the figure shown, the two blocks are connected by a rope. Mass M = 2kg and all surfaces are smooth. If the force F = 40 N, then the value of the tension T (in Newton) in the rope connecting the masses M and 2M is: diagram showing two masses connected by a rope and pulled by a force a) 6.7 b) 13.3 c) 3.1 d) 11.4 e) 9.8 Q9) In the figure shown, the inclined plane is rough, and μk = 0.4 and μs = 0.1. M = 2 kg, which of the following statements is correct? diagram showing a mass on an inclined plane a) The box accelerates down the incline at 3.4 m/s². b) The box accelerates down the incline at 2.4 m/s². c) The box accelerates down the incline at 1.6 m/s². d) The box moves down the incline at constant velocity. e) The box remains at rest. Q10) In the figure shown, the masses M = 4.0 1 kg and m = 2 kg. The coefficient of static friction between M and the ground is μs = 0.2, and assume that there is NO friction between the mass M and the ground. The maximum allowed value of the force F (in 2 N) such that mass m moves with mass M without sliding is:   1. 2. diagram showing two masses on a horizontal surface, with one mass on top of the other a) 11.76 b) 23.50 c) 9.80 d) 1.23 e) 15.71 INSERT YOUR ANSWERS IN THE FOLLOWING TABLE: Question Answer Q1 C Q2 B Q3 D Q4 B Q5 A Q6 D Q7 E Q8 B Q9 E Q10 A Q1 a = 0 x = vt t = x/v = 1.7/100 = 17 x 10^-3 s = 17 ms Q2 v = Δx/Δt = (x(6) - x(0))/(6 - 0) = 0 - 6 / 6 - 0 = -1 m/s Q3 v_f^2 - v_i^2 = 2gΔy v_f^2 - 0 = 2(9.8)(12) v_f = 15.3 m/s Q4 Displacement = d = 15 - 11 = 4 m Distance = 15 + 11 = 26 m Q5 R_x = A_x + B_x = 10 - 3 = 7 m R_y = A_y + B_y = 0 + 3√3 = 3√3 m |R| = √(R_x^2 + R_y^2) = 8.7 m Q6 Both blocks started from rest and from the same height. Since air resistance is ignored, they have the same acceleration (gravitational acceleration). Therefore, they reach the ground at the same time.