Physics Class 10 Exam Guidelines and Problems
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Questions and Answers

What is the main purpose of the honor pledge in this examination?

  • To encourage collaboration among students during the exam.
  • To facilitate communication with the instructor during the exam.
  • To allow students to use resources during the examination.
  • To confirm that the student has adhered to academic integrity. (correct)

    • Which action is prohibited during the exam according to the guidelines?

  • Using a scientific calculator.
  • Printing and signing your name.
  • Using any Internet-connected device. (correct)
  • Raising your hand for clarification.

    • What is required of students in terms of showing their work on problems?

  • Solutions can be submitted on scratch paper without any labels.
  • Results should be expressed with numerical calculations only.
  • Algebraic reasoning should be shown before numerical calculations. (correct)
  • Only correct answers need to be provided without explanations.

    • What should a student do if they cannot complete one part of a problem?

    <p>Move on to the next part of the problem.</p> Signup and view all the answers

    In the equation Hr = 1990m^-0.25, what does Hr represent?

    <p>The heart rate of the bird.</p> Signup and view all the answers

    What is the significance of labeling the numerical value of the slope on the graph of a klipspringer's jump?

    <p>It represents the relationship between time and height.</p> Signup and view all the answers

    When calculating the time at which a klipspringer reaches maximum height, what other information must be included on the graph?

    <p>The initial value of the y-velocity.</p> Signup and view all the answers

    What must be calculated to determine the total horizontal distance a squirrel travels during its jump?

    <p>The horizontal velocity and time of flight.</p> Signup and view all the answers

    If a squirrel jumps with a horizontal velocity of 3.0 m/s and lands 2.0 m away, what is necessary to find its total displacement?

    <p>The time taken and the vertical distance fallen.</p> Signup and view all the answers

    What unit is appropriate for expressing acceleration in the context of the squirrel's jump?

    <p>m/s²</p> Signup and view all the answers

    What type of graph would show a straight line for a given relationship if it follows a power relationship?

    <p>Log-log graph</p> Signup and view all the answers

    If box A is twice the volume of box B, how much more wrapping paper is needed for box A given that surface area scales differently than volume?

    <p>100% more wrapping paper</p> Signup and view all the answers

    In the context of average acceleration, if Sprinter A's velocity increases while Sprinter B's remains constant, what can be said about their accelerations?

    <p>Sprinter A has positive acceleration, and Sprinter B has zero acceleration.</p> Signup and view all the answers

    What is the effect of pulling a box at constant speed on the forces acting on the box?

    <p>The pulling force equals the frictional force.</p> Signup and view all the answers

    When representing velocity versus time for sprinters A and B, what aspect must be accurately conveyed in the graph?

    <p>Relative magnitudes and directions of velocities need to be clear.</p> Signup and view all the answers

    In a free-body diagram for a box being pulled on a surface, which of the following forces must be present?

    <p>Normal force, weight, and friction force.</p> Signup and view all the answers

    Why is it important to qualitatively represent the magnitude of forces with arrow lengths in a free-body diagram?

    <p>It helps in understanding the relationship between different forces.</p> Signup and view all the answers

    What does the coefficient of kinetic friction being less than 1 indicate for a box sliding on the floor?

    <p>Friction is present but is weaker than the pulling force.</p> Signup and view all the answers

    What does the acceleration vs. time graph look like for an object that is moving in one dimension and slowing down?

    <p>It should be a line that approaches the time axis from above.</p> Signup and view all the answers

    When sketching a position vs. time graph for an object that is slowing down, how does the curve behave?

    <p>It is a concave down curve that becomes less steep over time.</p> Signup and view all the answers

    What would be the mathematical form of the relationship between femoral trabecular bone number (Tb,N) and femur head height (FHH) as noted in the study?

    <p>Tb,N = k * FHH, where k is a constant.</p> Signup and view all the answers

    In the relationship BS/BV ∝ FHH−0.62, what does the exponent -0.62 signify?

    <p>That BS/BV decreases as FHH increases.</p> Signup and view all the answers

    What is the vertical component of the klipspringer’s velocity at the peak of its jump?

    <p>0 m/s.</p> Signup and view all the answers

    If the klipspringer leaves the ground with a speed of 12.0 m/s at 40° above the ground, what is the horizontal component of its velocity?

    <p>12.0 m/s cos(40°).</p> Signup and view all the answers

    Which graph accurately represents the x-component of the klipspringer’s velocity over time?

    <p>It remains constant over time.</p> Signup and view all the answers

    What does the equation $W + Q = DE = DK + DU + DEth$ represent?

    <p>The principle of conservation of energy</p> Signup and view all the answers

    On a velocity vs. time graph for an object slowing down, what characterizes the velocity?

    <p>The velocity shows a negative slope.</p> Signup and view all the answers

    Which formula correctly calculates the area of a circle?

    <p>Acircle = $ heta r^2$</p> Signup and view all the answers

    What does the variable $v_{rms}$ represent in the context of motion?

    <p>Root mean square velocity of particles</p> Signup and view all the answers

    Which of the following equations represents the kinetic energy of an object?

    <p>$K = rac{1}{2} mv^2$</p> Signup and view all the answers

    In the equation $F = ma$, what does 'm' stand for?

    <p>Mass of the object</p> Signup and view all the answers

    How is the stress in a material defined in mechanical terms?

    <p>Stress is defined as force per unit area.</p> Signup and view all the answers

    Which equation represents conservation of mass for an ideal gas?

    <p>$ ho = rac{m}{V}$</p> Signup and view all the answers

    Which formula gives the expression for potential energy in a gravitational field?

    <p>$Ug = mgh$</p> Signup and view all the answers

    What does the term resilience refer to when discussing materials?

    <p>The energy absorbed during elastic deformation</p> Signup and view all the answers

    What does the variable $n$ represent in the equation $n = rac{N}{N_A}$?

    <p>Number of moles of a substance</p> Signup and view all the answers

    Study Notes

    Examination Guidelines

    • 50 minutes allotted for completion; no electronic devices permitted.
    • Write name and PID on each exam page.
    • Closed book; all equations and constants provided on the exam.
    • Use a calculator for calculations; no internet-connected devices allowed.
    • Work must be shown algebraically with clear variable notation for grading.
    • Answers should include units and follow significant figure rules.

    Heart Rate and Mass Relationship

    • Equation: Hr = 1990m^-0.25.
    • Log-log graph representation indicates a linear relationship between heart rate and mass.

    Box Wrapping Paper Problem

    • Box A has twice the volume of Box B.
    • Calculate the difference in wrapping paper needed for Box A.

    Sprinter Average Acceleration

    • Draw arrows to represent average acceleration for both sprinters.
    • Explanation should relate to changes in velocity over time intervals.

    Free-Body Diagram of a Box

    • A box pulled at constant speed experiences friction.
    • Forces to label: normal, friction, weight, with appropriate subscripts.

    Motion Graphing for a Slowing Object

    • Sketch both position vs. time and velocity vs. time graphs.
    • Graphs must clearly indicate characteristics of an object slowing down.

    Relationships in Bone Studies

    • Graph indicates a connection between trabecular bone number (Tb,N) and femur head height (FHH).
    • Requires derivation of the equation for Tb,N in terms of FHH without using logarithms.

    Jump Physics of Klipspringers

    • Initial velocity of 12.0 m/s at a 40° angle.
    • Graphs of velocity components must include slope, initial velocities, and key timing points (max height and landing).
    • Calculate the maximum height and total horizontal distance covered during the jump.

    Squirrel Jump Analysis

    • Horizontal velocity of 3.0 m/s over a distance of 2.0 m.
    • Determine the components of acceleration (x and y) during the jump.
    • Calculate the final velocity and total displacement upon landing.

    Key Constants and Formulas

    • Gravitational acceleration (g): 9.8 m/s².
    • Relevant formulas include:
      • Work-Energy principles (W + Q = ΔE = ΔK + ΔU + ΔEth).
      • Motion equations relating distance, time, velocity, and acceleration.
      • Area and volume formulas for geometric shapes (circle, sphere, cylinder).

    Additional Concepts

    • Understanding of stress, strain, and their relationships.
    • Application of thermodynamic principles (ideal gas law, statistical mechanics).
    • Concepts of resilience and average kinetic energy in ideal gases.

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    Quiz Team

    Description

    This quiz covers examination guidelines and various physics problems related to heart rate and mass, volume calculations, average acceleration, and free-body diagrams. Ensure to follow the provided equations and guidelines for accurate answers.

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