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Questions in physics

[Answered] 1. During a training session, an athlete runs 140 m West along a straight road (A to B). He then runs 100 m East (B to C) and then finally 60 m East (C to D). The total time taken for this session is 2.5 seconds. 1.1 Draw a vector diagram to represent the three displacements (A to B, B to C, and C to D). 1.2 On the vector diagram, draw and indicate the resultant displacement. 1.3 Calculate the total distance covered by the athlete. 1.4 Determine the change in position at D, relative to A. 1.5 Calculate the average velocity of the athlete.

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] A cyclist covers his first three km at the speed of 8 km per hour, another two km at 3 km per hour, and the last two km at the speed of 2 km per hour. What is the average speed of that cyclist, commenting on the choice of your average?

[Answered] State and describe briefly at least one measuring instrument for each of the following physical quantities: a) Mass b) Illumination c) Density d) Irradiance e) Temperature f) Pressure g) Flowrate

[Answered] Write about the third class lever system, include examples, and explain in detail why they are third class lever systems.

[Answered] Given: S = 100 m t = 5 s U = 0 Using the equation of motion: s = ut + \frac{1}{2}at^2 Substitute the values: 100 = 0 \times 5 + \frac{1}{2} \times a \times (5)^2 Simplify: 100 = \frac{1}{2} \times a \times 25 Find acceleration (a).

[Answered] According to the work-energy theorem, the amount of work done can be determined using which formula? A. [tex]$W=\Delta K E=2 m\left(v_i^2-v_f^2\right)$[/tex] B. [tex]$W=\Delta K E=\frac{1}{2} m\left(v_i^2-v_f^2\right)$[/tex] C. [tex]$W=\Delta K E=2 m\left(v_f^2-v_i^2\right)$[/tex] D. [tex]$W=\Delta K E=\frac{1}{2} m\left(v_f^2-v_i^2\right)$[/tex]

[Answered] A force acts in the direction $(4,2)$, moving an object along a straight path from $(2,-4)$ to $(10,1)$. How much work is done by the force? A. 12 joules B. 42 joules C. 48 joules D. 78 joules

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] The acceleration of an object due to gravity is 32 feet per second squared. What is acceleration due to gravity in inches per second squared? A. [tex]$\frac{3}{8}$[/tex] inches per second squared B. [tex]$2 \frac{2}{3}$[/tex] inches per second squared C. 384 inches per second squared D. 1,024 inches per second squared