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Questions in physics

📝 Answered - Which of the following best differentiates between long wavelengths and short wavelengths? A. Long wavelengths have low frequency; short wavelengths have high frequency. B. Short wavelengths have low frequency; long wavelengths have high frequency. C. Long wavelengths are visible: short wavelengths are not. D. Short wavelengths are visible; long wavelengths are not.

📝 Answered - Polly is pushing a box to the right across the floor with a force of 30 N. The force of gravity is 8 N, and the normal force is 8 N. Which value could describe the force of friction if Polly could not move the box? $\leftarrow 30 N$ $\leftarrow 8 N$ $\rightarrow 8 N$ $\rightarrow 30 N$

📝 Answered - (c) Two uniform line charges $L_1$ and $L_2$ of density $8.854 nC/m$ each located in space along the plane $Z = 0$ at $y = +6$ and $y = -6$ m respectively. At point $P (0,0,6)$, determine the: (i) electric field strength due to line 1 ; (ii) electric field strength due to line 2 ; (iii) total field strength.

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

📝 Answered - Machines A, B, and C do the same amount of work, but they each take a different amount of time. Machine A takes more time as compared to machine C. Machine B takes the maximum time to do the same amount of work. Which machine expends the most power doing this work? A. machine A B. machine B C. machine C D. machines A and B

📝 Answered - Which statement accurately describes temperature? A. Temperature is the kinetic energy of the molecules in a substance. B. Temperature is a measure of the average kinetic energy of the molecules in a substance. C. Temperature is the amount of heat in a substance. D. Temperature is a measure of the potential energy of a substance.

📝 Answered - A negative test charge experiences a force to the right as a result of an electric field. Which is the best conclusion to draw based on this description? A. The electric field points to the left because the force on a negative charge is opposite to the direction of the field. B. The electric field points to the right because the force on a negative charge is in the same direction as the field. C. No conclusion can be drawn because the sign of the charge creating the field is unknown. D. No conclusion can be drawn because the amount of charge on the test charge is unknown.

📝 Answered - What type of particles move to create electricity? A. electrons B. protons C. neutrons

📝 Answered - Kyle has a mass of 54 kg and is jogging at a velocity of [tex]$3 m / s$[/tex]. What is Kyle's kinetic energy? (Formula: [tex]$K E=\frac{1}{2} m v^2$[/tex])

📝 Answered - The amount of potential energy, [tex]$P$[/tex], an object has is equal to the product of its mass, [tex]$m$[/tex], its height off the ground, [tex]$h$[/tex], and the gravitational constant, [tex]$g$[/tex]. This can be modeled by the equation [tex]$P=m g h$[/tex]. What is the equivalent equation solved for [tex]$h$[/tex]? A. [tex]$\frac{\left(\frac{p}{m}\right)}{g}=h$[/tex] B. [tex]$\frac{P}{m g}=h$[/tex] C. [tex]$P m g=h$[/tex] D. [tex]$\frac{P}{\left(\frac{m}{g}\right)}=h$[/tex]