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Questions in physics

[Free] Which best defines the relationship between speed and velocity? A. Speed is velocity with displacement. B. Velocity is speed with displacement. C. Speed is based on a specific direction. D. Velocity is based on distance.

[Free] What is the electrical force between [tex]$q_1$[/tex] and [tex]$q_2$[/tex]? Recall that [tex]$k =8.99 \times 10^9 N \cdot \frac{ m ^2}{ c ^2}$[/tex]. [tex]$q_1=+6 C$[/tex] [tex]$q_2=-4 C \quad q_3=+3 C$[/tex]

[Free] How does the mass of an object affect its speed? Independent Variable: Dependent Variable: Constant: * Surface the object is moving on * Object's speed * Mass of object

[Free] Blake is doing an experiment to find the relationship between string tension [tex]F_T[/tex], string linear density [tex]D[/tex], frequency of oscillation ([tex]f[/tex]) and wavelength ([tex]\lambda[/tex]) for a wave on a string. The student keeps the string tension and density constant. He sets the frequency of the string's oscillation and measures the wavelength. The known relationship is: [tex]\sqrt{\frac{F_T}{D}}=f \lambda[/tex] Rearrange the equation so the dependent variable is by itself on one side. What variables could he graph to get a linear relationship? x : y : Fill in the data table below with any additional data you need to linearize it.

[Free] What is the electrical force between [tex]$q_2$[/tex] and [tex]$q_3$[/tex]? Recall that [tex]$k=8.99 \times 10^9 N \cdot \frac{m^2}{c^2}$[/tex].

[Free] Calculate $\frac{(6.34 cm)(1.2 cm)}{\left(1.217 cm^2\right)}$. Round off if necessary to apply the rule of significant figures for multiplication and division of data.

[Free] Formulas: [tex]S=d / t \quad S t=d \quad t=d / S[/tex] 1. A car travels 300 km in 6 hours. What is the average speed of the car (in [tex]km / hr[/tex])?

[Free] Large radioactive atoms decay into smaller atoms by releasing alpha particles. Each alpha particle has 2 protons, 2 neutrons, and 0 electrons. The table below describes several neutral, low-mass atoms. \begin{tabular}{|l|l|l|l|} \hline \multicolumn{4}{|c|}{ Stable Isotopes of Low-Mass Elements } \\ \hline Element Name & Symbol & \begin{tabular}{l} Atomic \\ Number \end{tabular} & \begin{tabular}{l} Number of \\ Neutrons \end{tabular} \\ \hline Hydrogen & H & 1 & 0 \\ \hline Helium & He & 2 & 2 \\ \hline Lithium & Li & 3 & 4 \\ \hline Berylium & Be & 4 & 5 \\ \hline \end{tabular} An alpha particle is also referred to as a nucleus of which isotope? A. lithium-7 B. helium-4

[Free] The table shows data for a car stopping on a wet road. \begin{tabular}{|c|c|} \hline$v$ & $d$ \\ \hline 20 & 38 \\ \hline 30 & 86 \\ \hline 40 & 153 \\ \hline \end{tabular} Stopping distance formula [tex]d(v)=\frac{2.15 v^2}{64.4 f}[/tex] To determine the value of [tex]f[/tex], substitute a pair of values for [tex]d[/tex] and [tex]v[/tex] into the equation and solve. Round to the nearest hundredth.

[Free] Until a train is a safe distance from the station, it must travel at [tex]$5 m / s$[/tex]. Once the train is on open track, it can speed up to [tex]$45 m / s$[/tex]. If it takes a train 8 seconds to reach [tex]$45 m / s$[/tex], what is the acceleration of the train? (Round your answer to the nearest whole number.)