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Questions in physics

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

[Free] Heat transfer between two substances is affected by specific heat and the A. chemical composition of the substances. B. state of matter of the substances at room temperature. C. thermal equilibrium of the substances. D. amount of time and area of physical contact between the substances.

[Free] Which equation represents a fission reaction? ${ }_7^{14} N+{ }_1^1 H \longrightarrow{ }_8^{15} O$ ${ }_{92}^{235} U +{ }_0^1 n \longrightarrow{ }_{55}^{140} Cs +{ }_{37}^{94} Rb +2_0^1 n$ ${ }_4^9 Be +{ }_2^4 He \longrightarrow{ }_6^{12} C +{ }_0^1 n$ ${ }_{93}^{239} Np \longrightarrow{ }_{94}^{239} Pu +{ }_{-1}^0 e$

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

[Free] [tex]$\beta$[/tex] - decay producing ${ }_{56}^{137} Ba$

[Free] Which equation correctly relates mechanical energy, thermal energy, and total energy when there is friction present in a system? A. [tex]$ME =E_{\text {thermal }}-E_{\text {total }}$[/tex] B. [tex]$ME =E_{\text {total }}-E_{\text {thermal }}$[/tex] C. [tex]$ME =E_{\text {total }}+E_{\text {thermal }}$[/tex] D. [tex]$ME =\frac{E_{\text {total }}}{E_{\text {thermal }}}$[/tex]

[Free] Which symbol and unit of measurement are used for voltage? A. symbol: V; unit: A B. symbol: R; unit Q: C. symbol: V; unit: V D. symbol: R; unit: V

[Free] _______ amplitudes are associated with _______ sounds. Options: 1. higher; louder 2. higher; weaker 3. higher; quieter 4. lower; louder

[Free] A tube with no vacuum would be an example of equipment error. True False

[Free] The table shows the distances between a star and three celestial objects. Use the conversion factors to rewrite the distances in different, but equivalent, units. \begin{tabular}{|l|l|} \hline Celestial Objects & Distance from the Star \\ \hline object A & 0.000001877 pc \\ \hline object B & 30.06 AU \\ \hline object C & 778.3 million km \\ \hline \end{tabular} Conversion factors: $1 AU =1.5 \times 10^8 km$ 1 light-year $=9.5 \times 10^{12} km$ 1 parsec $=31$ trillion km , or about 3.262 light-years