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Questions in physics

📝 Answered - A 10-ohm resistor and a 15-ohm resistor are connected in parallel. What is the total resistance of these two resistors? Select one: a. $2 \Omega$ b. $4 \Omega$ c. $6 \Omega$ d. $8 \Omega

📝 Answered - Select the correct answer. Venus is an average distance of 108.2 million kilometers from the Sun. Use the conversion factor [tex]$1 AU =1.5 \times 10^8 km$[/tex] to convert this distance from kilometers to astronomical units. Choose the closest answer. A. [tex]$0.72 AU$[/tex] B. 1.25 AU C. 3.56 AU D. 45.63 AU E. 96.12 AU

📝 Answered - What label should Patty place in the marked cell? A. Battery B. Switch C. Resistor D. Bulb

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

📝 Answered - Which accurately completes the statement? Conduction involves the transfer of electric charge or A. thermal energy B. light waves C. protons D. neutrons due to the movement of particles.

📝 Answered - $\beta+$ decay of ${ }^{22} Na$

📝 Answered - Which equation could be rearranged to calculate the frequency of a wave? A. wavelength = frequency/speed B. frequency = wavelength/speed C. wavelength = speed/frequency D. frequency = speed $\times$ wavelength

📝 Answered - The final velocity of an object moving in one dimension is given by the formula [tex]$v=u+a t$[/tex], where [tex]$u$[/tex] is the initial velocity, [tex]$a$[/tex] is the acceleration, and [tex]$t$[/tex] is the time. Solve this equation for [tex]$t$[/tex]. To solve for [tex]$t$[/tex], first subtract [tex]$u$[/tex] from both sides of the equation. Subtracting [tex]$u$[/tex] from both sides of the equation results in: [tex]$v-u=a t$[/tex] Solve this equation for [tex]$t$[/tex]. A. [tex]$t=(v-u)-a$[/tex] B. [tex]$t=(v-u)+a$[/tex] C. [tex]$t=a(v-u)$[/tex] D. [tex]$t=(v-u) / a$[/tex]

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

📝 Answered - 3. How does lubrication reduce friction? An object is moving from north to south. What is the direction of the force of friction on the object? Give an example to show the effect of heat generated in a machine due to excessive friction.