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Questions in physics

[Homework Help] At a distance x from the centre of the Earth, the weight of an object is \(\frac{W}{4}\) where W is the weight of the object on the surface of the Earth. Which of the following is the expression of radius of the Earth in terms of x? A) \(\frac{x}{4}\) B) \(\frac{x}{2}\) C) \(\frac{3x}{4}\) D) 2x

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

[Homework Help] Which equation is most likely used to determine the acceleration from a $v$ $a=\frac{t}{\Delta v}$ $m=\frac{y_2-y_1}{x_2-x_1}$ $a=\frac{\Delta v}{m}$ $m=\frac{x_2-x_1}{y_2-y_1}$

[Homework Help] What tool would you use to measure the intensity of an audio system in decibels? A. Multimeter B. SPL Meter C. Voltmeter D. Oscilloscope

[Homework Help] Which item has the most thermal energy? A. 1 kg hot water just below the boiling point B. 1 kg ice C. 1 kg boiling water D. 1 kg cold water

[Homework Help] Which explains the information needed to calculate speed and velocity? A. Both require the total distance, but velocity also requires time and displacement. B. Both require time, but velocity requires displacement and speed requires distance. C. Speed requires displacement, while velocity requires distance. D. Speed does not require time, while velocity does require time.

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

[Homework Help] Science 7-Module 11-Wave Reflection Assignment (16 pts) Student Name: Wave Reflection Directions: Now that you have learned about wave reflection, complete the following. Part 1 1. Lay a slinky (from your science kit) on a table and hold both ends. Stretch the slinky across the length of the table and push the slinky towards the right with your left hand. a. What type of wave was created? How do you know? (2pts)

[Homework Help] Which of the following is not a sustainable form of energy production? A. Wind B. Natural Gas C. Water D. Solar

[Homework Help] (BONUS Extra Credit) a. Write the [tex]$\beta+$[/tex] decay equation for [tex]${ }_6^{11} C$[/tex]. b. Calculate the energy released in the decay. The masses of [tex]${ }_6^{11} C$[/tex] is 11.011433 amu and [tex]${ }_5^{11} B$[/tex] 11.009305 amu. ([tex]$1 amu =1.66 \times 10^{-27} kg, E = mc ^2$[/tex] where [tex]$E =$[/tex] energy, [tex]$m =$[/tex] mass, and [tex]$c =$[/tex] speed of light [tex]$=3.0 \times 10^8 m / s$[/tex] )