5. A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 2.0 kg. Its volume is 5.0 m². The density of air is 1.3 kg/m³. Which of the following statements is true? (a) The balloon will fall because its density is less than that of air. (b) The balloon will remain stationary because its density is less than that of air. (e) The balloon will fall because the upward buoyant force is less than its weight. (d) The balloon will rise because the upward buoyant force is greater than its w (e) The balloon will fall because the donward buoyant force is greater than the u buoyant force. OC

P Performance Matters Welcome, Bertiana! ► || A Tools - Question 2 of 51 Submit Test 04.CFE.2003380.2003390.2003836.2003840.Phy... A cell phone will typically have a power output of 1.4 watts when playing a song that lasts for 300 seconds. If the electrical resistance of the cellphone is 400 Q, what is the total charge needed to play the song?

Q2

Q1) Ohm's Law (in electricity) states that the current (I) is proportional to the applied voltage (V). The constant of proportionality is the resistance (R). The resulting equation is: V = IR. This equation is re-arranged to: I = (1/R) V. Since this is a linear equation, the plot between V (on the x-axis) and I (on the y-axis) should be a straight line, with the slope being 1/R. In an experiment, the following data has been obtained for current for different values of the voltage. Voltage 1 2 3 Current 0.8 2.5 2.9 4.2 5.6 a) Determine the equation for the best-fit line from this data, by using the method of least squares. Equation: Plot the data points, and the straight line representing the equation that you found in part b) 'a'. (Note: the best-fit line will not pass through all the data points) c) Use the slope of the line to find the resistance. Resistance: LO