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V2 How to make 200 ml of a solution that is 100 mM KCL, 10 % sarkosyl, and 0.2 M Tris -HCI? (MW KCl = 74.5, MW Tris=121, MW Sarkosyl =293). (Valeh How to make 500 ml of a solution that is 0.01 M NaCl, 5x v/v SSC and 200 mM NaOH? ( MW NaCl = 58.44, MW NaOH = 40, and 20 X SSC) 21

Chemistry, Science / By Christabel Ireri

EXPERT ANSWER

a)What is the minimum initial velocity of the ball in the pictured thread pendulum in point 1 so that it just creates a circular path? circular path? (Ball not present in 2!)b)in another experiment ,the ball in point a gets released out of rest , the ball hits in point 2 elastically a 2nd ball of a thread pendulum that is 1.2m long. The second ball is at rest before the impact and has half the mass of ball 1. What heights h1 and h2 do the balls reach after the collision?

a)What is the minimum initial velocity of the ball in the pictured thread pendulum in point 1 so that it just creates a circular path? circular path? (Ball not present in 2!)b)in another experiment ,the ball in point a gets released out of rest , the ball hits in point 2 elastically a 2nd ball of a thread pendulum that is 1.2m long. The second ball is at rest before the impact and has half the mass of ball 1. What heights h1 and h2 do the balls reach after the collision? Read More »

1.In the lab, how did you determine (experimentally) what the value of the time constant for any individual RC circuit?

Physics, Science / By Christabel Ireri

1.In the lab, how did you determine (experimentally) what the value of the time constant for any individual RC circuit? PHY 202: RC Circuit Equipment 1 Resistor/Capacitor/Inductor Network 1 Voltage Sensor 1 Short Patch Cord Set 1 850 Universal Interface 1 PASCO Capstone Introduction The manner by which the voltage on a capacitor decreases is …

1.In the lab, how did you determine (experimentally) what the value of the time constant for any individual RC circuit? Read More »

When a particular inductor is connected to a source of sinusoidally varying emf with constant amplitude and a frequency of 59.5 Hz, the rms current is 1.70 A. (i)What is the rms current if the source frequency is doubled? 6.8 A 3.40 A 2.40 A 1.70 A 0.85 A (ii)Repeat part (i) assuming the load is a capacitor instead of an inductor. 6.8 A 3.40 A 2.40 A 1.70 A 0.85 A (iii)Repeat part (i) assuming the load is a resistor instead of an inductor. 6.8 A 3.40 A 2.40 A 1.70 A 0.85 A

Physics, Science / By Christabel Ireri

EXPERT ANSWER

Consider the following figure (a) What is the time average of the “square-wave” potential shown in the figure above? 2AVmax @ Δ ‘max/2 @ Δ ‘max/4 (b) What is the rms voltage? 2AVmax @ Δ ‘max @ Δ ‘max/2

Physics, Science / By Christabel Ireri

EXPERT ANSWER

If the voltage across a circuit element has its maximum value when the current in the circuit is zero, which of the following statements must be true? (Select all that apply.) -The current and voltage are 90

Physics, Science / By Christabel Ireri

If the voltage across a circuit element has its maximum value when the current in the circuit is zero, which of the following statements must be true? (Select all that apply.) -The current and voltage are 90 EXPERT ANSWER The current and voltage are 90 degrees out of phase.

A series RLC circuit contains a 24.0-O resistor, a 0.720-µF capacitor, and a 130-mH inductor. (i) If a sinusoidally varying rms voltage of 120 V at f = 490 Hz is applied across this combination of elements, what is the rms current in the circuit?(ii) What is the rms current in the circuit when operating at its resonance frequency?

Physics, Science / By Christabel Ireri

A series RLC circuit contains a 24.0-O resistor, a 0.720-µF capacitor, and a 130-mH inductor.(i) If a sinusoidally varying rms voltage of 120 V at f = 490 Hz is applied across this combination of elements, what is the rms current in the circuit?a.2.13 Ab.5.00 Ac.12.0 Ad.19.0 A (ii) What is the rms current in …

A series RLC circuit contains a 24.0-O resistor, a 0.720-µF capacitor, and a 130-mH inductor. (i) If a sinusoidally varying rms voltage of 120 V at f = 490 Hz is applied across this combination of elements, what is the rms current in the circuit?(ii) What is the rms current in the circuit when operating at its resonance frequency? Read More »

When a particular inductor is connected to a source of sinusoidally varying emf with constant amplitude and a frequency of 60.0 Hz, the rms current is 3.00 A. What is the rms current if the source frequency is doubled? (a) 12.0 A (b) 6.00 A (c) 4.24 A (d) 3.00 A (e) 1.50 A (ii) Repeat part (i) assuming the load is a capacitor instead of an inductor. (iii) Repeat part (i) assuming the load is a resistor instead of an inductor.

Physics, Science / By Christabel Ireri

When a particular inductor is connected to a source of sinusoidally varying emf with constant amplitude and a frequency of 60.0 Hz, the rms current is 3.00 A. What is the rms current if the source frequency is doubled? (a) 12.0 A (b) 6.00 A (c) 4.24 A (d) 3.00 A (e) 1.50 A (ii) Repeat part (i) assuming the load is a capacitor instead of an inductor. (iii) Repeat part (i) assuming the load is a resistor instead of an inductor. Read More »

An inductor and a resistor are connected in series across an AC source as in the figure below. Immediately after the switch is closed, which of the following statements is true? (Select all that apply.)

Science, Physics / By Christabel Ireri

An inductor and a resistor are connected in series across an AC source as in the figure below. Immediately after the switch is closed, which of the following statements is true? (Select all that apply.) EXPERT ANSWER The presence of the inductor impedes the increase of a current in the RL circuit when an AC power source …

An 7.90 mu F capacitor is connected to the terminals of a 60.0 Hz AC source whose rms voltage is 155 V. Find the capacitive reactance and the rms current in the circuit. Conceptualize The figure shows the physical situation for this problem. Categorize We evaluate the reactance and the current from equations developed in this section, so we categorize this example as a substitution problem. Use the following equation to find the capacitive reactance: Xc = 1/omega C =1/2 pi fC Xc = 1/2 pi (60 Hz)(7.9 Times 10-6 F) Xc = Ohm Use an rms version of the maximum current in a capacitor to find the rms current: Irms = Delta Vrms/Xc = 155V/366 Ohm Irms What if we change the frequency, and the rms current is measured to be 0.60 A? Find the new frequency. f = Hz Follow the example closely. What is the capacitive reactance? Your response differs from the correct answer by more than 100%.

Physics, Science / By Christabel Ireri

EXPERT ANSWER Here , for Vrms = 155 V for Irms = 0.6 A using ohm’s law reactance of capactior , Xc = 155/.6 Xc = 258.3 Ohm 1/(2*pi*f*C) = Xc 1/(2*pi*f*7.9 *10^-6) = 258.3 f = 78.1 Hz the frequency is 78.1 Hz

V2 How to make 200 ml of a solution that is 100 mM KCL, 10 % sarkosyl, and 0.2 M Tris -HCI? (MW KCl = 74.5, MW Tris=121, MW Sarkosyl =293). (Valeh How to make 500 ml of a solution that is 0.01 M NaCl, 5x v/v SSC and 200 mM NaOH? ( MW NaCl = 58.44, MW NaOH = 40, and 20 X SSC) 21

1.In the lab, how did you determine (experimentally) what the value of the time constant for any individual RC circuit?

Consider the following figure (a) What is the time average of the “square-wave” potential shown in the figure above? 2AVmax @ Δ ‘max/2 @ Δ ‘max/4 (b) What is the rms voltage? 2AVmax @ Δ ‘max @ Δ ‘max/2

If the voltage across a circuit element has its maximum value when the current in the circuit is zero, which of the following statements must be true? (Select all that apply.) -The current and voltage are 90

An inductor and a resistor are connected in series across an AC source as in the figure below. Immediately after the switch is closed, which of the following statements is true? (Select all that apply.)

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