Your cousin’s voice sound different over the telephone than it does in person. This is because telephones

     do not transmit frequencies over about 3000 Hz. Since 3000 Hz is well above the normal frequency of

     speech, why does eliminating these high frequencies change the sound of your cousin’s voice? Carefully

     provide the reasoning behind your answer.

A horizontal pipe of diameter 0.768 m has a smooth constriction to a section of diameter 0.4608 m. The density of oil flowing in the pipe is 821 kg/m3 . If the pressure in the pipe is 7120 N/m2 and in the constricted section is 5340 N/m2 , what is the rate at which oil is flowing? Answer in units of m3/s.

1. When determining the amount of work needed to pump something what would cause the final work to be negative?  

2. What is the purpose behind integration in determining fluid force on vertical surfaces?

Starting from rest, a 4.20-kg block slides 2.30 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is μ_k = 0.436.

(a) Determine the work done by the force of gravity.
J

(b) Determine the work done by the friction force between block and incline.
J

(c) Determine the work done by the normal force.
J

(d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height?

Sarah leaves her house and walks 11 miles to the west and then 6 miles at an angle 30 degrees west of north. How far and in what direction does Sarah need to walk to get home?

A picture and detailed show of work would be appreciated!

Suppose you want to determine the electric field in a certain region of space. You have a small object of known charge and an instrument that measures the magnitude and direction of the force exerted on the object by the electric field.

(a) The object has a charge of +12.0

1- what is the relation between the terminal voltage drop and the resistor voltage drops?

2- how are the absolute potentials related to the voltage drop?

3- how are the resistor voltage drops related to the terminal voltage drop?

4- how are the resistor voltage drops related to the resistances.

5- how are the resistor currents related to the circuit current?

6- How are the resistor currents and resistances related?

7- how are the currents in the wires related to the currents in the resistors ?

8- what can you conclude about Currents in a series circuit? Is the circuit current the same as it was in the parallels circuit?why?

Three capacitors, all initially without any dielectrics inserted, of C1 = 4 micro-farads, C2 = 10 micro-farads, and C3 = 10 micro-farads, are connected purely in series to a battery and the total stored energy of all three capacitors is 248 micro-joules. Then, the plates of C1 are brought closer by a factor of 3 and a dielectric with a dielectric constant of 1.9 is inserted into C2 while still connected in series to the same battery. (C3 does not change at all.) How much does the total stored energy of all three capacitors increase in micro-joules after the capacitors are changed? Not the factor change... how much does the stored energy go up in value. step by step please and thank you!

You have a parallel-plate 6.33 × 10-6 F capacitor that is charged to 0.00861 C. While the capacitor is isolated, you change the plate separation so that the capacitance becomes 2.41 × 10-6 F. How much work do you perform in this process?

A -8.50 nC point charge and a +17.0nC point charge are 17.5 cm apart on the x-axis.

What is the electric potential at the point on the x-axis where the electric field is zero?

What is the magnitude of the electric field at the point on the x-axis, between the charges, where the electric potential is zero?

A playground is on the flat roof of a city school, 6.5 m above the street below (see figure). The vertical wall of the building is h = 7.80 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of θ = 53.0° above the horizontal at a point d = 24.0 m from the base of the building wall. The ball takes 2.20 s to reach a point vertically above the wall. (a) Find the speed at which the ball was launched. (Give your answer to two decimal places to reduce rounding errors in later parts.) m/s (b) Find the vertical distance by which the ball clears the wall. m (c) Find the horizontal distance from the wall to the point on the roof where the ball lands.

Two 10-cm-diameter charged rings face each other, 20.0 cmapart. Both rings are charged to + 10.0 nC . What is the electric field strength

A.)at the midpoint between the two rings?

B.)at the center of the left ring?

How does fluoroscopy work? (to answer this properly you will need to draw a diagram and explain how it works; brief answers won't be acceptable). Be sure to explain in detail how the image intensifier works. Assu

1. Before working this problem, review Conceptual Example 14. A pellet gun is fired straight downward from the edge of a cliff that is 12 m above the ground. The pellet strikes the ground with a speed of 28 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?

_______________________ m

2.  An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of +10 m/s and measures a time of 24.1 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to gravity on this planet? (Indicate direction by the sign of the acceleration.)

_________________ m/s²