25. If the following waves are superposed y1 = A Cos[k x – w t] and y2 = A Cos[k x + w t] where A = 0.2 cm, f = 10 Hz and c = 10 m/s. (a) Sketch the waveform at time t = 0 and t = 1/40 s. (b) What is the distance between the nodes. (c) Determine the kinetic and potential energy contained within the string section between the a node and an antinode. (d) Show that the total energy between the node and antinode is a constant in time. Why is this physically reasonable?

1) A 1000 kg rocket travels in outer space at 5000 m/s. The rocket then separates into two sections: a 250 kg section that travels at 8000 m/s, and a 750 kg section. All of this takes place in a straight line that you can consider as your x-axis. (Do not assume kinetic energy is constant throughout this process.)

A) What is the total momentum of the system before the separation?

B) What is the total kinetic energy of the system before the separation?

C) What is the final velocity of the more massive 750 kg rocket section?

D) What is change in the system’s kinetic energy in Joules?

please please help me

Determine if the following requirements for a wet well control system, are consistent:

a) If the pump is on then the valve shall be open.

b) If the valve is closed then the water level is ≤ 10 meters.

c) If the water level is >10 meters then the pump is on.

If the current in the solenoid is ramped at a constant rate from zero to I_s= 2.10 A over a time interval of 75.0 ms, what is the magnitude of the emf in the outer coil while the current in the solenoid is changing?

What is the mutual inductance between the solenoid and the short coil?

Now reverse the situation. If the current in the short coil is ramped up steadily from zero to I_c= 2.80 A over a time interval of 11.0 ms, what is the magnitude of the emf in the solenoid while the current in the coil is changing?

*define convection

*list three examples in the world around you where convection currents are important. Give a short description of each.

Water heater

In a water heater, tap water with the temperature 10 degrees celcius is heated to 60 degrees celcius. For a shower, a total of 20 litres of water is used. Water from the water heater is mixed with tap water to reach the temperature 35 degrees celcius when one showers.

1. How much ENERGY is needed to heat 10 litres of water from 10 celcius to 60 celcius?

2. How much EXERGY is needed to heat 10 litres of water from 10 celcius to 60 celcius?

3. How much ENERGY is needed to heat 20 litres of water from 10 celcius to 35 celcius?

4. How much EXERGY is needed to heat 20 litres of water from 10 celcius to 35 celcius?

5. What is the change in entropy when 10 litres of water with the temperature 10 celcius is mixed with 10 litres of water with the temperature 60 celcius?

what is eddy current.explain minimum in 100 words.

All of the following is an example of random error except

Group of answer choices

Poor thermal contact between thermometer and object being measured.

Vibrations in air current when measuring mass

Inconsistent environmental temparature

Irregularities in the object being measured

When all measurements of a quantity are consistently bigger or consistently smaller than the true value, these best indicates ________________________

Group of answer choices

Systematic error in measurements

Normal variation

All of the above

Random error in measurements

A t score value of zero implies

Group of answer choices

The measured and actual value are the same (a perfect result)

The discrepancy is one standard deviation

The measured value is largely deviated from the actual value and unacceptable

No correlation between measured value and actual value

For a picket fence in free-fall, the measured time between every displacement (△ x) will __________. (Hint: Velocity gradually increases from initial velocity value)

Group of answer choices

Remain constant

Decrease

Increase

Oscillate

Michael Jordan is riding the Giant Drop at Great America. If Michael Jordan falls for 2600 milliseconds, what will be his final velocity and how far will he fall?

Type in your correct answers and have the correct units by them for full points

Use g = 9.8 m s − 2

You are working with a team designing capacitors for specialized purposes. One client needs a capacitor shaped like a sphere that can store the most energy for its size. You are to begin the design process by performing calculations for a simple spherical capacitor consisting of two thin concentric spherical shells separated by a dielectric. You decide to calculate the maximum energy that can be stored in terms of the radius of the outer shell and the maximum electric field that the dielectric can withstand before breaking down.

After you have derived a symbolic answer, get an idea of how much energy this is by finding a numerical answer for a capacitor with an outer shell that has a radius of 5 cm (about the size of a softball), filled with a dielectric with a breakdown voltage of 150 x 10⁶ V/m and a dielectric constant of 3.

(a)  Give a purely symbolic answer to the problem in terms of (only) the quantities given in the problem and known constants. Be sure to define each of the symbols you use.

(b) Give a numerical answer to the problem.

Enter the data from the table below into Microsoft Excel and determine the linear correlation coefficient, R2 for time versus position.
Then, calculate y/t and determine the linear correlation coefficient, R2 for time versus y/t. Write in the calculated values in the table below (use two decimal places).

1. Determine the linear correlation coefficients, R2, for both the y vs. t data and the y/t vs. t data. (Both to four decimal places.)

   For y vs. t, R2 = ____________ For y/t vs. t, R2 = ____________

2. Using the linearized relationship, y/t vs. t, report the properly rounded best estimate for ?. (?"## = 980.35 ??/?0.)

g =

%diff=

Part b.
A thin hoop of mass 22 kg and radius 1.5 m rolls down an incline that is 4 meters tall. What is the velocity of the thin hoop at the bottom of the incline?

m/s



Part c.
A solid disk of mass 22 kg and radius 1.5 m rolls down an incline that is 4 meters tall. What is the velocity of the solid disk at the bottom of the incline?

m/s

5.

[–/1 Points]DETAILSMY NOTES

A 10.3 kg tire that has a moment of inertia of 2340 kgm^2 is initially turning at 20.5 revolutions/s. It coasts to rest after 131 revolutions. What is the magnitude of the torque that slowed it?

N-m

6.

[–/1 Points]DETAILSMY NOTES

With her arms held against her body, a figure skater has a moment of inertia of 0.65 kg-m^2. With her arms extended, her rotational speed is 0.21 rev/s. But when she draws in her arms, her rotational speed is 0.74 rev/s. What is her moment of inertia when her arms are extended?

kg-m^2

Make an essay of 2-3 paragraphs and discuss the nature of an exponentially growing quantity. Describe its characteristics. Discuss population growth as an example. Discuss the impact of population growth on the demand for electric power in the U.S. Explain why electric power use can grow faster than population growth. What impact does this have on quality of life issues, both for the general public, and those in the energy industries? What’s the impact on energy resource, and disposal of waste products such as greenhouse gasses and nuclear waste?