tutor123

Which of the following are quadratic equations?

a.  

b.  

c.  

d.  

e.    

f.  

This is a physics problem on the wave anatomy

I'm stuck on question 2 I'm not sure how I should approach this question it would be great if you can show all the working out.

The electric field strength near the surface of Earth is about 300V/m.

(a) Calculate the magnitude of the charge density on the surface ofEarth.

(b) Calculate the total charge on Earth.


(c) What is the value of the electric potential at Earth's surface? (Assume the potential is zero at infinity.)

Enumerate the possible values of the total orbital angular momentum l and m_l for two-electron in an l = 5 and l =2 states.

1. Graph the following functions include base function and state the doman and range for both functions: y= 1/x+3-7, 

What becomes of the momentum and the kinetic energy of a meteorite that comes into the earth's atmosphere and breaks up into many pieces?

Calculate the beat frequency f_beat for values of v=29 m/s. (Use the following as necessary: f_{source=8.5 GHz}, c, and v.)

A highway patrolman sends a 23.150 GHz radar beam toward a speeding car. The reflected wave is lower in frequency by 4.04kHz.


What is the speed of the car? [Hint: For small values of, the following approximation may be used: (1+x)² = 1+2x.]

True or false: If a sealed plastic container of water is squeezed only at the bottom, the water molecules in the squeezed region will experience increased pressure but water in the non-squeezed region will experience no change of pressure

Part B: (Part A already answered)What if the people were on initially and then jumped off in a radial direction (relative to the merry-go-round)?

• If your car is stuck in the mud and you don’t have a winch to pull it out, you can use a piece of rope and a tree to do the trick. First, you tie one end of the rope to your car and the other to a tree, then pull as hard as you can on the middle of the rope, as shown in the figure. This technique applies a force to the car much larger than the force that you can apply directly. To see why the car experiences such a large force, look at the forces acting on the center point of the rope, as shown in the figure. The sum of the forces is zero, thus the tension is much greater than the force you apply. It is this tension force that acts on the car and, with luck, pulls it free.
  
  1.) The sum of the three forces acting on the center point of the rope is assumed to be zero because
  a.) this point has a very small mass
  b.) tension forces in a rope always cancel
  c.) this point is not accelerating
  d.) the angle of deflection is very small.
  
  2.) when you are pulling on the rope what is the approximate direction of the tension force on the tree?
  a.) north b.) south c.) east d.) west
  
  3.) assume that you are pulling on the rope but the car is not moving. what is the approximate direction of the force of the mud on the car?
  a.) north b.) south c.) east d.) west
  
  4.) suppose your efforts work, and the car begins to move forward out of the mud. As it does so, the force of the car on the rope is
  a.) zero
  b.) less than the force of the rope on the car
  c.) equal to the force of the rope on the car
  d.) greater than the force of the rope on the car.

Consider the following.

(a) Calculate the absolute pressure at the bottom of a freshwater lake at a depth of 32.9 m. Assume the density of the water is 1.00x 10³ kg/m³ and the air above is at a pressure of 101.3 kPa.

(b) What force is exerted by the water on the window of an underwater vehicle at this depth if the window is circular and has a diameter of 32.6 cm?

A cup containing 45 g of water at 87.4°C has a 14.2 g piece of unknown metal placed into it. After some time the water cools and the metal warms up to a final temperature of 86.9°C. We will assume that the energy loss by the water is gained by the metal in this perfectly insulated situation calculate the specific heat capacity of the unknown metal the specific heat capacity of water is 4180 J/Kg/degree Celsius .

True Or False?

1) A solid metallic conductor in the shape of a football is given a net positive charge.
The excess positive charge, as predicted by Gauss's law, is uniformly distributed over the surface of the conductor.


2) An excess charge Q is added to an isolated metal object of irregular shape.
No matter how you change the shape of this metal object,
this excess charge will always be found on its outside surface if it remains isolated.

3) Two spheres contain the same charge Q, but one sphere is twice the diameter of the other. The electric flux through the surface of the larger sphere is 4 times as great as the flux through the smaller sphere.

By considering the visible spectrum of hydrogen and Helium. show how you could determine spectroscopically if a sample of hydrogen was contaminated with helium?

Give a reason why all mesons are formed from a quark and an anti-quark.

In a particular Bohr orbit for an electron in a He+ ion, the total energy is -6.044 eV. What is the kinetic and potential energy for the electron in this orbit?

What is the ionization energy to completely remove the electron from this orbit?

draw a model of the atom shown in the atomic box below . be sure toplace all the protons elcctrons and neutrons in the correctlocation

16 Si 28.085

Below are six crates at rest on level surfaces. The crates have different masses and the frictional coefficients between the crates and the surfaces differ. The same external force is applied to each crate, but none of the crates move.

Two foil balloons with a charge of +3.37 C and -8.21 C are 200.0 cm apart

a) determine the electrostatic force between them

b) If the two foil balloons are touched together and then returned to their original separation distance, determine the electrostatic force between them.

The period of a simple pendulum is 2.8 s. The length of the pendulum is doubled. What is period T of the longer pendulum?

If the death star has a mass of 9.5x10²³ and a gravitational field strength of 6.5 N/kg.

a. find the radius of the death star

b. If a 500 kg starfighter is circling the death star at a distance of 1500 km from the surface, what force of gravity his he experiencing?

An idealized ammeter is connected to a battery as shown below. Find (a) the reading of the ammeter, 
(b) the current through the 4.00-Ω resistor, (c) the terminal voltage of the battery.

A spool of copper wire 290 m long and with a diameter of 0.360 mm is at 20.0°C. For copper, the resistivity is 1.70 x 10 ^-8. m and the temperature coefficient of resistivity is 3.90 x 10-3 (°C)^-1. (a) What is the magnitude of the electric field (in V/m) in the wire if it carries a current of 0.450 A? V/m (b) What is the electric power in W) delivered to the spool while it carries a current of 0.450 A? W (c) What is the power in (W) delivered to the spool if the potential difference across the wire is held constant and the temperature is increased to 310°C? W

The graph below shows the photon energy spectrum for a hypothetical filtered X-ray tube. The labels H, J, and K refer to the horizontal positions of the identified features while G refers to the area under the curve.

An applied force of 4.5 N acts on a 1.5 kg blaster, pushing it horizontally across a surface where the coefficient of kinetic friction is 0.15. (g=9.81 m/s²)

a. determine the frictional force acting

b. determine the object's acceleration

The hour, minute, and second hands on a clock are 0.25, 0.31, and 0.34 long, respectively. What are the distances traveled by the tips of the hands in a 45-minute interval?

Attached is a photo of a electromagnetics question, I beleve that gauss's law will have to be used to solve the problem. 

Green light has a wavelength of 500nm. What is the minimumthickness of a soap film (suspended in air) for which this filmwill appear green?

My professor has 2d= lambda/2 d= lambda/4= 500/4= 125nm

What I am confused about is why he used 2d=lambda/2. How do I knowto use a constructive equation vs. a destructive one. lambda,2lambda, 3lambda [or] lambda/2, lambda3/2, lambda5/2.

Phill out the graphs Show the calculation

A spring is hung vertically with a mass of 0.75 kg attached. It is displaced 4.0 cm from equilibrium when this mass is attached. Find the following: a) The force constant on the spring. (provide a free-body diagram) b) The work done by the spring on the mass as it stretches through the distance. c) If the same mass instead had the work done by the mass on the spring equal to 0.325 J, what displacement would it experience.

A 1.70-mm string of weight 0.0122 NN is tied to the ceiling at its upper end, and the lower end supports a weight WW. Neglect the very small variation in tension along the length of the string that is produced by the weight of the string. When you pluck the string slightly, the waves traveling up the string obey the equation
y(x,t)=(8.50mm)cos(172rad⋅m−1x−2730rad⋅s−1t)y(x,t)=(8.50mm)cos(172rad⋅m−1x−2730rad⋅s−1t)
Assume that the tension of the string is constant and equal to W. How much time does it take a pulse to travel the 

A meteoroid is speeding through the atmosphere, travelling East at 15.6 km/s while descending at 16.7 km/s.  What is its speed, in km/s?

A rocket is launched off the ground in which the foot pump produces 20N on the rocket (m = 200g) for 0.15 seconds. *Neglect air resistance*

a. Draw an F.B.D. when the force is being applied to the rocket.

b. What is the acceleration of the rocket as it is launched? 

C. How far does the rocket travel during the time the force is applied?

d. Draw an F.B.D. when the force is no longer applied (while travelling in the air).

e. At the end þf the Force Applied, what is the:

i. Velocity of the rocket? ii. Velocity of the rocket (horizontally)? iii. Velocity of the rocket (vertically)?

Two parallel plates are 2.5 cm apart. If the electric field strength between the plates is 2.0x10^3 V/m, what is the potential difference between that plates?

A proton gained 1.50x10^-15  J of kinetic energy when it passes through a potential difference. What was the magnitude of the potential difference that accelerated the proton?

Two parallel plates are connected to a 9.0v battery. If the plates are 1.00x10^-1 m apart, what is the electric field strength between them?

and the electric field between two parallel plates is 1.00x10^4 V/m. If the potential difference between the plates is 115 V, how far apart are the plates?

How do Kinematics and Forces exactly relate to a stomp rocket?

The graph below shows the photon energy spectrum for a hypothetical filtered X-ray tube. The
labels H, J and K refers to the horizontal positions of the identified features while G refers to the
area under the curve

Attached is a photo of an electromagnetism question. I believe that gauss's theorem will have to be used for the electric field portion of the problem.