1. 5) Which options below are true? [Enter your answer as a string of the letter options you believe are correct. For instance, if you think options A, D, and E are correct, then enter "ADE"]
   
   A) The strength of the total electric field extremely far away from the collection will be large if all the charges are the same sign.
   B) Electric field vectors only exist in the space right next to the charged particles.
   C) The electric force on a negatively charged target particle a small distance away from the sources will point opposite to the electric field created by the sources at target location.
   D) The electric field at a target location in space can only be fully determined when information about the target particle's electrical properties are given.
   E) None of the above

(Please note that I put this question up already and they got CD and it was wrong. This does not include that CD are wrong, there can be more right answers, one can be wrong, or both).

A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to scatter at an angle θ₂ = 52° from the neutron's initial direction. The neutron's initial speed is 52000·m/s.

Determine the angle at which the neutron scatters, θ₁, measured from its initial direction:

What is the speed of the neutron after the collision?

What is the speed of the helium nucleus after the collision?

A charge per unit length λ = +6.00 μC/m is uniformly distributed along the positive y-axis from y = 0 to y = +a = +0.500 m. A charge per unit length λ = -6.00 μC/m, is uniformly distributed along the negative y-axis from y = 0 to y = –a = -0.500 m. What is the magnitude of the electric field at a point on the x-axis a distance x = 0.431 m from the origin?

If glider #2 is at rest and located halfway in between the photogates. What will the resultant motion be if glider #1 is moving to the right with a speed of 0.5 m/sec and they stick together when they collide?

One liter of an ideal monatomic gas (gamma=5/3) at atmospheric pressure (1.0 atm) and a temperature of 300K is used in the following cycle: an adiabatic compression to one half its original volume, followed by a constant-volume cooling to 300K, followed by an isothermal expansion back to original volume. Determine the work done by the gas, the heat entering the gas and the change in thermal energy of the gas in each leg of the cycle. Organize answer in table. is this cycle allowed by the second law of thermodynamics? what kind of heat machine does this cycle represent? heat engine? refrigerator? explain

(a) How much work is done on the steam when 3.52 mol of water at 100°C boils and becomes 3.52 mol of steam at 100°C at 1.00 atm pressure? (Assume the latent heat of vaporization of water is 2.26 106 J/kg.) kJ

(b) Assume the steam to behave as an ideal gas. Determine the change in internal energy of the system of the water and steam as the water vaporizes. kJ

A curve of radius 75 m is banked for a design speed of 100 km/h .

If the coefficient of static friction is 0.36 (wet pavement), at what range of speeds can a car safely make the curve? [Hint: Consider the direction of the friction force when the car goes too slow or too fast.]

A horizontal pipe contains water at a pressure of 140 kPa flowing with a speed of 1.2 m/s . The pipe narrows to one-half its original diameter.

What is the speed of the water?

Express your answer using two significant figures.

What is the pressure of the water?

Express your answer using two significant figures.

A raft is made of 11 logs lashed together. Each is 34.0 cm in diameter and has a length of 5.50 m. How many people (whole number) can the raft hold before they start getting their feet wet, assuming the average person has a mass of 69.0 kg? Do not neglect the weight of the logs. Assume the density of wood is 600 kg/m³

As an aid in working this problem, consult Concept Simulation 26.3. A converging lens has a focal length of 87.00 cm. A 12.0 cm tall object is located 155.0 cm in front of this lens.

(a) What is the image distance? cm

(b) Is the image real or virtual?

real virtual?

(c) What is the image height? Be sure to include proper algebraic sign.
cm?

78.  A commuter train travels between two downtown stations. Because the stations are only 1.00 km apart, the train never reaches its maximum possible cruising speed. During rush hour the engineer minimizes the time interval ?t₁ between two stations by accelerating the rate a₁ = 0.100 m/s² for a time interval ?t₁ and then immediately braking with acceleration a₂ = ?0.500 m/s² for a time interval ?t₂. Find the minimum time interval ?tand the time interval ?t_1.

A beam of photons (q = +1.6 x 10^-19 C) is moving with various speeds in the positive x direction (to the right). It enters a region where there is a uniform magnetic field of magnitude 0.25T pointing in the negative z direction (into the page).

a) The protons feel a force due to this magnetic field. Explain why, and indicate the direction of the force.

b) Not all protons will feel a force of the same magnitude. Why?

c) As a result of the magnetic force, the protons will deviate from their speed original direction towards the right. It is desired that those protons traveling at a speed of 1.75*10^5 m/s don't deviate at all and continue on a straight path to the right. This is to be achieved by turning on an electric field in the same region as the magnetic field. In what direction should the electric field point? Explain.

d) Find the magnitude of the electric field necessary to achieve the result of the previous question.

The ball launcher in a pinball machine has a spring that has a force constant of 1.20 N/cm (Fig. P7.63). The surface on which the ball moves is inclined 10.0

You measure the emission spectrum of hydrogen gas, and see many discrete wavelengths in the emission, of which, one is 102.6nm. To what initial and final states can this wavelength be attributed?. (hint, use a little trial and error to get the intergers)

You see a vehicle move from x= +11.6m to x= +21.8m in a time of 4.76s. If you know that the constant acceleration is 3.65 m/2^2 determine the initial velocity of the vehicle.

Any help is much appreciated. Thanks!