A hockey puck B rests on frictionless, level ice, and is struck by a second identical puck A, which was originally moving at 50 m/s and is deflected at 30 degrees from its original direction. Puck B acquires a velocity at a 45 degree angle in the other direction. (Let the mass of the puck be m)

A) Find the speed of each puck after the collision.

B) What fraction of the original kinetic energy of puck A disipates during the collision? (As a decimal)

A platinum sphere with radius 0.0161 m is totally immersed in mercury.The densities of platinum and mercury are 2.14*10^4 kg/m3 and 1.36*10^4 kg/m3, respectively.

Find the weight of the sphere, the buoyant force acting on the sphere, and the sphere\'s apparent weight.

The output of a generator is 440 V at 20 A. It is to be transmitted on a line with resistance of

0.60 ?. To what voltage must the generator output be stepped up with a transformer if the
power loss in transmission is not to exceed 0.010% of the original power?
A) 7.3 kV B) 45 kV C) 22 kV D) 30 kW E) 4.4 kV

Briefly explain why there are energy bands (and not individual levels) in semiconductors.

Describe three different ways of creating an induced voltage (or current) from changing magnetic flux. I am looking for just a few lines of text, a sketch of each scenario, and an indication of which term in the magnetic flux equation is changing to produce the voltage (or current). Which method is the most practical for generating voltage at a power plant?

Four identical particles of mass 0.929 kg each are placed at the vertices of a 3.40 m x 3.40 m square and held there by four massless rods, which form the sides of the square. What is the rotational inertia of this rigid body about an axis that (a) passes through the midpoints of opposite sides and lies in the plane of the square, (b) passes through the midpoint of one of the sides and is perpendicular to the plane of the square, and (c) lies in the plane of the square and passes through two diagonally opposite particles?

The archerfish uses a remarkable method for catching insects sitting on branches or leaves above the waterline. The fish rises to the surface and then shoots out a stream of water precisely aimed to knock the insect off its perch into the water, where the archerfish gobbles it up. Scientists have measured the speed of the water stream exiting the fish's mouth to be 3.7 m/s. An archerfish spots an insect sitting 21 cm above the waterline and a horizontal distance of 31 cm away. The fish aims its stream at an angle of 41 ∘ from the waterline. Determine the height above the waterline that the stream reaches at the horizontal position of the insect. DO NOT USE THE KINEMATIC EQUATIONS.

Hello, I have this question that I have been trying to solve for days. I am always able to solve the first part of the question, but I am never able to get the second part. Please help me understand how to set up this problem so I am able to solve it!

Q: Let's revisit the banked curves from earlier to see another reason they are useful.We are building a road, and at one place we need to make a turn with a radius of 30m.  The coefficient of static friction between rubber and the material we are using is 0.6.

Part A: Assuming that the road is flat through the turn, what is the maximum speed a car could have and safely navigate the turn without sliding off the road?

Part B: Instead of keeping the road flat, let's bank the turn a little bit, giving the road an angle of 20∘ above the horizontal. With the banked turn, what is the maximum speed a car could have and still make it around the turn without sliding?

The answer for part A is 13.3 m/s and the answer for part B is 19 m/s but I don't know how to get the answer for part B.

It lies in a one-dimensional box that is 0.1nm long. Find the following.
(1) Draw a diagram of the energy levels of electrons up to n=4.
(2) Obtain the wavelengths of all photons that could be released when electrons are transferred from n=4 to n=1.

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