When two waves in the same medium hit each other, the resulting displacement of the medium is

A ball of mass 8.1 g with a speed of 22.6 m/s strikes a wall at an angle 11.0o and then rebounds with the same speed and angle. It is in contact with the wall for 44.0 ms. What is the magnitude of the impulse associated with the collision force?

For astronomy class, please answer this question comprehensively thank you.

We have detected a sudden minor increase in the solar wind from the Sun. The density and speed of material headed towards Earth has increased at a slow rate. Shortly before this satellites in orbit of the Sun noted a large loop of material arcing from the surface of the Sun which then fell back onto the Sun. Identify and explain what type of solar event has just been described. Are the dangers from this solar event more likely to damage satellites, ground-based power grids, and/or unprotected astronauts.

A capacitor is connected to an ac generator that has a frequency of 3.2 kHz and produces a rms voltage of 1.3 V. The rms current in the capacitor is 29 mA. When the same capacitor is connected to a second ac generator that has a frequency of 5.1 kHz, the rms current in the capacitor is 86mA. What rms voltage does the second generator produce?

Q. 1: (a) Write down de Broglie’s formula in terms of Kinetic Energy Ek of the particle involved.

(b) Calculate the electron’s and proton’s de Broglie wavelengths when each of them has kinetic energy 25x10-3eV.

(c) The de-Broglie wavelength of electron-beam used in the electron-microscope is 40 pico-meters. The electron-beam is accelerated from rest using potential difference Va, determine the applied voltage.

1) What do you understand by change in the direction and change in the speed of a body?

2) What is the difference between instantaneous and average speed?

3) What differences do you find between "momentum" and momentum conservation (also indicate the units in which they are measured)?

4)  What difference do you find between “a constant and a variable force” (also indicate an example of each)?

What is the difference between work function and electron affinity energy? Is there any relation between work function and electron affinity energy?

1) A projectile has the least speed at what point in its path?

a) At its maximum height.

b) Just before it hits the ground.

c) Just after it's fired.

d) After three seconds of travel.

2) The magnitude of a vector can never equal the length of one of its components.

True

False

3) Can a particle with a constant speed ever be accelerating?

a) Yes, because acceleration and velocity are unrelated.

b) No, because its speed is constant.

c) Yes, because it's speed is changing.

d) Yes, if it's changing direction.

A worker is trying to push a crate across the floor in the rightward direction with a horizontal force of 15N. The crate does not move. The mass of the crate is 10kg. The coefficient of static friction is 0.25, and the coefficient of kinetic friction is 0.15. (1) what is the friction on the crate? Give both magnitude and direction of the friction. (2) He then pulls the right edge of the crate with a force of 50N at an angle \Theta =30degrees above the x-axis. Does the crate move? Justify your answer quantitatively. (3) what is the acceleration of the crate if it moves? (4) what is the work done by the workers force when the crate moves 4 meters? (5) what is the work done by the gravitational force in that 4-meters distance? (6) What us the thermal energy dissipated during the move?

Consider a charged disk of radius R on the x-z plane with its centre at the origin. The disk has a positive charge density σ. (a) Find, from first principles, an expression for the electric field of this disk at point P (0,yP,0) on the axis of the disk. (b) A second identical charged disk is now placed at a distance d parallel to the first, with its center at (0,d,0). Find the net electric field due to both disks at a point half way between the two disks at H (0,d/2,0). (c) A positive charge Q is now placed at H.

Use the results of part (b) to write an expression for the electric force acting on this charge. (d) What happens to charge Q if is displaced from H by a very small amount, y (y<<d/2), on the y-axis. Use Newton’s 2nd Law to discuss the motion of Q.

In class, we showed the equation for electroosmotic mobility and electrophoretic mobility. Using these two equations, derive the equation for v_total and t_m. Recall the equation for v_ep = µ_eE and v_eo = µ_eoE

Q = Make quark model for spin 0 meson.

attempt only if you are sure, i will downvote wrong or guessed answer.

1. A certain spring is compressed 0.2 metres from its natural length by a force of 0.02 newtons. A 0.1 kilogram mass is attached to this spring. There is no damping, and the mass is acted on by an external force of 0.05 cos(0.8 t) newtons, where t is measured in seconds. At t = 0, the mass is released, at rest, from its rest (equilibrium) position.

   1. (a) Set up and solve the initial value problem for the displacement x(t) of the mass from its rest (equilibrium) position, where x is measured in metres. Express x(t) as a sum of sinusoidal (i.e. sine or cosine) functions of t.

   2. (b) Express x(t) from part (a) as a product of sinusoidal functions of t, and identify the two “envelope” functions that x(t) oscillates between.

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air resistance is negligible, and the collision is elastic. The masses of the ball and block are, respectively, 1.6 kg and 2.3 kg, and the length of the wire is 1.21 m. Find the velocity (magnitude and direction) of the ball (a) just before the collision, and (b) just after the collision.

In the figure particle 1 of charge +q and particle 2 of charge +4q are held at separation L = 8.38 cm on an x axis. If particle 3 of charge q₃ is to be located such that the three particles remain in place when released, what must be the (a) x and (b) y coordinates of particle 3 and (c) the ratio q₃/q?