Una masa conectada a un resorte ejecuta MAS. Cuando la masa está en su desplazamiento máximo desde la posición de equilibrio, su velocidad instantánea

a)Es máxima.

b)Es menor que máxima, pero no cero.

c)Es cero.

d)No puede determinarse sin la información de la masa.

e)No puede determinarse sin la información de la constante del resorte.

If you had your choice, would you prefer to purchase a Defined Contribution Pension Plan or a Defined Benefit Pension Plan? Is one better than the other? Explain your answer

A gas is confined to a cylindrical volume with a movable piston on one end. Initiall, the volume of the container is 0.160 m^3, and the gas is at 315 K. The gas is heated, but the piston is moved such that the temperature of the gas remains constant.

If there are 1.60 moles of gas in the container, write an equation for the pressure of the gas as a function of the volume of the container. (Assume SI units, and do not include units in your answer. Use the variable, V, as necessary.)

You bend a rod made of three equally-sized nonconducting segments (total length πR) into a semicircular arc. The outer two segments carry uniformly distributed charges of −q and the center segment is electrically neutral. Find the electric field at the center of the arc

Two tiny spheres of mass m = 8.80mg carry charges of equal magnitude, 72.0 nC, but opposite sign. They are tied to the same ceiling hook by light strings of length 0.530 m. When a horizontal uniform electric field E that is directed to the left is turned on, the spheres hang at rest with the angle ? between the strings equal to 50.0?in the following figure

A particle of mass 0.000117 g and charge 15 mC moves in a region of space where the electric field is uniform and is 4.5 N/C in the x direction and zero in the y and z direction. If the initial velocity of the particle is given by vy = 3.6 × 10^5 m/s, vx = vz = 0, what is the speed of the particle at 0.7 s? Answer in units of m/s.

1. A 40.0-kg girl stands on a 15.0-kg wagon holding two 19.5-kg weights. She throws the weights horizontally off the back of the wagon at a speed of 5.0 m/s relative to herself .

A. Assuming that the wagon was at rest initially, what is the speed of the girl relative to the ground after she throws both weights at the same time?

B. Assuming that the wagon was at rest initially, what is the speed relative to the ground with which the girl will move after she throws the weights one at a time, each with a speed of 5.0 m/s relative to herself?

2. A 740.0 N man, carrying a 1.7 kg physics textbook, stands at the center of a frozen pond of radius 5.0 m. He is unable to get to the other side since there is no friction at all between his shoes and the ice. To overcome his difficulty, he throws his textbook horizontally at a speed of 7.0 m/s toward the north shore. How long (in s) does it take him to reach the south shore?

What is the velocity and period of a satellite orbiting planet earth?

Answer using a Gravitacional approach*

A blood transfusion is being set up in an emergency room for an accident victim. Blood has a density of1060 kg/m³ and a viscosity of 4.0

A charge q₁=4.10 mCis located at the origin of a coordinate system. Another charge q₂=4.80 mC is located at x=-1.70 m and y=-4.50 m, and another q₃=4.20 mC is located at x=-2.30 m and y=1.20 m. Calculate the magnitude of the net electric force on the charge q₁ in Newtons (N).

How much total heat transfer is necessary to lower the temperature of 0.315 kg0.315 kg of steam from 145.5 °C145.5 °C to −15.5 °C,−15.5 °C, including the energy for phase changes?

total heat transfer:

JJ

How much time is required for each stage of this process, assuming a constant 835.0 W835.0 W rate of heat exchange? Give the times in the order that the stages occur.

t1=t1=

ss

t2=t2=

ss

t3=t3=

ss

t4=t4=

ss

t5=t5=

ss

Question Credit: OpenStax College Physics

The electrons in a cathode ray tube are emitted by a hot filament cathode and are accelerated by an electric field applied between the cathode and two orthogonal pairs of parallel plate electrodes. The beam passes through the gap between the electrodes and can be deflected up and down, or left and right if the parallel plates are appropriately biased. As the electrons pass through the electrodes, their kinetic energy increases. Assume the electrons are emitted from the cathode with a thermal velocity corresponding to a temperature of 3000 °C, are accelerated through a potential of 5000 V over a distance of 10 mm and then travel horizontally over a distance of 200 mm before they are collected on the phosphor-coated surface of the display screen. (a) Write the equation of motion for the electrons. Assume the electric field acts only in the x-direction between the cathode and the plates. (b) Calculate the velocity of the electrons after they have been electrostatically accelerated. (c) Calculate the downward deflection of the electrons over the 200 mm gap caused by the gravitational force acting in the negative y-direction. Use Vthermal = (8kT/pi*m)1/2 where m is the mass of the electron.

Two 2.0-cm-diameter insulating spheres have a 5.60 cm space between them. One sphere is charged to + 40.0 nC , the other to - 60.0 nC .

Part A

What is the electric field strength at the midpoint between the two spheres?

Pendulum Lab.. List each measurement name, a representative value [Units] ± σ with explanation. Your two measurements were Length and Period.

Consider a particle in an infinite square well, but instead of having the well from 0 to L as we have done in the past, it is now centered at 0 and the walls are at x = −L/2 and x = L/2.

(a) Draw the first four energy eigenstates of this well.

(b) Write the eigenfunctions for each of these eigenstates.

(c) What are the energy eigenvalues for this system?

(d) Can you find a general expression for the energy eigenstates for this well? (Hint: you should have a different form for even and odd solutions) (e) If instead, the well were from x = −L to x = L, how would these expressions change? Would the energy eigenvalues change? (And if so, how?)