A 1500-N uniform boom at ? = 68.0

Alice is driving a race car around an essentially circular track.  Brian, who is sitting at a fixed position at the edge of the track, measures the time that Alice takes to complete a lap by starting his watch when Alice passes by his position (call this event E) and stopping it when Alice passes his positin again (call this event F).  This situation is also observed by Cara and Dave, who are passengers in a train that passes very close to Brian.  Cara happens to be passing Brian just as Alice passes Brian for the first time, and Dave happens to pass Brian just as Alice passes Brian the second time.  Assume that the clocks used by Alice, Brian, and Cara are close enough together so that we can consider them all to be "present" at event E, and similarily that those used by Alice, Brian, and Dave are "present" at event F.  Assume that the ground frame is an inertial reference frame.

Who measures:

a) the proper time,

b) the coordinate time,

c) and the spacetime interval between events E and F?

Explain why.

A heat engine operates between a high-temperature reservoir at 610 K and a low-temperature reservoir at 320 K. In one cycle, the engine absorbs 6800 J of heat from the high-temperature reservoir and does 2200 J of work.

A) What is the net change in entropy as a result of this cycle?

Brief timeline of the development of the theory and or technology and key players of the physics of Particle and Wave detection

Should the maximum angular velocity of the shank coincide with ball contact? Explain why or why not.

Discuss examples of when a naturalistic observational study would be the most appropriate design to select.

Two 2.1-mm-diameter beads, C and D, are 10 mm apart, measured between their centers. Bead C has mass 1.0 g and charge 1.6 nC. Bead D has mass 2.3 g and charge -1.0 nC.

1) If the beads are released from rest, what is the speed v_C of C at the instant the beads collide?

2) What is the speed v_D of D at the instant the beads collide?

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?