Physics Questions and Answers January 13, 2020

Suppose we scale up a given black hole binary. That is, we increase M and q by the same factor, and keep D the same. How will that affect the other quantities?

Show that the output power by a standard siren, as it approaches merger, will be of order unity (or c 5 /G in non-Planckian units), no matter what M is. Then consider a Hubble volume, that is, a sphere of comoving radius 1/H 0 . If the entire baryonic mass in a Hubble volume radiates with the Eddington luminosity (a considerable overestimate) what

This project involves an investigation of the relationship between altitude, velocity, and acceleration of the Falcon 9 Rocket. Using velocity data for a Falcon 9 ight and notions of the derivative, Riemann sum, and integral you will make predictions about the rockets altitude and acceleration. Each group should email me a project report that

A platform weighing 1.3 kg (force) is attached to a spring-damper system with a spring constant of 100N/m. The damper is adjustable. If the damper is adjusted to the critical value, how long will it take for the system to recover 90 percent of the displaced value of a step input?

An astronaut takes his bathroom scale to the moon and then stands on it. Is the reading of the scale his true weight? Select the correct explanation. An astronaut takes his bathroom scale to the moon and then stands on it. Is the reading of the scale his true weight? Select the correct explanation: A. The reading on the moon will be the

An RC parallel circuit has an applied voltage of 220V and a total current draw of Amps. The resistor has a value of 176 ohms. What is the value of reactance XC?

Three capacitors connected in parallel have capacitive reactances of 24 ohm, 48 ohm, and 36 ohm. If these capacitors are connected to a 60Hz line, what is the total capacitance of the circuit?

Three capacitors connected in series have capacitancess of 2.6uF, 5.2u5 and 7.8uF. If these capacitances are connected to a 277V, 400Hz line, how much current will flow in the line?

Describe the field of sound vibration in a gas in the Hamiltanian formalism and obtain the corresponding Hamilton equations of motion.

Generalizing the momentum expansion to a vector field, express the Hamiltanian for the acoustic modes of a gas in the momentum representation.

For the data shown in Fig. P2.2, determine the following. (a) The stick fixed neutral point. (b) If we wish to fly the airplane at a velocity of 125 fts at sea level, what would be the trim lift coefficient and what would be the elevator angle for trim w 2,750 lb S 180 ft 2 cg 0.25 7 0.15 0.10 0.05 CL 0.0 0.6 0.8 1.0 0.2 0.4 de 15 0.05 10 0.10

Most modern applications of electricity involve moving electric charges or current electricity. Historically, however, the first studies of electricity involved static charges or electrostatics. You certainly feel the effects of electrostatic charges every time you touch a doorknob in the wintertime and get zapped. In this lab, you will be

ball stem metal case go ld Teaf glass side wall Fig.1. Electroscope

Neglect the weight and thickness of the bar shown in Figure #4 below. The beam is supported A by a pin and at B by a roller. Determine the reactions at the supports.

300 N 2 m 2 m 2 m Figure 4

Some revisionist scholars attribute the Civil War to a "blundering generation" of political leaders. Who were these leaders and what blunders did they make? Could better decisions have avoided war?

You want to design a large, permanent space station so that no artificial gravity is necessary. You decide to shape it like a large coffee can of radius 223 m and rotate it about its central axis. a)What rotational speed would be required to simulate gravity? The acceleration of gravity is 9.8 m/s 2 . b) If an astronaut jogged in the direction of

I radius 223 m