1. Describe location in the universe.

2. Compare and contrast distance, time, and speed.

3. Discuss the speed of light and the theory of special relativity.

4. Discuss inertia and momentum and the difficulties accelerating to speed of light.

5. Compare and contrast Solar Sails, Ion Engines, and Warp Drives - accelerating in space.

Astronomers estimate that there are between 200 billion to 400 billion stars contained within the Milky Way and Andromeda Galaxy probably has 1 trillion stars. There may be around 500 billion galaxies in the observable universe.

So, my question is, statistically speaking because of the number of stars, there is should be lots of chances of stars going supernova; where at times they glow brighter than a whole galaxy. Why then do we not see many supernovas, for example like the 1987A? Why have we not been able to see one in our own galaxy since the SNR G1. Should there not be more supernovas in surrounding galaxies and even our own one as it has around 400 billion stars.

I appreciate that there are different types of stars and various life span, but our galaxy being almost as old as the universe, surely there should be stars dying all the time.

3.   Resistors and capacitors are not marked with their exact values, but only approximate values with a tolerance. Determine the tolerance marked on the resistors and capacitors you are using. If there is a discrepancy between the two quantities compared in Question 2, can the tolerance values explain the difference?

7.What fraction of the initial potential remains after one time constant has passed? After two time constants? Three?

A pair of speakers separated by distance d = 0.640 m are driven by the same oscillator at a frequency of 681 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the figure below. (Use v = 343 m/s.) Two speakers are side by side, with one speaker on the left and one on the right. The speakers are separated by a distance d and emit sound waves in the same direction. A man stands directly in front of the speaker on the right but a distance x away from the speaker. (a) How far must the observer walk before reaching a relative maximum in intensity? m (b) How far will the observer be from the speaker when the first relative minimum is detected in the intensity? m

1. John detects a distant meteoroid moving toward earth on a straight line that is 3R_e from earth center as shown. She is assigned by NASA to find out if the meteoroid will be deflected toward earth and if so to what value its speed must be increased to avoid coming to earth.

What minimum speed did John calculate for the meteoroid to be moving in order not to be deflected toward earth by earth

Part 1 - A projectile is launched vertically from the surface of the Moon with an initial speed of 1170 m/s. At what altitude is the projectile's speed two-fifths its initial value?

Part 2 - A mass attached to a spring oscillates with a period of 3.11 s. If the mass starts from rest at x = 0.0440 m and time t = 0, where is it at time t = 2.83 s?

PLEASE POST THE ANSWERS TO BOTH PARTS CLEARLY, ALSO PLEASE RESPOND IF SOMETHING IS INCORRECT, THANK YOU!

explain difference limen for frequency and loudness difference limen

Fourier's theorem, which essentially states that a real-time function, such as the pressure changes occurring near the surface of the eardrum, can be converted into a spectral representation of the sound. In other words, a sound can be described in either the temporal domain or the frequency domain. Briefly discuss the importance of Fourier's theorem in relation to the physical aspects of sound and to the hearing sciences in general.

Light, heat ... energy - are all electromagnetic waves. Discuss the differences between them.

If you hold a spoon in front of your face so that you see your image in the bowl of the spoon, your image is upright when you hold the spoon close to your face, but inverted when you hold the spoon far away.

Construct the correct explanation why this change occurs.

Place the terms on the left to the appropriate blanks on the right to complete the sentences.

The spoon acts like a ____________   mirror. Light from your face is focused by the mirror.

If you are very close to the spoon (within the focal length) then the light rays ___________.

If you are farther from the spoon (beyond the focal length) then the light rays ___________.

Word Bank:

Converging

Diverging

From an inverted image

Are converged somewhat
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You are using a converging lens to look at a splinter in your finger. The lens has a 9.0 cm focal length, and you place the splinter 6.7 cm from the lens.

How far from the lens is the image?

Express your answer to two significant figures and include the appropriate units. Enter positive value if the image is on the other side from the lens and negative value if the image is on the same side.

Cart A traveling on a frictionless track at 6.0 m/s collides head-on with a 1.0 kg cart B traveling in the opposite direction at 4.8 m/s. After the collision, cart A does not move. If the collision is perfectly elastic, a) What is the final velocity of cart B? b) what is the inertia of cart A? c) what is the kinetic energy of cart B after the collision?

You are shooting pool with some friends of yours and are beautifully positioned to win the game by knocking the 8-ball into a corner pocket. In fact, all you need to do is strike the 8-ball head-on---it's just an ideal situation. Assuming you execute the shot, how fast will the cue ball be moving after hitting the 8-ball? (assume that the masses of all the pool balls are basically equal).

How fast will the 8-ball move as a factor of the initial speed of the cue ball? (that is, what's the ratio of the 8-balls final speed to the cue ball's initial speed?)

A magnetic field has a magnitude of 1.20 10-3 T, and an electric field has a magnitude of 5.20 103 N/C. Both fields point in the same direction. A positive 1.8-

The position of a particle attached to a vertical spring is given by y = (y0 cos ωt)j. The y axis points upward, y0 = 32.1 cm, and ω = 21.44 rad/s. (a) Find the displacement of the particle during the time interval from t = 0 to t = 8.5 s. (Round your answer to the nearest integer.)

(a) Find the displacement of the particle during the time interval from t = 0 to t = 8.5 s. (Round your answer to the nearest integer.)

(b) Find the distance (in centimeters) the particle traveled during this time interval.

(c) Many physical systems are modeled by a particle attached to a spring. List some examples of systems that may be modeled by springs. It may be helpful to use the index of this book or the Internet.

The wave function of a standing wave is y(x,t)=4.44mm sin[(32.5rad/m)x]sin[(754rad/s)t] For the two traveling waves that make up this standing wave A) Find the wave function B) Find what harmonic it is C) find wave speed