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

1. Person A has twice the mass of person B. If they are placed at both sides of the seesaw and are at equilibrium, then

A. person a is half as far from the folcrum as person B

B. person A is 1/4 as far from the folcrum as person B

C. person A is 4 times farther away from the folcrum as person B

D. person A is twice as far away from the folcrum as person B

Wanted to understand the physics behind usage of passive antennae and matched load combination, to absorb, control and reduce the Electromagnetic-Field (s.a. due to microwave radiation from cellular phone towers), within a confined area (s.a. a room). Also, does the shape / size / material used for the antenna have a role to play ? If this kind of absorption does work, what might be the range / shape of the area that such a device can reduce / remove the radiation from ?

I have come across EMF shielding/reduction solutions which use such combination, and also some sort of Faraday-cage effect to keep out EMF radiation, which require "grounding". Are these two based on similar / related principles ?

Finally, I read in an article that not grounding the Faraday-cage (or the metallic protective shield), results in the metal starting to becoming radioactive, or maybe even emit X-rays.

Please do excuse the rather layman approach to the questions, a dumbed-down but factual (i.e. can be backed by theory and empirical data, if required) explanation would be highly appreciated.

At the beach, some waves with wavelength of 100 m propagate towards the shore at a speed of 12.5 m/s. (c) Does the engine sound higher- or lower-pitched to someone standing on the shore, compared with the experience of people on the boat?

(a) Calculate the frequency that boat anchored near shore bobs up and down as the waves roll in.

(b) At what frequency the boat would bob up and down with if it were headed away from the shore at a speed of 4.8 m/s?

(c) At what frequency the boat would bob up and down with if it were headed toward the shore at a speed of 4.8 m/s?