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?

As shown in the figure below, two blocks (m₁ and m₂) are each released from rest at a height of  

h = 4.68 m

on a frictionless track and when they meet on the horizontal section of the track they undergo an elastic collision. If

m₁ = 2.50 kg

and

m₂ = 4.05 kg,

determine the maximum heights to which they rise after the collision. Use the coordinate system shown in the figure.

y1f =	m
y2f =	m.

A 2.90-cm-high object is situated 11.6 cm in front of a concave mirror that has a radius of curvature of 11.2 cm. Calculate (a) the location and (b) the height of the image.

During the middle of a family picnic, Barry Allen received a message that his friends Bruce and Hal needed to be saved. Barry promised his wife Iris that he would be back in exactly 5 minutes. From that that picnic location, Barry runs at a speed of 600 m/s for 2 minutes at a heading of 35° north of west to save Bruce. He then changed his heading to 30° west of north, slows down to 400 m/s and runs for 1 minute to save Hal. (The changes in speed are essentially instantaneous and not part of solving this problem). (a) Draw a physical representation of the displacement during Barry’s full trip. (b) Use the Related Quantities sense-making technique to compare Barry’s total distance traveled to the magnitude of his displacement. (c) What average velocity (magnitude and direction) does Barry need to return back to the picnic in order to keep his promise to Iris?

The visible spectrum is in the 400-700 nm range, and contains about 40% of the sun’s radiation intensity. Using the Planck Distribution, write an integral expression that can be evaluated to give this result (do not evaluate the integral).

What is the energy released in this β + nuclear reaction 29 16 S → 29 15 P + 0 1 e ? (The atomic mass of 29 S is 28.996615 u and that of 29 P is 28.9818 u)

13.3 MeV is incorrect

An object with a charge of -3.2 ?C and a mass of 1.6×10^?2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight.

A) Find the magnitude of the electric field.

Answer: E = 4.9×10⁴ N/C

B) Find the direction of the electric field.

Answer: Downward

C ) If the electric charge on the object is doubled while its mass remains the same, find the direction and magnitude of its acceleration.

Express your answer using three significant figures.

a =		m/s2

D) If the electric charge on the object is doubled while its mass remains the same, find the direction and magnitude of its acceleration.

upward

downward

to the left

to the right