When a carpenter shuts off his circular saw, the 10.0-inch diameter blade slows from 4452 rpm to zero in 2.50 s .

A) What is the angular acceleration of the blade?

B) What is the distance traveled by a point on the rim of the blade during the deceleration?

C) What is the magnitude of the net displacement of a point on the rim of the blade during the deceleration?

A ball with a mass of 0.605kg is initially at rest. It is struck by a second ball having a mass of 0.430kg , initially moving with a velocity of 0.220m/s toward the right along the x axis. After the collision, the 0.430kg ball has a velocity of 0.215m/s at an angle of 36.0? above the x  axis in the first quadrant. Both balls move on a frictionless, horizontal surface.

What is the magnitude of the velocity of the 0.605kg ball after the collision?

What is the direction of the velocity of the 0.605kg ball after the collision?

What is the change in the total kinetic energy of the two balls as a result of the collision?

What is precipitate-free zone? How does it form? How to get rid of it? (20 pts)

Microwaves with a wavelength of 7 cm and sound waves with a wavelength of 7 cm are incident on a

12 cm wide slit. Which of the following is correct?

(a) The diffraction pattern from microwaves and sounds waves is different because the waves have

different velocities.

(b) The frequency of the light is less than that of the sound waves

(c) Both the microwaves and sounds waves have a maximum at about 36 degrees.

(d) Both the microwaves and sounds waves have a minimum at about 36 degrees.

A green laser beam is incident on a pair of narrow slits and an interference pattern is formed on

a distant screen. If the green laser is replaced with a red laser, with everything else the same, the

distance between the fringes will

(a) increase because green light has a longer wavelength than red light.

(b) increase because red light has a longer wavelength than green light.

(c) remain the same because the distance between the slits is doesn’t change.

(d) decrease because green light has a shorter wavelength than the red light.

(e) decrease because red light has a shorter wavelength than the greed light.

Describe what happens when you try to push a heavy box (> 200lbs) that has been sitting on the floor for some time a) before it starts to move b) right after it starts to move c) if it acquired an acceleration without you pushing it harder, explain why in details using static and kinetic forces of frictions and 2nd Newton

Okay for this question, I obviously don't need a quantity because I dont have any, but how would I approach this question in lab if asked:

"Quantify the scatter (or range) of the three resistance values as a percent of their averages"

I don't know what my answer should look like or what I'm supposed to do with the resistance values

A beam of sound waves of a specific frequency and intensity is passed from one medium into another, arriving at the interface at an angle that is not perpendicular to the interface. Identify TWO aspects of this sound wave that will be different about this beam now that it is travelling in the second medium compared to when it was in the first medium. Explain your answer.

I have a question that I would like to ask here since I'm not an expert or any near to that. Actually I just came up with this question when I was watching The fabric of cosmos. I couldn't find where I can ask this kind of question. So hopefully this is the right place.

What is the "background" of multiverse?

Let me elaborate a little more what that means clearly. As far as I understand, multiverse is a cluster of many universe and it seems like (well from what I saw in documentary) that bubbles in a cup of soda.

What I am curious is that then what is the mechanism of the background or surrounding, I should say, of the multiverse? Since if multiverse "exists" somewhere, then that means the surrounding has to have some kind of characteristics, such as space-time.

I hope that I explained comprehensibly, and somebody can give some reasonable explanation. Even better, any book recommendation would be appreciated!

Even though I studied physics for 1 year and half, I forgot many of them except curiosity. ;)

2. The atmospheric pressure at the sea level is greater than the atmospheric pressure at the mountain top (T,F)

A baseball thrown at an angle of 65.0 ∘ above the horizontal strikes a building 18.0 m away at a point 8.00 m above the point from which it is thrown. Ignore air resistance.

A. Find the magnitude of the initial velocity of the baseball (the velocity with which the baseball is thrown).

B.Find the magnitude of the velocity of the baseball just before it strikes the building.

C.Find the direction of the velocity of the baseball just before it strikes the building.

1. show that critical damping provides the quickest approach to zero amplitude. With less damping (“underdamping”), it reaches the zero position more quickly, but oscillates around it

Please explain in detail

A horizontal pipe carries a smoothly flowing liquid with density 1.39 × 103 kg/m3. At locations 1 and 2 along the pipe the diameters are 5.23 cm and 2.19 cm, respectively. The flow speed at location 1 is 1.79 m/s. What is the pressure difference between location 2 and location 1 (including its sign)? Ignore viscosity.

A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 2.0 m/s, skates by with the puck. After 2.60 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 0.36 m/s², determine each of the following.

(a) How long does it take him to catch his opponent? (Assume the player with the puck remains in motion at constant speed.)
                     s

(b) How far has he traveled in that time?
                       m

You have two glasses of water each with equal amount of it. In glass “A” the temperature of the water is 10 ◦C. In glass “B” the temperature of the water is 30 ◦C. (4/20 credits)
a) The water in glass A has more internal energy

b) The water in glass B has more internal energy c) They have equal amount of internal energy

What formula did you use to derive your answer?