Jim

If so,

and

since all measured quantities of physics have UNITS, what are inertia units..say in the SI system of measurement?

Assuming the Earth to be a sphere with Radius = 6,380 km, what would the length of a day have to be in order to become weightless? {a day = period of Earth's rotation}.

For curiosity I've been measuring background radiation outdoors in an Eastern state to see if I there was any measurable change this week due to the winds coming from Japan. Today the average counts per minute was one(1) count higher {at 18 cts/m} over the average of each day up until today.

My instrument's millirem/hour {equivalent dose rate} is determined by dividing counts/min by 1000.

Assuming this added one count per minute remains constant as additional background radiation. What is this additional radiation going to add to an Eastern USA resident's yearly millirem total? _______ (a)

Compare this additional annual radiation to that of a single chest X-ray? _________ (b)

The SI dose equivalent UNIT of radiation = the Sievert {Sv} = 1.00 J/kg

The USA dose UNIT of radiation = "Roentgen Equivalent Man" {rem} = 0.01 J/kg

The minimum fatal dose of radiation for a 200 lb man = 455 J of radiation

A) What is this minimum fatal dose in the SI system UNIT? ____________ Sv

B) What is this minimum fatal dose in the USA system UNIT? ___________ rem

The mine rescue operation in Chile, currently ongoing, divulges data thru the news media and TV that affords some simple physics calculation: Here's the data:

We're told the depth of the mine is 2040 ft.

The weight of the rescue capsule + average weight of (each) man = 1200 lbs.

Time capsule takes from mine floor to ground = 15 min. {assume constant speed}

Time capsule takes from ground to mine floor = 10 min. (assume constant speed}

The large pulley wheel {seen on TV at the top of the lift rig is divided into ten(10) equal angular segments (by spokes). The lift cable subtends approx 3.5 of these segments.

Questions:

1) What is the minimum horsepower(hp) reqd. of lift motor/engine to rescue a miner?

{1.0 hp = 550 ft-lb/s}

2) What is the minimum hp reqd. to lower capsule from ground to mine floor?

3) How many revolutions of the big pulley atop the rig to rescue a miner?

using UR experience with automobiles and people => A) what are the chances of INCREASED human injury due to low speed accidents caused by a lack of engine noise. Please rate this as a %age from 0 to 100.

also

B) What in UR opinion is the chance (0 to 100%) of, in the USA, a manditory back-up alarm being required for all totally electric vehicles - within 10 years of their first sale in this country.

Which of the following will correctly end the statement below.

The Coefficient of Restitution is a ratio of "before" to "after" collision...

A) Energy

B) Momentum

C) Acceleration

D) Mass

E) Bounce Height

F) None of the above

I would like to avoid the increasing price of common

bleach solution (sodium hypochlorite, 6% available chlorine by weight).

sold at grocery stores. Currently in my area the cheapest

generic is $ 1.50 gallon.

So I checked out the price of a crystalline substance

with formula: C3 H4 Cl2 N3 Na O5 that's used to chlorinate pools/spas,

and is 55% by weight, available chlorine. 14 oz (397 g) of this

chemical costs $ 9.00.

If I mix up chlorine sol'n from this chemical, that is

the equivalent strength of available chlorine to that

sold in grocery stores, do I lower the cost per gallon

below store bought?

A magician pulls a tablecloth from a table that has a 0.85 kg vase on it, half-filled with water. If he pulls in such a manner that the tablecloth is removed at the minimum speed necessary to keep the vase and its contents stationary - with what force must he pull? (answer to 1 decmal place)

additional info:

----------------------

vase capacity = 1.0 L

coefficient of kinetic friction between table and tablecloth = 0.3

coefficient of static friction between vase and tablecloth = 0.6

Work has dimensions = ML² / T²

and is interchangeabe with Energy,

which has the same dimensions.

Name one other quantity that has

these same dimensions. (a)

Explain why this quantity

is *not interchangeable* with

the first two. (b)

IF the acceleration-time graph was a curve and not a horizontal straight line IT would have slope/s. These slopes would represent the rate of change of acceleration, another graph could be drawn - is there a NAME for this function of motion?