MEASUREMENT REVIEW PROBLEMS show all work 1 C speed of light =300,000km /sec a.

Question

MEASUREMENT REVIEW PROBLEMS show all work 1 C speed of light =300,000km /sec a. =? Mi/sec b. =?mi/hr c. distance in km light travels in one yr (ly)=? 2 1.2 cm = a. = ? mm b. =? Km c. ?mum ? =Nm 3 Dimensional analysis are the following consistant (show work L,M, T etc) a. time=( 3 xa)^1/2 ? If not what physical property is this consistent with. b F= p/t p is momentum ? c. tau = pr/t tau is torque. 4 Use the web get the radius of Jupiter, get the mass of Jupiter Calculate the density of Jupiter. 5 Given Staten Island about 12 miles long and 6 miles wide. On the average every square yd of Staten Island has 1100 carpenter ants, estimate the number of carpenter ants on Staten Island.

Explanation / Answer

1) a) 1 mile = 1.609 km so c= 3*10^5 /1.609 Mi/sec = 1.864*10^5Mi/sec

b) 1 hr=3600 when the aboe result is diided by 3600 sec we get the value in hour so 1.864*10^5/3600 Mi/Hr =51.79Mi/hr c) distance travelled in one year = 1 year =365 days = 365*86400 sec

s0 d=velocity *time = 3*10^5 *365*86400 =9.4608*10^12 this is called as light year

2) a=12 mm b) 12*10^-6 km c) 12000 micro meter d) 12*10^6 nm (nano meter)

3)a it can be consistent with length

b) p is momentum p =ML/T so F=MLT^-2 is satisfied

c) tau is torque as tau=ML^2T^-2   and pr/t =ML^2T^-2 is true

4) mass =1.8986

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