1) An average human has a heart rate of 70 beats per minute. If someone\'s heart

Question

1)  An average human has a heart rate of 70 beats per minute. If someone's heart beats at that average rate over 70-year lifetime. How many times would it beat?

a) 7.4 x 10^5

b) 2.2 x 10^6

c) 1.8 x 10^7

d) 2.6 x 10^9

2) if F = 3a + 4 where F has a unit of kg.m/s^2 and a has a unit of m/s^2, then the numbers 3 and 4 have the units of?

a) kg,m/s

b) m,kg/m^2

c) s^2/m, kg.m/s^2

d) kg,kg.m/s

3) The wavelenght of a certain laser is 0.66 microns, where 1micro = 10-6m. What is the wavelength in nanometers? (1nm = 10^-9 m)

a) 6.6x10^1 nm

b) 6.6x10^2 nm

c) 6.6x10^3nm

d) 6.6x10^4 nm

4) 180 m/s^2_____________km/min^2 , where min represents minutes

a) 3.00 x 10^3 km/min^2

b) 10.8 km/min^2

c) 6.5x10^2 km/min^2

d) 6 x 10^2 km/min^2

e) 6.48 x10^2 km/min^2

Explanation / Answer

Find out how many minutes are in a year. 60 minutes/hr * 24 hr /day * 365.24 days/yr =5.3*105 70 * 70 * 5.3*105 =2.6 *109


b. units on both must watch for each and evevry factor on RHS

if LHS = N= kgm/s^2
3a = kgm/s^2 , if a = m/s^2   then 3 = kg

if 4 = kg m/s^2 (sams as that of RHS)

c. 1 micro m = 10^-6 m
1nm = 1 micro m * 10^-3

then 0.66 um = 0.66 *10^-6 * 10^-3 nm = b) 6.6x10^2 nm


d. 1km = 1000m ----> 1m = 0.001 kM
1 min = 60 s
1 min^2 = 3600 s^2

180 m/s^2 = 180* 0.001*3600 = e) 6.48 x10^2 km/min^2



Find out how many minutes are in a year. 60 minutes/hr * 24 hr /day * 365.24 days/yr =5.3*105 70 * 70 * 5.3*105 =2.6 *109


b. units on both must watch for each and evevry factor on RHS

if LHS = N= kgm/s^2
3a = kgm/s^2 , if a = m/s^2   then 3 = kg

if 4 = kg m/s^2 (sams as that of RHS)

c. 1 micro m = 10^-6 m
1nm = 1 micro m * 10^-3

then 0.66 um = 0.66 *10^-6 * 10^-3 nm = b) 6.6x10^2 nm


d. 1km = 1000m ----> 1m = 0.001 kM
1 min = 60 s
1 min^2 = 3600 s^2

180 m/s^2 = 180* 0.001*3600 = e) 6.48 x10^2 km/min^2



70 * 70 * 5.3*105 =2.6 *109


b. units on both must watch for each and evevry factor on RHS

if LHS = N= kgm/s^2
3a = kgm/s^2 , if a = m/s^2   then 3 = kg

if 4 = kg m/s^2 (sams as that of RHS)

c. 1 micro m = 10^-6 m
1nm = 1 micro m * 10^-3

then 0.66 um = 0.66 *10^-6 * 10^-3 nm = b) 6.6x10^2 nm


d. 1km = 1000m ----> 1m = 0.001 kM
1 min = 60 s
1 min^2 = 3600 s^2

180 m/s^2 = 180* 0.001*3600 = e) 6.48 x10^2 km/min^2

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