1) (a) How many seconds are there in 24.0 year(s)? s (b) How many nanoseconds ar

Question

1) (a) How many seconds are there in 24.0 year(s)?
s
(b) How many nanoseconds are there in 24.0 year(s)?
ns
(c) How many years are there in 24.0 second(s)?
yrs

2)A car slows down uniformly from a speed of 22.0 m/s to rest in 4.00 s. How far did it travel in that time?
m

3)A car traveling at 85 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.86 m. What was the average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1.00g = 9.80 m/s2
g

4)A stone is dropped from the top of a cliff. It hits the ground below after 4.00 s. How high is the cliff?
m

Explanation / Answer

1) 24 years = 24 * 365*24*3600 = 756864000 seconds

24 years = 756864000 * 10^9 nano seconds

24 seconds = 24/365*24*3600 = 7.6*10^-7 years

2) verage velocity = 11 m/s distance travelled is 11*4 = 44 m

3) v^2-u^2 = 2as

a = u^2/2s = (85*0.2777)^2/2*0.86 = 33 g ( here 1 km/hr = 0.2777 m/s)

4) t = sqrt(2h/g)

h = gt^2/2 = 9.8*8 = 78.4 m

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