1mi is equivalent to 1609 m so 55 mph is: a) 15 m/s, b) 25 m/s, c) 66 m/s, 88 m/

Question

1mi is equivalent to 1609 m so 55 mph is: a) 15 m/s, b) 25 m/s, c) 66 m/s, 88 m/s, e) 1500 m/s. A laboratory class at Southem University is about 110 mts. It is equivalent o: a) 0.02 century, b) 0.002 century, c) 0.0002 centuiry, d) o.0o0002 century, e) none of these sphere of radius 6.37 X 109 m and mass 5.98 X 1024 kg. What is its ensity. 3 e driver of a car moving at 72 km/hr drops a road map on the floor. It kes him 3 seconds to locate and pick up the map. The car traveled ring this time: a) 10 m, b) 20m, c) 30m, d) 50m, e) 60 m

Explanation / Answer

1.

1 mile = 1609 m

1 hr = 3600 sec

So,

55 mile/hr = (55 mile/hr)*(1609 m/1 mile)*(1 hr/3600 sec)

55 mile/hr = 24.58 m/sec = 25 m/sec

2.

mts = meters, is unit of distance

century is a unit of time. 1 century = 100 years

Correct option is E. None of these

3.

density = Mass/Volume = 5.98*10^24/((4/3)*pi*(6.37*10^6)^3)

density = 5523.24 kg/m^3

4.

72 km/hr = (72 km/hr)*(1 hr/3600 sec)*(1000 m/1 km)

72 km/hr = 72*1000/3600 = 20 m/sec

Distance = speed*time

Distance = (20 m/sec)*(3 sec) = 60 m

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