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Can someone help me: determine the speed (velocity)? |
a car is traveling at 100 km/hr. how many hours will it take to cover a distance of 750 km? a plane traveled at for about 2.5 hours at a velocity of 1200 km/hr. what distance did it travel? a girl is pedaling her bicycle at a velocity of 0.10 km/min. how far will she travel in two hours? an ant carries food at a speed of 1 cm/s. how long will it take the ant to carry a cookie crumb from the kitchen tabke to the ant hill, a distance of 50 m? express in seconds, minutes, and hours. the water in the buffalo river flows at an average speed of 5 km/hr. if you and a friend decide to canoe down the river a distance of 16 kilometers, how many hours and minutes will it take? Lazy! Lazy! Lazy! All of these questions are the same - and none of them are asking you to determine the velocity. For example's sake (in case you genuinely don't know how to do this), let's go through the second one. The girl travels at 0.10 km per minute. Multiply by 60 (minutes per hour) to get her speed per hour. Multiply by 2 to find out how many kms she will travel in 2 hours. All of the other questions work on the same principle. speed=distance/time time=distance/speed time=750/100 = 7.5 hrs ----- distance=time*speed distance=2.5*1200 = 3000km --- distance=time*speed distance=2*.10=0.2 km ---- in seconds time=distance/speed * u have to make the meteres cintemeteres 50*100=5000cm time=5000/1 = 5000 seconds in minutes 5000/60=83.3 minutes in hours 5000/60*60=1.3 hours --------------- time=distance/speed time=16/5 = 3.2 hours in minutes --3.2*60=192 minutes Distance(D)=Rate(R)*Time(T) Rate=Distance(D)/Time(T) Speed=Distance(D)/T(T) 1. T=D/R T=750/100 T=7 hours and thirty minutes 2. D=R*T D=1200*2.5 D= 3,000 kilometers 3.D=R*T D=.10*2(120) D=.10*120 D=12 km 4 T=D/R T=50m(5000 cm)/1 cm T=5000/1 T=5,000 T=5,000/60=83 minutes 33 seconds T= 83:33-60:00=1 hour 23 minutes 33 seconds 5. T=D/R T=16/5 T=3.20= 3 hours 20 minutes |
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