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What is the weight on earth of a girl with a mass of 30 kg the acceleration due to gravity on earth is 9.8ms?
Wiki User
∙ 9y ago
30 kilogram mass ==> 294 newtons (66.1 pounds) on earth
30 kilogram mass ==> 48 newtons (10.8 pounds) on the moon
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoSimply multiply mass x acceleration: 30 x 9.8 = 294 newtons or about 66lbs
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If the speed of an object changes from 121ms to 98ms during a time interval of 12 s what is the acceleration of the object?
We have this equation: Velocity after = Initial velocity + (acceleration * time) So, let's plug in the numbers into this equation. 98m/s = 121m/s + (acceleration * 12seconds) So, -23 = 12 seconds * acceleration dividing 12 from both sides, the acc. is -1.92m/s/s. (Yes, those are the UNITs of acceleration. And it's negative because the object slows down. )
How long does i t take a stone falling from a bridge with an average downward acceleration of 98ms² to hit the water if the stone starts from rest and hits the water with a velocity of 123ms?
If you split up this situation into events, it makes it a lot easier. the first event is the stone at rest, and the second is the stone hitting the water below. you can then make a chart like this, its really nifty. We'll have the top of the bridge be 0m and the water be some positive number (so down is positive). Event 1 Event 2 t1=0s t2=?? x1=0m x2=?? v1=0m/s v2=123m/s a=9.8m/s2 From here you can use the velocity equation, which is: v2=v1+a(t2-t1) 123=0+9.8(t2-0) 123=9.8t2 1.55=t2 If you wanted to find how high the bridge was, you would use the position equation: x2=x1+v1(t2-t1)+1/2a(t2-t1)2 I won't do the work out, but there you have it!
