Thursday
May 23, 2013

# Posts by steven

Total # Posts: 305

calculus
a) -2(x/r) b) Negative c) 2(4.29 / 6400) * 100

physics
Can you figure it out now?

physics
Velocity is a vector quantity, meaning it has both magnitude and direction. Acceleration is the rate of the change of velocity. Therefore, if the speed changes, the object is accelerating (whether it speeds up or slows down). ALSO- if the object is changing direction, the obje...

Physics
For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target must the barrel of t...

physics
Kinematics Equations: Vx1 = Vx0 + axΔt (Vx1)^2 = (Vx0)^2 + 2axΔx Δx = Vx0Δt + ½ ax(Δt^2) Using the second kinematics equation, we can solve for Δx. (Vx1)^2 = (Vx0)^2 + 2axΔx Plug in what you know: (45 m/s)^2 = (0 m/s) + 2(9.8m/s^2)(? m...

science physics
The speed at which the two objects are approaching each other (from the trains' perspective) is 95 km/h (x 2) = 190 km/h. If they are 7.5 km apart at first, you can set up a proportion: 190 km 7.5 km ------ = --------- 1 hr x hr Cross-multiply the terms and set them equal ...

Physics
For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target must the barrel of t...

Physics
I would like to forget the upward component, as the object IS in fact a bullet fired at a fast velocity from a gun towards a target not too far away. However, we're graded on the correctness of our problem solving. And, additionally, this factor WOULD become an issue if we...

Physics
That's not entirely correct... That would only be true if the rifle was fired horizontally, giving the x component 460 m/s towards the target. However, that 460 m/s has some UPWARD y component too, reducing the x component by some amount... Thanks, Steven

Physics
For this problem, ignore air resistance. You are to fire a rifle that shoots a particular bullet at 460 m/s at a target that is 45.7 m away and level with the rifle. Assuming that the acceleration due to gravity is 9.80 m/s², how high above the target must the barrel of t...

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