Recent content by kajalove

Ball would start moving in a horizontal direction. I realize that and I know this is not the case, but why doesn't it happen?!

hi I know about harmonic oscilation, but I'm having trouble understanding how we derived formulas for gravity pendulum. Please read on. If a ball on a string ( string is attached to the ceiling ) is displaced from its equilibrium position by angle A1, then forces on this ball are...

I know very little about derivatives but couldn't we find instantaneus power at specific time T by finding derivative of a function work(T)? But if v is constant then no work is being performed and so by definition formula \frac{A}{t } = F\frac{s}{t} shouldn't be valid! I don't think...

hello 1.Power is defined as W / t. But problem is that the work done by the force increases with displacement, since body travels same distance in ever shorter time periods. So how can we find instantaneus power if the more time it passes by more work does force do in same time interval ...

I would think applied forces (due to Newton's third law) would be equal while torque would depend on my axis of rotation. could you explain it in a bit more detail since I haven't got a clue?

Now I know better how torques negate each other when it comes to screwdrivers and similar . But the following I still don't understand:

that's easy.Both clockwise and counterclockwise torques would have to be equal in order to balance each other out T = F * d = 50N * 0.5m = 25 N m F = T / d = 25 N I would have to push with force 25 N.

I'm sorry mate but I still don't get it. I would really need some thorough explanation

Torques really can get confusing Why would torques be the same ?Is there some proof you can show me (mathematical or vector)? And why would force be greater? I do know that when lever arm is smaller there needs to be greater force for same torque, but if you only applied force 10 N where...

It'd be best if I start with example. Screwdriver helps us by having a handle with a large radius that provides a mechanical advantage in turning a blade with a smaller radius. So whatever force exerted on screwdriver's handle by hand, same force is exerted on screw. But torque on a handle is...

Off topic but I feel it's an important subject: I'm not shure I understand why h is negative and you still get the same correct result. Is it because you also made acceleration vector g negative( v = v_0 + a t = v_0 -g t )? I know it's off topic, but when you decide to give some variables...

That I know But how do we derive formula for net velocity v = sqrt( v[0]^2 + 2*g*h ) when object is thrown from certain height under certain angle(that angle being above or below horizon)?In other words,when besides initial horizontal speed there is also initial vertical speed? Can you...

Yes,I meant final speed. I didn't see the need to use vector equations when object is thrown horizontally,final net velocity is vector object has moment before object hits the ground,and this vector is tangent to the path of object. When I'm talking about object being thrown...

I'm sorry but your reply was way too scarce to help me with any of my questions

hey I'm currently learning about velocities of objects thrown horizontally.The main point is that initial horizontal speed v[0] will remain constant while vertical velocity will accelerate with a = 10m / s^2. But when learning formulas there are few things that got me confused: 1)We can...