Classical Mechanics Answers

A ball is made of a long string of thickness about 2 mm. The radius of the ball is 10 cm. Estimate the length of the string. Point out the possible errors in your calculation.

Which will fall fast on ground. If the mass 9f feather is equal to the msss of stone

On a beautiful day you decide to go fishing with your younger brother Ben. Ben has not been fishing before so he doesn't know how to properly cast out his line. He puts the lure 12.6 cm above the water before letting it drop straight down. The line accelerates until it hits the water then continues to the bottom of the lake at a constant speed. It takes the lure 7.50 s to reach the bottom of the lake from when it was released by Ben.

How deep is the lake? (Assume the lure accelerates at the free fall rate of 9.8 m/s2 until it hits the water.)

if velocity is related to displacement as v=x^2.find the acceleration in terms of displacement.

On a beautiful day you decide to go fishing with your younger brother Ben. Ben has not been fishing before so he doesn't know how to properly cast out his line. He puts the lure 25.2 cm above the water before letting it drop straight down. The line accelerates until it hits the water then continues to the bottom of the lake at a constant speed. It takes the lure 6.50 s to reach the bottom of the lake from when it was released by Ben.

How deep is the lake? (Assume the lure accelerates at the free fall rate of 9.8 m/s2 until it hits the water.)


What must have been his initial speed coming off the trampoline?

You are thinking about taking gymnastics, so you go to the facility and get an idea of what to expect by looking out from the viewing room. The viewing room window is 3.50 m above the trampoline directly below, so it is perfect for viewing the the facility. Occasionally someone jumps past the window and then back down. On one occurrence a gymnast went up past the window and came back down; as he passed the window on the way down, you notice that his speed is 12.6 m/s.

What must have been his initial speed coming off the trampoline?

Having some trouble with class 2 levers... We are working on a simple machines curriculum for elementary school use, and a colleague believes that a springboard is a class 2 lever. I think that it is not (at least, not -just-) because the board bends under downward effort applied to it, and then the flexing force of the board material is where the upward effort comes from... do levers, in their most basic sense, need to be rigid? Can you help clear this up for me?

If an airplane accelerated down a runway at 3.2 m/s squared for 32.8 seconds until it lifts of the ground what is the distance before takeoff?

A body of mass (m) falls from rest through a medium which exact a frictional drag force (bv) proportional to a applied force (f).1. Find it's velocity in terms of time t 2. Find it's terminal velocity

Flying into swimming pool; Why do you feel lighter while gravity is still pulling you down