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A certain anchor is being made by pouring concrete into a cylindrical mold whose radius is 46 cm. How thick should the concrete be in order that the anchor has a mass of 1,200 kg?
Eating banana enable a person to perform about 40,000 J of work. Assuming 25 % efficient of the human body to process the energy content of the banana, to what height does eating a banana enable a 60 kg person to climb?
How much work is done in lifting 100 kg of bricks to a height of 30 m?
A person pulls a 200 kg load 50 m across a level floor using a rope that is 35 degree above the horizontal. The person exerts a force of 150 N on the rope, how much work is done by the person?
work done to cause no change in the volume of the system is?
cite 5 examples of motion in 2 to 3 dimensions. illustrate your 5 examples to position displacement and acceleration in vector notation
You have two balls of identical mass and size that behave very differently. When you drop the so-called “sad” ball, it thuds on the floor and does not bounce at all. When you drop the so-called “happy” ball from the same height, it bounces back to almost the same height from which it was dropped. The difference in the bouncing ability of the happy ball is due its internal structure; it is made of different material. You hang each ball from a string of identical length and place a wood board on its end directly below the support for each string(shown below). You pull each ball back to an equal height and release the balls one at a time. When each ball hits the board, which has the best chance of knocking the board over: the sad ball or the happy ball?
Consider the statement: If an object is moving, then its change in momentum is non-zero. (a) Is this statement valid? __________ (b) If you contend the statement is valid, how do you know? (c) If you contend the statement is invalid, what is wrong with it? (d) If the statement is invalid, restate it to give a valid statement.
Suppose that we have a collision between two carts on an air track and the carts stick together. One cart has a mass of 3M and is initially stationary. The second cart has a mass M and is moving with a momentum p⃗0 in the positive x-direction before the collision. a Which cart exerts the bigger force on the other? Explain (diagrams, expressions, etc will help here). b Which cart has the bigger change in momentum? Explain (diagrams, expressions, etc will help here). c What is the momentum of the second cart after the collision? Express in terms of p0.
