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Physics 101 Mechanics Q&A Archive of November 28, 2021

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November 28 of 2021

A ball is dropped from a roof to the ground 8.0 m below. A rock is thrown down from the roof 0.600 s later. If they both hit the ground at the same time, what was the initial speed of the rock?
A pirate was looking oh over the ocean from his ship admiring a solid brick of gold. The bar of gold slipped from his fingers and fell into the ocean. God has a way of 121.5 N experienced point force of 6.484N when completely submerged in salt water. What is its densit?y
Two waves that set up a standing wave in a long string are given by the wave functions y1 = A sin(kx -?t+?) and y2 = A sin(kx + ? t) Show (a) that the addition of the arbitrary phase constant ? changes only the position of the nodes and, in particular, (b) that the distance between nodes is…
3. A nozzle with radius of 0.230 cm is attached to a garden hose with a radius of 0.850 cm. The flow rate through hose and nozzle is 0.4 L/s. Calculate the speed of the water in the hose and in the nozzle
2. Right in the heart of China, the Macau Tower, Macau is the highest com- mercial bungee jump in the world with a maximum length of 233 m dur- ing stretch. When the bungee cord (rope) is un-stretch, its length is 180m. If a man weighing 500 N, dropped from the top of Macau tower,…
Assuming that the curve of KT versus J is a straight line over the working range, show that, for a given forward speed, the thrust (T) developed by a propeller varies with its rpm. (N) as follows. T = AN2 - BN Where A and B are constants for a given propeller and a given ground speed. For a…
Assuming that the curve of KT versus J is a straight line over the working range, show that, for a given forward speed, the thrust (T) developed by a propeller varies with its rpm. (N) as follows. T = AN2 - BN Where A and B are constants for a given propeller and a given ground speed. For a…
A pirate was looking oh over the ocean from his ship admiring a solid brick of gold. The bar of gold slipped from his fingers and fell into the ocean. God has a way of 121.5 N experienced point force of 6.484N when completely submerged in salt water. What is its densit?y
2. Right in the heart of China, the Macau Tower, Macau is the highest com- mercial bungee jump in the world with a maximum length of 233 m dur- ing stretch. When the bungee cord (rope) is un-stretch, its length is 180m. If a man weighing 500 N, dropped from the top of Macau tower,…
Assuming that the curve of KT versus J is a straight line over the working range, show that, for a given forward speed, the thrust (T) developed by a propeller varies with its rpm. (N) as follows. T = AN2 - BN Where A and B are constants for a given propeller and a given ground speed. For a…
Assuming that the curve of KT versus J is a straight line over the working range, show that, for a given forward speed, the thrust (T) developed by a propeller varies with its rpm. (N) as follows. T = AN2 - BN Where A and B are constants for a given propeller and a given ground speed. For a…