Determining final velocity using initial velocity and displacements in a ramp question.
A 5 kg bowling ball is rolled back to the bowler over a ramp system. If the ball is given an initial velocity of 0.6 m/s at its starting point's height which is 100 cm, what is the balls velocity at its ending point at 40 cm, after going over a height of 45cm first? So the ball leaves the first position goes through a dip up to ...continues
Understanding planetary characteristics. Graphics attached in gif format.
What is the planet closest to the sun that you can see to the west right after the sun sets?
Water is 2 0m above an outlet pipe. The velocity is 16.1 ms-1, what is the efficiency?
Finding the minimum power required in an electricity generating station.
An electricity generating station has a rated output of 300 megawatts. Given that the station heat rate is 12 000kJ/kW-h, and the coal used has a heat value of 23 000kJ/kg, find the minimum possible belt-drive power required for the bunker coal conveyor in order to keep the boiler supplied when the station is on full load. The ...continues
Kinetic theory : The mean free path of molecules.
In an experiment, the viscosity of the gas was found to be 2.25 x 10^-4 CGS units. The RMS velocity of the molecules is 4.5 x 10^4 cm/s. The density of the gas is 1 gm per liter. Calculate the mean free path of the molecules.
At an accident scene on a level road, investigators measure a car's skid mark to be 88m long. It was a rainy day and the coefficient of friction was estimated to be 0.42. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. (Why does the car's mass not matter?)
Two railroad cars, each of mass 6500kg and traveling 95 km/h collide head-on and come to rest. How much thermal energy is produced in this collision?
A vertical spring (ignore its mass), whose spring constant is 900 N/m, is attached to a table and is compressed 0.150m. What speed can it give to a .300-kg ball wehn released? How high above its original position (spring compression) will the ball fly?
Gravitational potential energy
A baseball is thrown from the roof of a 120 ft tall building with an initial velocity of magnitude 60 ft/s and at an angle of 37 degrees above the horizon. 1. what is the speed of the ball just before it strikes the ground using energy methods? 2. What would be the answer to the first part if the initial velocity was at ...continues
Biological Evolution contradicted by the 2nd Law of Thermodynamics?
Some people claim that biological evolution violates the second law of thermodynamics, since evolution involves simple life forms developing into more complex, more highly ordered organisms. Why is this argument wrong? I'm pretty sure that the answer lies in the definition of entropy. Doesn't entropy limit itself to energ ...continues
