Machines

The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58kg mass a height of 3.0m? A person lifts a 950 N box by pushing it up an incline. If the person exerts a force of 350 N ...continues

Machines

1. A 0.100 kg meterstick is supported at its 40.0 cm mark by a string attached to the ceiling. A 0.700 kg mass hangs vertically from the 5.00 cm mark. A mass is attached somewhere on the meterstick to keep it horizontal and in both rotational and translational equilibrium. If the force applied by the string attaching the meterst ...continues

interrupted pendulum

My professor was trying to explain the concept of the interrupted pendulum. I do not understand why most pendulums have the same period and why, when you interrupt a pendulum it will still reach the same height.

Lead tests

Hello can you please tell me how i can test lead levels in water to give a quantative result not just whether lead is preasent or not. can you also tell me where to get lead testing equiptment, note we have a colormeter at college i need a equiptment list and a list of chemicals and a method thanks emma

Unable to work out Newtonian force

my question is What force would be required to decelerate a 3800 kg vehicle uniformly from 60mph to zero in 2 seconds

Heat

A pan of water is heated from 23 C to 78 C. What is the change in its temperature on the kelvin and fahrenheit scales? A 0.225 kg sample of tin initially at 97.5 C is dropped into 0.115 kg of water initially at 10.0 C. If the specific heat capacity of tin is 230 J/kg *C (its a dot before "C" but im not exactly sure how t ...continues

heat 1

The air temperature above coastal areas is profoundly influenced by the large specific heat capacity of water. How large of a volume of air can be cooled by 1.0 C if energy is transferred as heat from the air to the water, thus increasing the temperature of 1.0 kg of water by 1.0 C? The specific heat capacity of air is appro ...continues

The Physics of the Splash

I was wondering what types of Physics were involved in a Splash. For instance, When you drop a rock into a pool, I noticed that the splash is always as high as the dropping point. IN general I was just wondering what types of physics were involved in a splash. Thank you.

Thermal physics

Please see the attached file for full problem description.

Thermal physics

Please see the attached file for full problem description.