Recent content by warrior2014

Homework Statement The armature of an ac generator is a circular coil with 49 turns and radius 3.1 cm. When the armature rotates at 382rpm, the amplitude of the emf in the coil is 17.0 V. What is the strength of the magnetic field (assumed to be uniform) ? Homework Equations E = N.n.phi...

Homework Statement The motor that drives a reversible refrigerator produced 142 W of useful power. The hot and cold temperatures of the heat reservoirs are 20°C and -6.1°C. What is the maximum amount of ice that can produce in 2.2 hours from water that is initially at 6.0°C? Homework...

I get it! thanks for your help :)

Homework Statement A certain engine can propel a 1600 kg car from rest to a speed of 22 m/s in 9.7 s with an efficiency of 23%. what is the rate of heat flow into the engine at the high temperature? what is the rate of heat flow out of the engine at the low temperature? Homework...

Homework Statement At 0 degrees, and 1 atm, 0.6 mol of a gas occupies a volume of 0.0134 m^3. what is the mass density? The number density is 2.69x10^25 m-3, the average distance between the gas molecule is 4nm and the total mass is 17.685g. Homework Equations n=N/Na 1u=1.66x10^-27...

Oh okay I get it. thank-you for all of your help :)!

no kitchen experience at all! but if the pressure inside the container is higher than the outside, wouldn't the lid pop off? I still don't get how this will help me get the question...

so if you undid the restraints then the pressure inside would decrease? I'm still confused on how to solve the problem.

Pressure of a lid! Homework Statement A lid is put on a box that is 10cm long, 20cm wide and 8cm tall and the box is then evacuated until its inner pressure is 72000 Pa. 1.How much force is required to lift the lid at sea level? 2. How much force is required to lift the lid in Denver...

well the work done is going to be the same and since I knew that, I put the value in and it was correct

I figured out how to get (a), (b), (c) and (e) but unsure how to get (d). Could you please help me with that one?

Torque, Angular Displacement, Work! Homework Statement The radius of a wheel is 0.525m. A rope is wound around the outer rim of the wheel. The rope is pulled with a force of magnitude 5.45 N, unwinding the rope and making the wheel spin counterclockwise about its central axis. Ignore the mass...

oh okay. thank you! now I understand.

lose?

if the height at the bottom is 0, then wouldn't the PE at the bottom also be 0? so then PE would be 1372J? I'm kind of confused.