Recent content by dismalice

Homework Statement A 19-cm-long nichrome wire is connected across the terminals of a 1.8 V battery. If the current in the wire is 2.1 A, what is the wire's diameter in mm? Homework Equations R = Rho*L -------- A v=ir The Attempt at a Solution rho for this = 100...

I found data in the book that states RUnning at 15km/hr takes 1150W of Metabolic Power. I converted 1150W/H to equate to 19.167 W/minute then multiplied this answer times 12 mins and was unable to find the answer. Any ideas?

Yes, I am 100% sure, I have even tried spelling out Celsius and it refuses to take the response.

Can anyone else assist me with this problem?

Can anyone else assist me with this problem?

This is all the information that is given.

Mastering Physics is not taking that answer as correct. Is there another way of looking at this problem?

Homework Statement How much metabolic energy is required for a 68 kg person to run at a speed of 15 km/h for 12 mins in kJ? Part B How much metabolic energy is required for this person to walk at a speed of 5.0 km/hr for 36 mins in kJ? Homework Equations E=W (+Q) W= FD e=1/2 mv^2...

I do not follow, can you please explain to me what you mean?

Homework Statement An ideal gas is at 20C. The gas is cooled, reducing the thermal energy by 35%, What is the new temperature in C? Homework Equations None in particular. The Attempt at a Solution 35% of 20C is 7, 20-7= 13C

Could you please give me an example, I am not quite clear on what you are saying.

Homework Statement A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 35 cm diameter stone is spinning at 200 rpm and has a mass of 15 kg. The coefficient of kinetic friction between the knife and the stone is 0.20. If the stone loses 10% of its speed in 10 s of...

Homework Statement A computer disk is 8.0 cm in diameter. A reference dot on the edge of the disk is initially located at The disk accelerates steadily for 0.50 s, reaching 2000 rpm, then coasts at steady angular velocity for another 0.50 s. I have found that a_t=17 m/s^2 @ .25s a_c =...