The blade of a hoe feel colder to touch in the morning than the wooden handle because the?

which of the below affect diffusion?

I. Mass II. Density III. Temperature IV. Nature of substance A. I and II only B. I, II and IV only C. II, III and IV only D. I, II, III and IV Correct Answer: Option B = I, II and IV only Explanation Rates of diffusion of a substance generally depend on density temp....
The blade of a hoe feel colder to touch in the morning than the wooden handle because the?

2kg of water is heated with a heating coil which draws 3.5A from a 200V mains for 2 minutes. What is the increase in temperature of the water? [specific heat capacity of water = 4200 jkg‾¹k‾¹]

A. 30° B. 25° C. 15° D. 10° Correct Answer: Option D = 10° Explanation Electricity heat energy supplies by the heater = lvt = 3.5 x 200 x (2 x 60) = 84000J and this heat is supplied to the 2 kg of the water MC ∆ t = 84000 2 x 4200 x ∆ t = 84000 ∴ ∆t = (84000)/8400 =...

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