Skip to content

Course home

Sign up

7.1 Work done

EasyMediumHard
123456789101112131415161718192021222324252627282930
Question 30
H

A 3.0 kW kettle heats 1.5 kg of water from 20 ∘C20\ ^{\circ}\text{C}20 ∘C to 100 ∘C100\ ^{\circ}\text{C}100 ∘C.

The specific heat capacity of water is 4200 J/kg ∘C4200\ \text{J/kg}\ ^{\circ}\text{C}4200 J/kg ∘C.

Use the equation: change in thermal energy=mass×specific heat capacity×change in temperature\text{change in thermal energy} = \text{mass} \times \text{specific heat capacity} \times \text{change in temperature}change in thermal energy=mass×specific heat capacity×change in temperature

What is the minimum time taken to heat the water?

[1]
A

2.8 s2.8\ \text{s}2.8 s

B

168 s168\ \text{s}168 s

C

210 s210\ \text{s}210 s

D

168 000 s168\,000\ \text{s}168000 s

Markscheme

7.1 Work done Questions

  1. GCSE
  2. /Physics
  3. /7.1 Work done

44 exam-style questions on OCR GCSE Physics 7.1 Work done, covering 7.1.1 Conservation of energy in a closed system, 7.1.2 Energy stores and transfers, 7.1.3 Energy changes by heating, forces and current, 7.1.4 Quantifying energy transfers in a system, and 7.1.5 Kinetic, elastic and gravitational potential energy. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank