Calculate the energy needed to heat kg of water from °C to °C, in kJ. ( J kg⁻¹ K⁻¹)
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2730 questions · page 26 of 137 · choose a topic above to narrow them down
Calculate the energy needed to melt kg of ice at °C, in kJ. ( J kg⁻¹)
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Specific latent heat of vaporisation is defined as the energy required to
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A wave has frequency Hz and wavelength m. Calculate its speed.
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The amplitude of a wave is doubled. State the factor by which its intensity increases.
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A Hz siren moves towards a stationary observer at m s⁻¹. The speed of sound is m s⁻¹. Calculate the observed frequency.
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The same Hz siren moves away from the observer at m s⁻¹. Calculate the observed frequency. ( m s⁻¹)
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A source of sound moves towards a stationary observer. Compared with the source frequency, the observed frequency is
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In front of a moving sound source, compared with a stationary source, the wavelength is
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Calculate the wavelength of microwaves of frequency Hz.
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An electromagnetic wave has a wavelength of about m. It is most likely
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Calculate the frequency of light of wavelength nm, in units of Hz.
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Which type of wave can be polarised?
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Plane-polarised light passes through an analyser whose axis is at to the plane of polarisation. Calculate the fraction of the intensity transmitted.
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A N force at above the horizontal pulls a sledge m along level ground. Calculate the work done by the force.
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A motor takes W of electrical power and produces W of useful mechanical power. Calculate its efficiency.
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The work done by a varying force is equal to
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Calculate the kinetic energy of a kg car moving at m s⁻¹, in kJ.
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Calculate the gain in GPE when a kg mass is raised by m. ( m s⁻²)
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The speed of an object is doubled. State the factor by which its kinetic energy increases.
Salam Academy Original Practice · Proposed mark scheme