Question 1: Measurements and Units
The quantity force × timemass has the same SI units as which of the following?

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Choose one answer for each question. You will see straight away whether you are right, with a short worked solution. Treat it like exam day: no notes, and a calculator only if your exam allows one.
The quantity force × timemass has the same SI units as which of the following?
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A 2.0 kg trolley moving at 3.0 m/s collides with a stationary 1.0 kg trolley and the two stick together. How much kinetic energy is lost in the collision?
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Light travels inside a glass block of refractive index 1.5 towards the glass–air boundary. Approximately what is the critical angle?
How much energy is needed to heat 0.50 kg of water from 20 °C to 80 °C? (specific heat capacity of water = 4200 J kg−1 K−1)
Resistors of 6.0 Ω and 12 Ω are connected in parallel to a 12 V battery of negligible internal resistance. What is the current from the battery?
A straight wire of length 0.50 m carries a current of 4.0 A at right angles to a uniform magnetic field of 0.20 T. What is the magnitude of the force on the wire?
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All questions are original practice questions written by Christos Fotakidis following the published Humanitas syllabus. They are not official Humanitas questions, they are not taken from any past paper, and this page is not affiliated with Humanitas University.