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What is the difference between A.C. and D.C.?

A.C. stands for alternating current, and the current constantly changes direction. D.C. stands for direct current, and the current only flows in one direction.
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Answered by Sophie S. • Physics tutor
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What is the momentum of a 84 kg man running at 5 m/s?

Use the equation p= m x v , where p=momentum m=mass (kg) and v=velocity (m/s)p= 84x5 = 420 kg m/s
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Answered by Sophie S. • Physics tutor
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What is the mass (in grams) of 0.1 moles of CaCO3?

Use the equation mass(g) = moles x MrThe moles are given in the question, moles= 0.1 molLook at a periodic table to work out the Mr of CaCO3: Ca= 40 C= 12 O= 16 Therefore Mr= 40+12+(16x3) = 100So mass (g)= 0...
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Answered by Sophie S. • Chemistry tutor
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Why can graphite conduct electricity but diamond can not?

In diamond the carbon atoms are bonded to four other atoms. Whereas, in graphite each carbon atom is only bonded to three other atoms. Therefore, there are delocalised (free) electrons in graphite, which can...
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Answered by Sophie S. • Chemistry tutor
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Describe the reflex arc.

A stimulus (for example a pin) stimulates the receptor which causes a nerve impulse in the sensory neuron. The impulse travels to a synapse in the spinal cord, where chemicals diffuse across the gap in the s...
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Answered by Sophie S. • Biology tutor
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