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Two balls of identical size and shape are dropped from the same height. One ball has a mass of 50kg and the other has a mass of only 10kg. Why do they reach the ground at the same time?

The only forces acting on the balls are gravity (pulling down) and air resistance (pushing up). Since the balls are the same shape and size, the air resistance will be the same on both. Likewise, the gravita...
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Answered by Gregor P. • Physics tutor
17571 Views

How do you know when to use the imperfect tense and when to use the perfect tense?

Simply, the imperfect tense is used to convey an action in the past that was taking place over a period of time e.g. 'Je regardais la télé' = 'I was watching TV' - the act of watching TV was not instantaneou...
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Answered by George E. • French tutor
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Solve for X and Y: 2y + x = 7; 3y - x = 8

x=1, y=3; Firstly, rearranging for x in the first equation: x = (7-2y); Substitute this into the second equation: 3y - (7 -2y) = 8; Expand: 3y -7 +2y = 8 (watch negative) 3y +2y = 15 Therefore, 5y = 15 and y...
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Answered by Ruth K. • Maths tutor
5762 Views

Sodium and sodium iodide can both conduct electricity when molten, but only sodium can conduct electricity when solid. Explain this difference in conductivity in terms of the structures of sodium and sodium iodide.

When approaching a question like this, it’s important to identify the two compounds that we are dealing with first. Sodium is an alkali metal, and therefore the metallic structure that it forms comes from me...
KB
Answered by Karol B. • Chemistry tutor
61811 Views

Outline the Euthyphro's dilemma

In the Platonic dialogue Euthyphro, Socrates asks the greek prophet Euthyphro the question: "is the pious pious because it is loved by the gods or is it loved by the gods because it is pious?", tha...
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Answered by Silvia V. • Philosophy tutor
6729 Views