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Why is potential energy negative? What does that even mean?

This is really just a definition! When we ask what the potential energy of an object is, we are really asking what energy is available to be extracted. In the case of gravity: two objects separated by an inf...
BT
Answered by Ben T. • Physics tutor
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How do conjunctions like 'weil' and 'obwohl' affect the word order?

Words such as 'weil' and 'obwohl' are known as 'subordinating conjunctions' - these types of conjunctions affect the word order in German. They introduce a clause which cannot stand on its own, but is depend...
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Answered by John K. • German tutor
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I'm struggling with an FP2 First-Order Differential Equations Question (Edexcel June 2009 Q3) and the topic in general!

(In terms of formatting, we'll use y' to represent dy/dx, exp() to represent the expoential e^(), int() to represent integration with respect to x, and 1ODE to mean First-Order Ordinary Differential Equation...
LB
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Describe the differences between the primary and secondary immune responses in terms of B cells and antibody production. Include in your answer a definition of an antibody.

Antibodies are produced by B cells, mostly by plasma cells, in response to signals from other cells of the immune system. They are also known as immunoglobulins and have a Y shaped structure. When the immune...
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Answered by Hannah B. • Biology tutor
12574 Views

Katie, Jackie and Charlie bake cookies. Katie has baked 8 more cookies than Charlie. Jackie has baked 5 more cookies than Katie. Altogether they have baked 72 cookies. How many cookies did Jackie bake?

K = C + 8 → C = K - 8 J = K + 5 J + K + C = 72 (K + 5) + K + (K - 8) = 72 3K - 3 = 72 3K = 75 K = 25 J = 25 + 5 = 30 C = 25 - 8 = 17
IJ
Answered by Ina J. • Maths tutor
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