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Results tagged with homework-and-exercises
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user 83970
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
1
vote
Accepted
Minimum time taken by train to reach its station
Tell me if I get something wrong...
You are going to accelerate in the first part of the track (with constant acceleration, let's say, $a_1$) and then you are going to decelerate in the second part of …
- 153
0
votes
What is the derivative of $\dot{\theta^2}$?
${d \over dt} \theta = \dot \theta$
So what you are asking is basically
${d^2 \over dt^2} \theta^2$
First, ${d \over dt} \theta^2 = \dot{\theta^2} = 2 \theta \dot \theta$
Second, ${d \over dt}(\dot …
- 153
0
votes
Accepted
Exercise about equilibrium and virtual work
a) You're correct. Since the two carriages AND the spring can only move in one dimention, the system has only one degree of freedom. But wait. They are not moving in a plane! (that is a two domention …
- 153
0
votes
Accepted
Given a Force $F$ in newtons, what are the appropriate units for a scalar $Q$ so that $F = Q...
Well, not the way you posted it but, a Force is a vector quantity.
So $10 * \vec 20.0 N$ is a valid "scalar - vector multiplication". So it's totally valid for $Q = 10$, as a scalar, dimentionless.
- 153