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Results tagged with homework-and-exercises
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user 26834
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
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Freshman year forces problem
There is enough information.
Think about the tension in the rope on either side of the pulley - it's the same. Then look at the vertical forces.
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0
votes
Moment of inertia of rods
The moment of inertia is defined relative to the point of rotation, which in this case is the centre of the equilateral triangle. Then you can multiply this result by 3.
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1
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Applying the Symmetry of DC Circuits
The symmetry is that the lamps in the top half are the same as the lamps in the bottom half, albeit with a left/right switch. When S2 is closed, it is clear that the left/right placing makes no diffe …
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0
votes
Error due to Ammeter
Hint: the error is the difference between the two measurements, which is 0.028A.
Dividing 2.4 by 100 is irrelevant.
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1
vote
What is the difference between these two springs?
The answer is the opposite of what you would have if the springs were resistors.
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1
vote
Motion of a pendulum described by 2 equations
Equation 1 is wrong. As you say they can't both be right.
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1
vote
Accepted
Confused about Impulse
Alternatively, and qualitatively, think about the components of velocity (in the x y directions) have changed. Along the x axis, velocity has reduced, so the re has been a force in the -x direction …
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1
vote
According to calculations why the current of a battery of a mobile is high?
The unit Wh, shown on the battery, is Watt hours, which is the total energy (Joules), not the power.
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1
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Rotation of a system of two masses
Since the disk is pivoting around a point on its circumference (not its centre) you need to use the moment of inertia of the disk about that point, and it's not $1/2MR^2$.
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9
votes
Question about spinning Earth
What you are missing is the fact that the atmosphere moves along with the rotating earth (plus or minus local wind). You can see this because otherwise just standing still would subject you to enormo …
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0
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Solving for Normal Force
The trick here is to resolve Fgrav into its components in the direction of the slope and the direction of the normal to the slope (which by definition is at right angles to the slope).
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0
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Calculating velocity change after impact?
If the masses are the same, then as stated above, the initially moving mass stops and the other one acquires the velocity of the initially moving one. This is the mechaism behind the so called "Newto …
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19
votes
How many minutes in a year?
4 minutes a day accumulates to 24.3 hours in a year - ie the time it takes for the earth to rotate once, more or less. This in essence is why the difference between the sidereal day and the solar day …
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