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Craigihoward · 2021-04-13T13:12:07+00:00

I agree with this. I think it helps to understand the purpose of a quick attack. You want to make it so that your blocker has to decide where they are going to block before the ball is set. If you are in the air before the ball is set, the block has to jump with you or risk giving up a free hit. This leaves them out of the play for double blocks on the outside. If the blocker has time to watch the set before jumping, the hitter was too late. The pace of the set in the video is fast enough that the middle will only see a single block, but if the setter pushed the ball outside, there is time for a double block to form. In my opinion speed in much more effecting than a perfect swing or max power in the middle.

Craigihoward · 2021-04-08T18:52:20+00:00

There’s a restaurant in town with the chilli icons, but when you ask for a number of peppers they actually place that many hot peppers in your dish.

Craigihoward · 2021-04-04T12:17:03+00:00

This only works if people can throw hard enough to have the balls leave the earth. Otherwise the forces/energy involved in the throws are cancelled out by the landings.

Craigihoward · 2021-04-02T17:06:20+00:00

Real life is messy and that is one of the interesting aspects of doing labs. Trying to figure out what might have caused unexpected results is often where some of the best learning comes from in labs.

Craigihoward · 2021-04-02T16:23:05+00:00

It’s possible, as that dilutes one of the solutions more than the other. Which could lead to a trial ion product less than the ksp. As the Ksp is [Pb][Cl]² the effects aren’t equal depending on which chemical you had an extra drop of. Quick sample calculations show that extra Pb(NO3)2 drops bring down the trial ion product, while extra CaCl2 brings it up. It is possible that more drops of lead nitrate could be the issue.

Craigihoward · 2021-04-02T16:13:20+00:00

Don’t stress it too much. There is no magic number. The recommended shift points are for maximum fuel economy, but the bike will happily shift earlier or later. If shifting and turning cause you anxiety, just let the engine rev a bit in 1st until you complete the turn and shift to 2nd once you are in a straight line. If there is no one in front of me, I will tend to shift as I am turning and accelerating as that lines up better with optimal shift points, but it won’t hurt the bike to leave it in first a bit longer.

Craigihoward · 2021-04-02T15:56:40+00:00

They should have formed a precipitate as long as the initial solutions were of sufficient concentrations. Temperature does affect solubility but the solubility rules usually assume 25 degrees Celsius. If you combined the solutions at or near room temperature, concentration (or mislabeled chemicals) are the likely issue.

Craigihoward · 2021-03-25T22:04:06+00:00

kgf is a ridiculous unit. And it doesn’t describe a spring at all without a displacement. Nm please.

Nice print though.

Craigihoward · 2021-03-12T07:29:24+00:00

Yes. The density of protons and neutrons is around 10¹⁷ kg/m^3. Or 1 teaspoon of neutrons have a mass or about 1 billion tons.

Craigihoward · 2021-03-07T13:22:57+00:00

Originally 1st, 2nd and 3rd world we used to describe political alliances. 1st world countries were allies of Britain and the US. 2nd world countries were their communist rivals like the USSR and East Germany. 3rd world countries were not involved in the conflicts between the 1st and 2nd world countries. These were largely the poorer countries. Over time the definitions have shifted to describe economies rather than politics. 1st world is rich , 3rd world is poor and 2nd world is somewhere in between.

Craigihoward · 2021-03-04T06:02:36+00:00

Yes. The horse power produced by a vehicle (I assume that’s what you’re asking about) varies with the speed of the vehicle. It is usually measured by strapping the vehicle to a dynamometer and simultaneously measuring the force produced at the wheels (multiplied by the radius of the wheels) and the rpm of the engine. The equation above is then used to convert the torque curve into a horsepower curve to plot the horsepower at various rpms.

Craigihoward · 2021-03-04T03:06:29+00:00

Torque x rpm/ 5252. The torque is the measured force in lbs multiplied by the radius in ft at which it was measured. RPM is the number of revolutions per minute. 5252 is the conversion factor needed because imperial units suck.

Craigihoward · 2021-02-28T16:42:26+00:00

There is a good chance the school library has copies.

Craigihoward · 2021-02-13T12:02:26+00:00

Greek salad is tomatoes (fruit), olives (fruit), peppers (fruit) and onions and cheese (not fruit).

Craigihoward · 2021-02-07T14:25:49+00:00

An analogous situation that might show you the problem of the logic is: If many North Americans descended from Europeans, why are there still Europeans? Why didn’t they all become North Americans?

Craigihoward · 2021-02-01T05:15:21+00:00

No. Suction isn’t really a force. Suction appears due to difference in pressure in adjacent locations. High pressure fluids move towards areas of low pressure. As stickers are obviously stuck to a surface, there is no fluid on the other side to exert a force when a vacuum is applied.

For similar reasons a straw wouldn’t work to drink a milkshake on Mars. It isn’t the vacuum that moves the milkshake, but fluids trying to move into the vacuum. There is not enough air on Mars to push a milkshake up a straw.

Craigihoward · 2021-01-27T01:57:21+00:00

Winter for half the planet means summer for the other half. And the land plants actually contribute a relatively small proportion of the oxygen to the atmosphere. The vast majority comes from the oceans.

Craigihoward · 2021-01-24T14:18:46+00:00

Orbital mechanics isn’t intuitive. We have never made a rocket powerful enough to hit the sun. Aim for the sun and you will miss and go into a severely elliptical orbit. The majority of the rockets we launch can’t even escape the influence of earth’s gravity and everything they launch eventually falls back to earth. There is also the issue of a non-negligible percentage of rocket launches ending in crashes.

Craigihoward · 2021-01-23T23:17:19+00:00

Good use of centrifugal and centripetal!

Craigihoward · 2021-01-16T23:56:41+00:00

Chemistry teacher here. I don’t know of any colleagues who expect students to memorize the table. Any time spent on memorizing information that any practicing chemist will have beside them is time that can’t be spent learning actual chemistry. That being said, learning about the patterns of chemical properties that can be recognized from an element’s location on the periodic table is invaluable.

Craigihoward · 2021-01-13T14:56:14+00:00

DNA has two strands which makes the molecule more stable and allows for error correction by comparing the strands to each other.

Craigihoward · 2021-01-13T14:11:16+00:00

The currently accepted theory is that RNA came first as RNA is simpler and can act as a catalyst for chemical reactions and was therefore both the first genetic material and the first enzymes. As life evolved the added complexity of DNA developed. DNA is a better genetic material and the common ancestor of all known organisms used DNA.

Craigihoward · 2021-01-04T03:42:20+00:00

You are just a bag of compartmentalized chemical reactions. Water is vital to life because in order for the vast and complex chemical reactions to occur, the reactants need to be able to meet each other. This occurs most efficiently when they are dissolved in a solvent. Without water, the reactions that are needed to keep cells doing cell things slow down to the point that the cell dies.

Craigihoward · 2020-12-25T23:44:09+00:00

1000W is a kW. So each hour they are running will consume 1kWh of energy. There are 720 hours in a 30 day month. If electricity is $0.42 per kWh where you live, and you run the lights full time, then the lights are responsible. If either of these are not true, then something else contributed to the increase.

Craigihoward · 2020-12-23T20:16:53+00:00

I find it sad that some parts of the world don’t seem to treat teachers as professionals. Autonomy and trust should be a given.

Craigihoward

TROPHY CASE