Andrea wants to measure how far each of her classmates can throw a heavy ball. some of her classmates can throw it more than a meter. she has her choice of tools with which to measure the distance: a 30 cm ruler, 15 cm calipers, or a 5 m tape measure. which of the above would it be best for andrea to use, and why? a. the calipers would be best because they can measure distances much more precisely than the other tools. b. the tape measure would be best because it is long enough to span the entire distance being measured. c. the ruler would be best because it cannot bend, so it will measure the distance in a straight line. d. the tape measure and the ruler would work equally well, but the calipers are too small to be used to measure distance.
2)Meters allow scientists to be more accurate.
5)Two stars very close together.
7)A elevator coming to a stop in order to stop at the top floor.
8)Size of the ofject
(9.64 +- 0.86) m/s^2
The generic motion equation for constant acceleration is
X0: initial position
v0: initial speed
If the object has an initial speed of zero, and the frame of reference is set conveniently so that the object initial position is zero, the equation simplifies to:
And the acceleration can be obtained as:
Where x is the distance fallen and a = g.
So, with the data x = (100.0 +- 0.03) mm and t = (144 +- 3) ms we can calculate
For the uncertainty we have to calculate the relative uncertainties first
For the distance (100 * 0.3)/100 = 0.3%
For the time (100 * 3)/144 = 2.08%
For multiplications or divisions the relative uncertainties are added
0.3% + 2.08% + 2.08% = 4.46%
We convert this into absolute uncertainty:
(9.64e-3 * 4.46)/100 = 0.00043 mm/(ms^2)
Finally, this is multiplied by a constant scalar, so:
2 * 0.00043 mm/(ms^2) = 0.00086 mm/(ms^2)
We convert the units
And the measurement is (9.64 +- 0.86) m/s^2
A better method is putting the ball in a ramp instead of a free fall, that way the fall is longer and the effect of time measuring uncertainty is reduced.
a telescope on Mars
As you can see in the parallax diagram in the video or your textbook, the base of the parallax triangle is the Earth-Sun distance, and making this baseline distance larger would increase the parallax angle to any star, making the angle easier to measure. Of the choices given, only locating the telescope on Mars would make this baseline distance larger. Therefore, the telescope on Mars would be able to measure parallax for more distant stars than it would in any of the other locations.
Light years are the only practical unit for measuring the distance of space
Practical... aka logical.
Lines of latitude measure distance north and south, while lines of longitude measure distance west and east.
In the earth, there are imaginary lines that runs from one point to the another. This lines could be from the North pole to South pole. And, also, it could be from the East pole on the earth surface to the West pole. Both lines are commonly called the Latitude lines and the Longitude lines.
we love connexus kids
The distance between the points of observation has a significant impact on the shift in parallax. Imagine if you were an alien, and your eyes were several inches or even a foot apart. The shift in parallax that your thumb experienced during the experiment would be profoundly different compared to your human classmates. This consideration, the distance between the points of observation, is very important in parallax measurements.
too small to be measured with common instruments.
I'm not sure that parallax can even be used out to a few
thousand light years.
The NEAREST star to Earth has the BIGGEST parallax.
The star is Alpha Centauri. It's only 4 light years away
from us, and its parallax is 0.000206 of a degree !
I have no idea how astronomers can measure angles
so small ... and that's the BIGGEST parallax angle of
1. Nope. If the net forces are zero, it means that the object is at an equilibrium state (may be static of dynamic), and thus implies the forces cancel or balance each other out.
2. It's actually air resistance. I suggest you read about Aristotle's and Galileo's experiment about the topic (gravity).
3. Ain't sure with this one. ^^;
4. Recall that gravitational force can be measure using the formula:
F = G*m1*m2 / r^2
where m1 and m2 are the masses of the objects, and r is the distance between them.
Thus, F is largest when the objects are very massive, and they are close with each other. And therefore, it's "two stars very close to each other".
5. I think it's the rolling friction, because there would be less contact between the tracks and the wheels of the train.
6. It's "a cruise ship travels west at a constant speed". Note in order to have a constant velocity, you must have both magnitude and direction as constant.
7. It's the size of the object. Note that distance, velocity and acceleration are the essential concepts of kinematics.
the packers and the chiefs played in the first super bowl, which was held in los angeles in 1967. -is the sentence that would stand out the most when scanning a paragraph.
sir frederic attributed inaccuracies to schemas. memory reconstruction is one part actual events and one part personal schema, which can result in inaccuracies when memories are reconstructed.