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Alika [10]
3 years ago
8

Which pf these measurements has 3 significant digits?

Physics
1 answer:
borishaifa [10]3 years ago
6 0
What measures we can't answer without the measures
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How far did a frog jump if he travels at a rate of 2.1 m/s for 10 seconds?
Anestetic [448]

Answer:

21 m

Explanation:

The motion of the frog is a uniform motion (constant speed), therefore we can find the distance travelled by using

d=vt

where

d is the distance covered

v is the speed

t is the time

The frog in this problem has a speed of

v = 2.1 m/s

and therefore, after t = 10 s, the distance it covered is

d=(2.1)(10)=21 m

3 0
4 years ago
What could be used as another word for electrical potential
tekilochka [14]

Answer:

hey mate

answer is probably voltage as per me

as

Explanation:

Voltage, electric potential difference, electric pressure or electric tension is the difference in electric potential between two points, which is defined as the work needed per unit of charge to move a test charge between the two points

5 0
3 years ago
Read 2 more answers
It’s estimated that there are a trillion comets in the Oort cloud, which extends out to about 50,000 AU.How much space does each
dexar [7]

Answer:

  1. Each comet has 523 UA³
  2. The typical spacing would be 8.05 UA
  3. 2.0181x10^21 Joules

Explanation:

  1. Assuming comets are evenly distributed we can find first the volume of a sphere with the formula frac{{4}{3}}πr³ using 50000 as the radius, and then dividing this volume by the amount of comets. This gives a the space each comet has on average.
  2. We apply the cube root as proposed in the question.
  3. The kinectic energy is given <em>K=frac{{1}{2}}mv² where m is the mass and v is the velocity. Apropriate unit are given in the question.</em>

5 0
4 years ago
Harry Potter decides it’s too cold for him to stay in Hogwarts and wants to fly straight south. He is not sure where to point hi
posledela

Answer:

50k is the km for this is the first send

3 0
2 years ago
Lines of a particular element appear at the same wavelength in both emission and absorption line spectraTrue or False
Hatshy [7]
<h2>Answer: True </h2>

Each atom emits or absors electromagnetic radiation, but only in some frequencies that are characteristic of its chemical element.

Now, if we supply energy in the form of heat (thermal energy) to a certain element in its gas phase, this will be stimulated  and its atoms will emit radiation in certain frequencies of the visible spectrum, which constitute its <u>emission spectrum</u>.

If the same element, also in gaseous state, receives electromagnetic radiation, it absorbs in certain frequencies of the visible spectrum, precisely the same ones in which it emits when it is stimulated by heat. This will be its <u>absorption spectrum</u>.

This means that every element absorbs radiation in the same wavelengths in which it emits it.

8 0
3 years ago
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