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vodka [1.7K]
3 years ago
7

Pick 3 safety rules in science that you think are important and explain what would happen if the rules were no followed. Used yo

ur own word.
Physics
1 answer:
IgorLugansk [536]3 years ago
7 0

Answer:

Answer down below!

Explanation:

  1. Always wear goggles! This is to prevent chemicals or any other substance to get into your eyes. If this wasn't followed, more people could get hurt.
  2. Clean up afterwards! Its always better to clean up so someone else couldn't get hurt! If people don't follow this, it could be a mess and someone could get seriously injured.
  3. When smelling something, waft it to your face, and not get real close. This is to prevent getting chemicals into your body that could be poisonous. If people didn't folloe this, someone could be seriously sick.
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You decide to travel by car for your holiday visits this year. You leave early in the morning to avoid congestion on the roads.
Bond [772]

Answer:

d_t=266.918\ miles is the total distance of the trip travelled.

s_{avg}=54.7895\ mph is the average speed of the journey

Explanation:

Given:

  • duration of first interval, t_1=3.22\ hr
  • speed during the first interval, v_1=65.9\ mph
  • duration of stoppage, t_0=42.1\ min=0.7017\ hr
  • duration of second interval, t_2=0.95\ hr
  • speed during second interval, v_2=57.6\ mph

<u>Now the total distance travelled:</u>

\rm distance=speed\times time

d_t=v_2.t_2+v_1.t_1

d_t=57.6\times 0.95+65.9\times 3.22

d_t=266.918\ miles

<u>The average speed:</u>

\rm speed_{avg}=\frac{total\ distance}{total\ time\ taken}

s_{avg}=\frac{d_t}{(t_0+t_1+t_2)}

s_{avg}=\frac{266.918}{(0.7017+3.22+0.95)}

s_{avg}=54.7895\ mph

4 0
4 years ago
Suppose that the speed of an electron traveling 2.0 km/s is known to an accuracy of 1 part in 105 (i.e., within 0.0010%). What i
OverLord2011 [107]

Answer: 2.89(10)^{-3} m

Explanation:

The <u>Heisenberg uncertainty principle</u> postulates that the fact each particle has a wave associated with it, imposes restrictions on the ability to determine its position and speed at the same time.  

In other words:  

It is impossible to measure simultaneously (according to quantum physics), and with absolute precision, the value of the position and the momentum (linear momentum) of a particle. Thus, in general, the greater the precision in the measurement of one of these magnitudes, the greater the uncertainty in the measure of the other complementary variable.

Mathematically this principle is written as:

\Delta x \geq \frac{h}{4 \pi m \Delta V} (1)

Where:

\Delta x is the uncertainty in the position of the electron

h=6.626(10)^{-34}J.s is the Planck constant

m=9.11(10)^{-31}kg is the mass of the electron

\Delta V is the uncertainty in the velocity of the electron.

If we know the accuracy of the velocity is 0.001\% of the velocity of the electron V=2 km/s=2000 m/s, then \Delta V is:

\Delta V=2000 m/s(0.001\%)

\Delta V=2000 m/s(\frac{0.001}{100})

\Delta V=2(10)^{-2} m/s (2)

Now, the least possible uncertainty in position \Delta x_{min} is:

\Delta x_{min}=\frac{h}{4 \pi m \Delta V} (3)

\Delta x_{min}=\frac{6.626(10)^{-34}J.s}{4 \pi (9.11(10)^{-31}kg) (2(10)^{-2} m/s)} (4)

Finally:

\Delta x_{min}=2.89(10)^{-3} m

5 0
3 years ago
What is the length of the blues progression in this excerpt?
Gre4nikov [31]
<span>In blues musicians also often refer to chord progressions using Roman numerals, as this facilitates transposing a song to a new key. For example, rock and blues musicians often think of the 12 bar blues as consisting of I, IV and V chords. Thus a simple version of the 12 bar blues might be expressed as I/I/I/I IV/IV/I/I V/IV/I/I. By thinking of this blues progression in Roman numerals, a backup band or rhythm section could be instructed by a band leader to do the chord progression in any key. For example if the band leader asked the band to play this chord progression in the key of C Major, the chords would be C/C/C/C F/F/C/C G/F/C/C.</span>
5 0
3 years ago
Calculate the density of a solid of mass 20kg if it occupies a volume of 4m³​
choli [55]

Answer:

Density=Mass/Volume

            =20/4 kg/m^3

            =5 kg/m^3

4 0
3 years ago
What is the amount of a certain isotope that occurs in a natural sample of an element?
svet-max [94.6K]

last answer better for question

6 0
3 years ago
Read 2 more answers
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