The correct answer that would complete the given statement above would be option B. UNIT (of measurement). <span>A standard quantity of a physical property used as a factor to compare other occurring quantities of that property is called a unit of measurement. Hope this answers your question. </span>
Answer:
Explanation:
In this case we will use the Bohr Atomic model.
We have that:
We can calculate the centripetal force using the coulomb formula that states:
Where K=
and r is the distance.
Now we can say:
The mass of the electron is = Kg
The charge magnitud of an electron and proton are=
Substituting what we have:
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so:
Answer: Total work done on the block is 3670.5 Joules.
Step by step:
Work done:
With F the force, d the displacement, and theta the angle of action (which is 0 since the block is pushed along the direction of displacement, and cos 0 = 1)
Given:
F = 75 N
m = 31.8 kg
Final velocity
In order to calculate the Work we need to determine the displacement, or distance the block travels. We can use the information about F and m to first figure out the acceleration:
Now we can determine the displacement from the following formula:
Here, the initial displacement is 0 and initial velocity is also 0 (at rest):
Now we still have "t" as unknown. But we are given one more bit of information from which this can be determined:
(using vf as final velocity, and tf as final time)
So it takes about 6.44 seconds for the block to move. This allows us to finally calculate the displacement:
and the corresponding work:
<h3>
Answer:</h3>
43.48 mph
<h3>
Explanation:</h3>
<u>We are given;</u>
First instance;
- Distance = 50 miles
- Speed = 40 mph
Second instance;
- Distance = 20 miles
- Speed = 55 mph
We are required to determine the average speed for the entire journey.
- Average speed = Total distance ÷ total time
- We need to calculate time;
Time = Distance ÷ speed
First instance
Time = 50 miles ÷ 40 mph
= 1.25 hours
Second instance;
Time = 20 miles ÷ 55 mph
= 0.36 hours
Therefore;
Total distance = 70 miles
Total time = 1.25 hrs + 0.36 hr
= 1.61 hrs
Thus;
Average speed = 70 miles ÷ 1.61 hrs
= 43.478 miles per hour
= 43.48 mph
Answer: barometer
Explanation: An instrument that measures air pressure is called a barometer. One of the first barometers was developed in the 1600s. The original instrument had mercury in the small basin, with an upside down glass tube placed in the mercury.