Why is it hazardous to use too small cables and electrodes for a too high current?

Answers

Answer 1
Answer:

Answer:

It is hazardous to use too small cables and electrodes for too high of a current because the cable may explode because it can't take so much electricity and may damage other parts of the circuit or other wires.


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If the stone loses 10% of its speed in 10 s of grinding, what is the force with which the man presses the knife against the stone?

Answers

w1=200rpm*2pi/60=20.9rad/s

w2=200rpm-.10(200rpm)=180rpm
 
180rpm*2pi/60=18.8rad/s

a=(18.8-20.9)/10= -.21rad/s^2

I=1/2(28)(.15)^2
 I=.315kg*m^2
Torque= -.21(.315)=.06615 N*m
Friction force= -.06615/.15=-.441 N
Normal force of man=.441/.2= 2.205 N
 Final answer: -2.205 N


A current of 2.0A flows through a light bulb. What is the amount of charge flowing through the light bulb in 40 seconds?

Answers

Answer:

Quantity of charge = 80 Coulombs

Explanation:

Given the following data;

Current = 2 A

Time = 40 seconds

To find the amount of charge flowing through the light bulb;

Mathematically, the quantity of charge passing through a conductor is given by the formula;

Quantity of charge = current * time

Substituting into the formula, we have;

Quantity of charge = 2 * 40

Quantity of charge = 80 Coulombs

White light is shining on a green grape. The grape _____.absorbs green light
reflects green light
reflects all colors of light except green
transmits green light

Answers

The grape absorbs all colors except green, and green light is the
only light that remains to bounce around and enter people's eyes. 

This is a big part of the reason why, whenever somebody looks at
the grape, they remark "Oh look !  The grape is green !"

Answer:

reflects green light.

Explanation:

A block of wood has a volume of 125 cm has a mass of 27 g. What is the density of this block ?

Answers

Answer:

27/125

(3/5)³

(0.6)³

0.216 gm/cm³ or g/cc

Explanation:

  • Given:
  • Volume = 125 cm³
  • mass: 27 grams

Here Density is actually the amount of matter present in unit volume.

  • Mathematically, rho(like p) (tapering downwards) = Mass/Volume
  • Putting, 27/125 g/cm³

0.216 g/cc

The boy on the tower throws a ball 20 meters downrange as shown.What is his pitching speed? (Take g = 9.8 m/s²)
Show work clearly and completely (including formulas, calculations, units, etc. as done in class.)

Answers

The problem states that the ball is thrown 20 meters downrange. Since the ball is thrown horizontally, we can assume that the initial vertical velocity is zero. The only force acting on the ball is gravity, which causes it to accelerate downwards at a rate of 9.8 m/s² 1.

To calculate the pitching speed, we need to find the time it takes for the ball to travel 20 meters horizontally. Unfortunately, this information is not provided in the problem statement. Therefore, we cannot calculate the pitching speed.

Within a single use of the scientific method, which of the following steps can only be performed afterdata is collected?
A. Controls and variables are chosen.
B. The initial experiment is designed.
C. The initial hypothesis is formed.
D. Conclusions are drawn.

Answers

Within a single use of the scientific method, the step which would be performed after we collect data, would be the drawing of a conclusion out of the answers that you've presented - D.

It is usually the case that you first have to analyze the data after you've gather it and then you base your conclusions on it. This isn't, however, always the case.