PHYSICS HIGH SCHOOL

The equation for the chemical reaction shown is not balanced. What number should replace the question mark to balance this equation?2KBr + ?Pb(NO3)2 → 2KNO3+ PbBr2

A.
The equation is balanced as is.

B.
A 6 is required.

C.
A 3 is required.

D.
A 2 is required.

Answers

Answer 1
Answer: The equation is balanced as it is.

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The total amount of electrical energy used by a315-watt television during 30.0 minutes ofoperation is(1) 5.67 × 10^5 J (3) 1.05 × 10^1 J(2) 9.45 × 10^3 J (4) 1.75 × 10^1 J
The active sections that are located along fault lines are called A. seismic gaps. B. seismic risks. C. stress accumulations. D. recurrence gaps
A 3-ohm resistor and a 6-ohm resistor areconnected in parallel across a 9-volt battery.Which statement best compares the potentialdifference across each resistor?(1) The potential difference across the 6-ohmresistor is the same as the potentialdifference across the 3-ohm resistor.(2) The potential difference across the 6-ohmresistor is twice as great as the potentialdifference across the 3-ohm resistor.(3) The potential difference across the 6-ohmresistor is half as great as the potentialdifference across the 3-ohm resistor.(4) The potential difference across the 6-ohmresistor is four times as great as the potentialdifference across the 3-ohm resistor.
a tuna fish is streamlined to reduce friction which describes the type of of friction the fish must overcome

The air pressure at the ocean surface a few miles from the shoreis most likely

Answers

The air pressure is most likely lower.

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine? A. 97 percent B. 96 percent C. 94 percent D. 92 percent

Answers

your answer is  C. 94 percent

i just took the test

should your directions to a friend for traveling from one city to another include displacements or distances?Explain

Answers

Displacements because it includes direction since you want to lead your friend to the right place. If you only include distances then it's like which way should they go. They don't know if it's north, east, south or west. They also don't know if they should travel in a straight line or do they have to make a lot of turns

A tropical storm turns into a hurricane when wind speeds reach?

Answers

A tropical storm turns into a hurricane when wind speeds reach more than 33 knots. It happens when the tropical depression strengthens and then the speed of the wind starts increasing and reaches a stage when it is called a hurricane. Right type of condition can create a powerful hurricane, but when the right conditions are not there, then the storm fizzles out. 

Answer:

74mph

Explanation:

the internet

A speedy rabbit is hopping to the right with a velocity of 4.0 \,\dfrac{\text m}{\text s}4.0 s m ​ 4, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction when it sees a carrot in the distance. The rabbit speeds up to its maximum velocity of 13 \,\dfrac{\text m}{\text s}13 s m ​ 13, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction with a constant acceleration of 2.0 \,\dfrac{\text m}{\text s^2}2.0 s 2 m ​ 2, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, squared, end fraction rightward.

Answers

Answer: 38.25 m

Explanation:

In this situation we need to find the distance d between the rabbit and the carrot, and we can use the following equation, since the rabbit's acceleration is constant:

V^(2)=V_(o)^(2) + 2ad(1)

Where:

V=13 m/s is the rabbit's maximum velocity (final velocity)

V_(o)=4 m/s is the rabbit's initial velocity

a=2 m/s^(2) is the rabbit's acceleration

d is the distance between the rabbit and the carrot

Isolating d:

d=(V^(2)-V_(o)^(2))/(2a)(2)

d=((13 m/s)^(2)-(4 m/s)^(2))/(2(2 m/s^(2)))(3)

Finally:

d=38.25 m

Answer:

4.5s

Explanation:

Cause that's what it says on my test hints

What did Ernest Rutherford expect to happen when he aimed a beam of particles at a thin gold foil?

Answers

When Ernest Rutherford aimed a beam of particles at a thin gold foil he expected that the particles would be deflected slightly after passing through the foil.

Further Explanation;

An atom  

  • An atom is the smallest particle of an element that takes part in a chemical reaction.
  • It is made up of a nucleus and energy levels.
  • Atoms contain sub atomic particles; electrons found in the energy levels, neutrons and protons found in the nucleus of the atom.
  • Electrons are negatively charged, protons are positively charged while neutrons have no charge.
  • The positive charge of protons gives nucleus a positive charge which attracts the opposite charged electrons.  

Rutherford Experiment

  • Rutherford carried out an experiment where he fired alpha particles at a piece of gold foil.
  • He found that about 1/800 of the alpha particles fired bounced back off of the gold foil.
  • He therefore, concluded that there was a part of the atom that was very dense, and that there was also lots of empty spaces.
  • According to Rutherford's model an atom contains a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus similar to the structure of the Solar system.

Shortcoming of Rutherford's model

  • Rutherford's model of the atom failed to explain why electrons were not pulled into the atomic nucleus by the attraction of opposite charges of the nucleus and electrons.

Keywords: Atom, Rutherford experiment, gold foil, nucleus of an atom, setbacks of Rutherford's model

Learn more about:

Level: High school  

Subject: Chemistry  

Topic: Structure of an atom and Atomic models

Sub-topic: Rutherford's and Bohr's model
The particles would be deflected slightly after passing through the foil
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