PHYSICS HIGH SCHOOL

Which scientist first made a model of the atom called the plum pudding model?John Dalton
J.J. Thomson
Ernest Rutherford
Neils Bohr

Answers

Answer 1
Answer: The plum pudding model of theatom by the scientist Sir Joseph John Thompson or J.J. Thompson. It wastheorized after the discovery that electrons are present in the atom. In thismodel, the atom is composed mainly of electrons. It was describe as plum puddingbecause the electrons are dispersed within the atom. John Dalton discovered theatom. Ernest Rutherford discovered the half – life of an atom and Neils Bohrexplain the quantum mechanics. So the answer is J.J. Thompson.

Related Questions

Many physical quantities are connected by inverse square laws, that is, by power functions of the form f(x)=kx^(-2). In particular, the illumination of an object by a light source is inversely proportional to the square of the distance from the source. Suppose that after dark you are in a room with just one lamp and you are trying to read a book. The light is too dim and so you move halfway to the lamp. How much brighter is the light?
Convert 56 kilometers to inches
Which process in the water cycle do plants perform
Radioactive isotopes are used to treat cancer true or false
A bowl contained 19.1 grams of salt. Then, Kaitlin poured in another 77.49 grams. How much salt does the bowl contain now?

A stone is thrown with an initial velocity of 20 meters per second straight upward from the edge of a cliff 100 meters above a canyon floor. The stone just misses the cliff'a edge on its way down. (Neglect friction) Calculate the time required for the stone to reach its maximum height.
Calculate the maximum height of the stone above the edge of the cliff.

Answers

The time taken by the stone to reach the maximum height above the cliff is \boxed{2.04\text{ s}} and the maximum height reached by the stone above the cliff is \boxed{20.4\text{ m}}.

Explanation:

Given:

The initial velocity of the stone is 20\text{ m/s}.

The height of the cliff is 100\text{ m}.

Concept:

As the stone is thrown upward from the top of the cliff, the stone will move under the action of the acceleration due to gravity. The speed of the stone will decrease as it moves up because the acceleration on the stone is acting in the direction opposite to its motion.

The speed of the stone at its maximum height will be zero where is comes to rest for a moment.

The time taken by the stone to reach the maximum height is given by:

\boxed{v_f=v_i-gt}

Here, v_f is the final velocity, v_i is the initial velocity, g is the acceleration and t is the time taken by the stone.

Substitute the values in above expression.

\begin{aligned}0&=20-(9.81)t\nt&=(20)/(9.81)\text{ s}\n&=2.04\text{ s}\end{aligned}

The distance covered by the stone in reaching the maximum height is given by:

\boxed{v_f^2=v_i^2-2gS}

Here, S is the distance covered by the stone.

Substitute the values in above expression.

\begin{aligned}(0)^2&=(20)^2-2(9.81)S\nS&=(400)/(19.62)\text{ m}\n&=20.4\text{ m}\end{aligned}

Thus, The time taken by the stone to reach the maximum height above the cliff is \boxed{2.04\text{ s}} and the maximum height reached by the stone above the cliff is \boxed{20.4\text{ m}}.

Learn More:

1. Compare the three types of friction brainly.com/question/1800116

2. The scale reading if the cable breaks suddenly brainly.com/question/4852539

3. The height of bridge above water brainly.com/question/10664397

Answer Details:

Grade: Senior School

Subject: Physics

Chapter: Kinematics

Keywords:

stone, initial velocity, final, thrown, cliff, canyon floor, maximum height, zero, acceleration, gravity, time taken, distance.

I thought you were going to ask how long it takes for the stone to hit
the canyon floor at the bottom of the cliff.  But you're not asking for
anything after the stone barely misses the edge of the cliff on its way
down, and you're only asking about things that happen above the
edge of the cliff. So we don't need to know anything about the cliff,
or its height above anything else.  The thrower might just as well be
standing in his front yard when he throws the stone straight up.

-- Gravity robs 9.8 m/s from the stone's upward speed every second.
So the stone reaches its maximum height, runs out of upward gas, and
starts falling, in  (20 / 9.8) = 2.04 seconds after the toss.

-- Its average speed during that time is (1/2) (20 + 0) = 10 m/s .
In 2.04 seconds at that average speed, it rises (2.04 x 10) = 20.4 meters .


jamie is not sure a new medication will work because it has not had a large test group. Is jamie being creative?

Answers

No, he is being skeptical.

In the situation above Jamie doubts because the test was done with a small sample. He thinks the results are uncertain because it is needed a big sample to avoid mistakes and icrease the reliability of the study. So, this leads to scepticism, which means doubt about the truth of something, this is what Jamie does in the situation, this is why he is being skeptical.  
no, they're being skeptical.

A toaster oven has a power rating of 1200W. If you cook a pizza in it for 1 hour at 450°F, how manyjoules of electrical energy are converted into heat by the toaster oven?

Answers

Answer;

= 4,320,000 joules

Explanation;

Power is the ratio of Work per unit time. When work is done in a given span of time, the ratio of work performed with respect to time is called Power.

Therefore;

Power = Work done/time

Power = 1200 Watts and t = 1 hour or 3600 seconds

Thus;

Work done = Power × time

                   = 1200 ×  3600

                   = 4,320,000 joules or 4320 kJ

A pendulum takes 10 seconds to swing through 2 complete cycles.a. How long does it take to complete one cycle?
b. What is its period?
c. What is its frequency?

Answers

Answer:

a. 5 seconds

b. 5 seconds

c. 0.2 Hz

Explanation:

a) For 2 complete cycles, time taken is 10 s.

Thus, for 1 complete cycle, the pendulum would take = 10 s÷ 2 = 5 s

b) The time period of a pendulum can be defined as time to complete 1 cycle/oscillation. This is calculated in part a. Thus, time period of the pendulum is 5 s.

c) The frequency of a pendulum can be define number of cycles/oscillations in 1 s. It takes 5 s to complete 1 cycle.

In 1 s, number of cycles = (1 ÷ 5) s⁻¹ = 0.2 Hz.

Una sustancia radioactiva, cuya temperatura es inconstante, aumenta su temperatura en 30ºF, luego disminuye e 40ºC, luego aumenta en 12R y por último disminuye en 10K; entonces la temperatura final de dicha sustancia: a) No varia b) Aumenta en 24R c) Disminuye en 48R d) Aumenta en 48R e) Disminuye en 24R

Answers

Answer:

What the heck

Explanation:

Evelyn learns that a sound wave can be recorded electronically as an analog signal or as a digital signal. She investigates these two signal types. She records her voice using a tape recorder, which uses an analog signal to produce sound when played back. She also records her voice using a computer, which uses a digital signal to produce sound when played back. Evelyn replays each recording 100 times.a. Describe a difference that Evelyn would most likely hear between the two recordings after being replayed 100 times.

b. Explain why the two recordings would sound different after being replayed 100 times.

Answers

a)The analog signal'spitch and frequency change each time. It is continuous in the digital signal.

What is the digital signal?

A digital signal is one in which data is represented as a series of discrete numbers.

To reduce the influence of noise in communication, a digital signal is utilized. When compared to analog signals, digital signals convey more information per unit of time.

a)Evelyn would most likely notice a difference between the two recordings after hearing them 100 times is that the analogsignal's pitch and frequency change each time. It is continuous in the digital signal.

b)After 100 replays, the two recordings would sound different since the digital signal has a greater quality throughout long-distance transmission.

When digital signals are transferred, the amount of bandwidth used is lowered.

Hence, the digital signal has a greater quality throughout long-distance transmission causing two recordings would sound different.

To learn more about digital signals refer to:

brainly.com/question/14825566

#SPJ1
Other Questions
A net force of -1,000 Newtons is delivered to the object over a time of .02 seconds. Calculate the new velocity of the object.
Kira jogs to a store 72 miles away in a time of 36 seconds. What is Kira's average speed?
A 17,000-kg airplane lands with a speed of 82 m/s on a stationary aircraft carrier deck that is 115 m long. find the work done by nonconservative forces in stopping the plane
Collect information about working of Geyser and prepare a report