PHYSICS HIGH SCHOOL

A material has a net electric charge because it _____.A. has friction between electrons and protons

B. has the ability to create static discharge

C. has an excess or shortage of electrons.

D. has a large atomic nucleus

Answers

Answer 1
Answer: C. has an excess or shortage of electrons.

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Currently, Earth's tilt is closest to _____.A. 0°
B. 14.5°
C. 23.5°
D. none of these because, Earth's tilt changes dramatically with each orbit

Answers

The answer is C. 23.5°. It's because of this tilt that the Earth experiences seasons as it orbits around the Sun. Imagine the Sun is at the center of a spinning record.

What is the relationship among amplitude,crest,and trough?

Answers

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What happens to a mirror when a ray is directed at it

Answers


Nothing happens to the mirror. 

However, if the ray is within some suitable range of
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Name three situations in which force is created. describe the cause of the force in each situation

Answers

One situation in which force is created is when an object is moving and a force is created to stop that movement. Second situation is when an object is moving circularly and a force is created to move it towards the middle of the circle. The third situation is when a force is created that goes in the same direction as an object that is in movement.

Plss help plss i need it now​

Answers

Answer:

anong grade po. yan?

seven po ba yan

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 .


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