PHYSICS HIGH SCHOOL

A ball is thrown into the air at some angle. At the very top of the ball's path, its velocity isa. entirely vertical.
b. There's not enough information given to determine.
c. both vertical and horizontal.
d. entirely horizontal.

Answers

Answer 1
Answer:

When the ball should be thrown into the air so the velocity of the ball should be entirely horizontal.

The following information should be considered:

  • The object should continue for travel having a similar velocity till the external force should be applied.
  • Also, no external forces should be there in the case when it is horizontal direction except air resistance.
  • The gravity force should be downwards at 9.8m/s^-2 towards the ground. At the time when the ball is at the highest point so the ball stops so, it can't be vertical.

Therefore, we can conclude that when the ball should be thrown into the air so the velocity of the ball should be entirely horizontal.

Learn more: brainly.com/question/17127206

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Answer 2
Answer: Entirely horizontal.

An object will continue to travel with the same velocity unless an external force is applied.
There are no external forces acting in the horizontal direction (except air resistance but the is negligable) so the ball will move in the horizonontal direction with with same speed at all times.
Force of gravity is acting downwards, meaning it is constantly acelleraring at 9.8ms^-2 towards the ground. When the ball reaches its heighest point, it is where the ball has stopped moving up and starts to move down, therfore it is not moving vertically at all.

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What type of machine is a pair of scissors?a. Simple - Lever
b. Simple - Wedge
c. Compound - Lever and Wedge
d. Compound - Inclined plane and lever.

Answers

The type of machine of a pair of scissors is a compound machine classified as lever and wedge. The answer is letter C. The pivot joint is the lever and the wedge are the blades of the scissors. This is to efficiently exert force on an object to cut it.

A student pushes a box across a rough horizontal floor. If the amount of work done by the student on the box is 100 J and the amount of energy dissipated by friction is 40 J, what is the change in kinetic energy of the box

Answers

Answer:

60J

Explanation:

friction is the opposition to the motion of an object. Before a body can be set in motion, part of the energy or work-done must be used to overcome friction.

While kinetic energy is the energy associated with a body due to its motion.

Since friction tends to oppose the motion of a body,when a body start to move, some of the energy applied to the body to cause its motion is converted to heat due to friction.

Hence if a work-done of 100J is applied to a body that requires 40J of the work to overcome friction, the total change in the kinetic energy can be expressed as

K.E=100J-40J\nK.E=60J\n

Two harmonic waves moving in the same direction are described by y1(x,t)=10.2sin(4x-700t) and y2(x,t)=10.2sin(4x-700t-7.9). What is the amplitude of the resultant wave at interference

Answers

Answer:

14.42 units

Explanation:

The waves are given as follows :

y_1(x,t)=10.2\sin(4x-700t)\n\ny_2(x,t)=10.2\sin(4x-700t-7.9)

We need to find the amplitude of the resultant wave at interference. Let it be A. So,

A=√(10.2^2+10.2^2) \n\n=14.42\ units

So, the amplitude of the resultant wave is equal to 14.42 units.

Over time how will erosion and deposition affect a mountain range?Explain.

Answers

Answer : Over a period of time mountain ranges will undergo soil erosion or surface run off due to rains on mountains; the soil over the mountain will be washed away along with the wind or water and get deposited in the nearby valleys.

This process continues and the place from where the soil is eroded gets deposited with another layer of soil from top of the mountain from where the soil erosion occurs.

This cycle continues and the erosion and deposition process also keeps going on.
Over millions of years, erosion slowly wears away mountains while deposition fills in valleys with sediment.  The cycle of erosion and deposition is never-ending.

The line of sight from a small boat to the light at the top of a 45-foot lighthouse built on a cliff 25 feet above the water makes a 20° angle with the water. To the nearest foot, how far is the boat from the cliff?

Answers

Answer:

The boat is 192 feet from the cliff.

Explanation:

Hi there!

Please see the attached figure for a graphical description of the problem.

Notice that the line of sight, the distance to the cliff and the height to the top of the lighthouse form a right triangle. Hence, we can apply trigonometric rules to find the distance from the boat to the cliff:

cos 20° = adjacent side / hypotenuse

sin 20° = opposite side / hypotenuse

The length of the opposite side is the height of the cliff plus the height of the lighthouse:

opposite side = 45 feet + 25 feet = 70 feet.

Using the equation of sin 20°, we can obtain the hypotneuse:

sin 20° = opposite side / hypotenuse

hypotenuse · sin 20° = opposite side

hypotenuse = opposite side / sin 20°

hypotenuse = 70 feet / sin 20°

hypotenuse = 205 feet

Now, using the equation of cos 20°, we can calculate the distance to the cliff (the length of the adjacent side):

cos 20° = adjacent side / hypotenuse

hypotenuse · cos 20° = adjacent side

205 feet · cos 20° = adjacent side

adjacent side = 192 feet  (without rounding intermediate results)

The boat is 192 feet from the cliff.

Answer:

192 ft.

Explanation:

Tan (20) = Opp/Adj

Tan (20) = (45+25)/x

Tan (20) =  70/x

then x=70/Tan (20)

x= 192.3234 ft, and then rounded to the nearest foot...

x= 192 ft

What is the closest universe to Earth?

Answers

"Universe" means "everything ... all space and all time".

So there's only one universe, we're in it, and the one that
we're in is the closest one.
As when know of right now, well... we actually don't know if there is a "multiverse". GOD knows, however, you should ask him.
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