PHYSICS HIGH SCHOOL

Which of the following does not represent a mechanical wave?sound
waves in the ocean
waves in a wheat field
light

Answers

Answer 1
Answer: The example that does not represent a mechanical wave is light. A mechanical wave requires a medium in order for it to travel and propagate. Examples of such is sound waves that travel through the air or ocean. Light is an electromagnetic wave because it makes use of particles called photons to propagate.
Answer 2
Answer:

Which of the following does not represent a mechanical wave?

light

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Assume that the upward direction is positive and the downward direction is negative. What is the ball's velocity (in m/s) when it returns to the level where it left your hand? (Indicate the direction with the sign of your answer.)

Answers

The given question is incomplete. The complete question is as follows.

You throw a ball vertically upward, and as it leaves your hand, its speed is 26.0 m/s.

(a) How high (in m) does it rise above the level where it leaves your hand?

(b) How long (in s) does it take to reach its highest point?

(c) How long (in s) does the ball take to return to the level where it left your hand after it reaches its highest point?

(d) Assume that the upward direction is positive and the downward direction is negative. What is the ball's velocity (in m/s) when it returns to the level where it left your hand? (Indicate the direction with the sign of your answer.)

Explanation:

(a) For maximum height, the formula will be as follows.

           v^(2) = u^(2) + 2as

                 a = v^(2) - 2gh

or,                 h = (v^(2))/(2g)

                        = ((26)^(2))/(2 * 9.8)

                        = (676)/(19.6)

                        = 34.5 m/s

Hence, it rises 34.5 m/s above the level where it leaves your hand.

(b) Time to reach maximum height is as follows.

            v = u + at

or,           v - gt = 0

                 t = (v)/(g)

                   = (26)/(10)

                   = 2.6 sec

Therefore, it will take 2.6 sec to reach its highest point.

(c)  Time taken by the ball to ascent is equal to the time it has taken to descent.

Therefore, time taken by the ball to return to the level where it left your hand after it reaches its highest point? is also 2.6 sec.

(d)  Speed of the ball will be 26 m/s in the downward direction. Hence, the velocity will be -26 m/s.

Final answer:

When the ball returns to the level where it left your hand, its velocity will be negative.

Explanation:

To determine the ball's velocity when it returns to the level where it left your hand, we need to consider the forces acting on the ball. When the ball is released, it experiences the force of gravity pulling it downwards. As it travels upwards, the force of gravity slows it down until it reaches its maximum height and momentarily stops. Since the upward direction is positive, the ball's velocity will be negative when it returns to the level where it left your hand.

When a ball is thrown upwards, it will eventually succumb to gravity and fall back to the starting position. This is generally known as projectile motion.

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A stack of books is sitting on a table. Which force is pulling downward on it?

Answers

Gravity is the force pulling downward.

Safety belts protect people in cars in the event of an accident because, according to Newton’s laws of motion, when an impact causes the car to suddenly change its motion -A.the speed of the people always increases, since now they have not one but two forces acting on them.
B.the speed of the car always increases, giving it greater force since the mass will remain the same.
C.the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.
D.the people in the car will continue to move in the same direction and at the same speed as before the impact.

Answers

When an impact causes the car to suddenly change its motion, (D) the people in the car will continue to move in the same direction and at the same speed as before the impact.

What is Newton's first law of motion?

Newton's first law of motion states that Unless influenced by an imbalanced force, a body at rest stays at rest, and a body in motion keeps moving in a straight path at a constant pace. This law is commonly known as law of inertia and the resistance of a body to maintain its state of rest is called inertia of rest, same as, the resistance of a body to maintain its state of motion is called inertia of motion.

When a car is moving with certain speed, the car along with the people inside the car is in inertia of motion. In an event of accident, the car comes in rest in no time but the man in the car is still in inertia of motion. So, his body moves forward in the car which may cause injuries. To prevent such injuries, the people inside a car are advised to use safety belts.

So, correct answer  is option (D).

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Answer:

D :)

Explanation:

List five different institutional sources of contracts that you know

Answers

The contract of citizenship, the contract of merriage, the contract of loan, the contract of power, and the contract of health care. All these are examples of a contract on institutional level

What is intertia? Explain.​

Answers

Answer:

Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Hopethisanswerisright!

Answer:

property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.

The demand for your hand-made skateboards, in weekly sales, is q = −3p + 700 if the selling price is $p. You are prepared to supply q = 2p − 500 per week at the price $p. What price should you sell your skateboards for so that there is neither a shortage nor a surplus?

Answers

Answer:

you should sell your skateboards at $240

Explanation:

The price p to sell your skateboards for so that there is neither a shortage nor a surplus is the price that makes equal the quantity of sales and the quantity of supply, so p is equal to:

q (sales) = q (supply)

-3p + 700 = 2p - 500

700 + 500 = 2p + 3p

1200 = 5p

1200/5 = p

$240 = p
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