PHYSICS HIGH SCHOOL

Which term describes the time it takes for an object to complete one full cycle of motion on a spring?

Answers

Answer 1

Answer:

The term period (symbol: T) describes the time it takes for an object to complete one full cycle of motion on a spring.

The formula for time is: T = 1 / f , where f is the frequency , f= c / λ = wave speed c (m/s) / wavelength λ (m)..

The formula describes that as the frequency of a wave increases, the time period of the wave decreases.

Answer 2

Answer:

There is no correct choice on the list you provided.

That time is called the "period" of the motion

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Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

Answers

Answer

To understand this concept it is necessary to understand Newton's Second Law

According to Newtons Second law applied force is equal to rate of change of momentum of a body.

Mathematically,

$F=(dp)/(dt)$

here, $(dp)/(dt)$ is rate of change of momentum with respect to time

It means If two eggs fall from same height,one on softer surface and other on hard surface that time the momentum of both eggs will remain equal at both the surfaces. But, impact time will be different. On hard surface egg will stop almost instantly so impact time will be small and hence the force on egg will be large therefore the egg will breakup.

On the other hand on the soft surface like a cotton, egg will not stop instantly but it will slow down for a few seconds and then stop due to which the time of impact will increase. Therefore the force on egg will be less and it won't break up.

I have three questions. John has to hit a bottle with a ball to win a prize. He throws a 0.4 kg ball with a velocity of 18 m/s. It hits a 0.2 kg bottle, and the bottle flies forward at 25 m/s. How fast is the ball traveling after hitting the bottle? 2. Someone fires a 0.04 kg bullet at a block of wood that has a mass of 0.5 kg. (The block of woof is sitting on a frictionless surface, so it moves freely when the bullet hits it). The wood block is initially at rest. The bullet is traveling 300 m/s when it hits the wood block and sticks inside it. Now the bullet and the woof block move together as one object. How fast are they traveling?

3. A big league hitter attacks a fastball. The ball has a mass of 0.16 kg. It is pitched at 38 m/s. After the player hits the ball, it is now traveling 44 m/s in the opposite direction. The impact lasted 0.002 seconds. How big of a force did the ballplayer put on that ball?

Answers

1. 5.5 m/s

We can solve the problem by applying the law of conservation of momentum. The total momentum before the collision must be equal to the total momentum after the collision, so we have:

$m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2$

where

m1 = 0.4 kg is the mass of the ball

u1 = 18 m/s is the initial velocity of the ball

m2 = 0.2 kg is the mass of the bottle

u2 = 0 is the initial velocity of the bottle (which is initially at rest)

v1 = ? is the final velocity of the ball

v2 = 25 m/s is the final velocity of the bottle

Substituting and re-arranging the equation, we can find the final velocity of the ball:

$v_1 = (m_1 u_1 - m_2 v_2)/(m_1)=((0.4 kg)(18m/s)-(0.2 kg)(25 m/s))/(0.4 kg)=5.5 m/s$

2. 22.2 m/s

We can solve the problem again by using the law of conservation of momentum; the only difference in this case is that the bullet and the block, after the collision, travel together at the same speed v. So we can write:

$m_1 u_1 + m_2 u_2 = (m_1 +m_2) v$

where

m1 = 0.04 kg is the mass of the bullet

u1 = 300 m/s is the initial velocity of the bullet

m2 = 0.5 kg is the mass of the block

u2 = 0 is the initial velocity of the block (which is initially at rest)

v = ? is the final velocity of the bullet+block, which stick and travel together

Substituting and re-arranging the equation, we can find the final velocity of bullet+block:

$(m_1 u_1)/(m_1 +m_2)=((0.04 kg)(300 m/s))/(0.04 kg+0.5 kg)=22.2 m/s$

3. 6560 N

The impulse exerted on the ball is equal to its change in momentum:

$I=\Delta p$ (1)

The impulse can be rewritten as product between force and time of collision:

$I=F \Delta t$

while the change in momentum of the ball is equal to the product between its mass and the change in velocity:

$\Delta p = m\Delta v = m(v_f -v_i)$

So, eq.(1) becomes

$F \Delta t = m(v_f -v_i)$

where:

F = ? is the unknown force

$\Delta t = 0.002 s$ is the duration of the impact

m = 0.16 kg is the mass of the ball

$v_f = 44 m/s$ is the final velocity of the ball

$v_i = -38 m/s$ is its initial velocity (we must add a negative sign, since it is in opposite direction to the final velocity)

So, by using the equation, we can find the force:

$F=(m (v_f -v_i))/(\Delta t)=((0.16 kg)(44 m/s-(-38 m/s)))/(0.002 s)=6560 N$

The average distance from the sun to Pluto is approximately 6.10 time 10^9 km. How long does it take light from the sun (384,000 km/s) to reach Pluto?

Answers

From the information as given in the question, the transit time
for light from the sun would be

   (6.1 x 10⁹ km) / (3.84 x 10³ km/sec) = 15,885 seconds (rounded).
   (4.4 hours) .
==============================

-- A better figure for Pluto's average distance from the sun is 5.874 x 10⁹ km.

-- " 384,000 km/sec " is about 28% too high for the speed of light.
    A much better figure is 300,000 km/sec.

Using these numbers, the transit time is

   (5.874 x 10⁹ km) / (3 x 10⁵ km/sec) = 19,580 seconds
   (5.4 hours)

State the principle of transmission of pressure in liquids

Answers

Answer:

Pascal's law or the Principle of transmission of fluid-pressure states that "pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure ratio (initial difference) remains the same."

Explanation:

The smallest group of particles in a crystal that retains the shape of the crystal is called the

Answers

Answer:

Unit Cell

Explanation:

A unit cell is the smallest fundamental particle of a crystal structure that represents the structure of a crystal.

Long-range, three-dimensional repetitiveness of this unit cell forms a crystal. A unit cell is composed of ions or atoms in a particular arrangement forming a well-defined structure.

Crystal have a sharp melting and boiling point and when cut using a tool, they give a sharp edge on the pieces.

What types of telescope use a mirror to bring light to focus?

Answers

A reflecting telescope uses a series of curved mirrors to bring light to focus.

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