A ball is thrown horizontally from the top of
a building 51 m high. The ball strikes the
ground at a point 120 m from the base of the
building.
The acceleration of gravity is 9.8 m/s
2
.
Find the time the ball is in motion.
Answer in units of s.
If the time the ball is in motion is 3.22617 s
Find the initial velocity of the ball.
Answer in units of m/s.

Answer:

if one bulb burns out the other bulbs will also turn off because they are connected to each other.

Answer:

Radio waves

Explanation:

Answer:

Below

Explanation:

135 lbs  *  1 kg/2.2 lb  = ~ 61.4 kg

there are 1000 mg in each gram

5.3 mg   *  1 gm / 1000 mg = .0053 g

Answer:

The correct option is B.

Tissue paper

Explanation:

Tissue paper absorb most sound waves because it is porous. Materials that absorb sound most are highly porous like tissue because that have pores and allow sound to penetrate through it channels or cavities which makes it to loss part or all of it energy. This material allow sound wave to enter through it.

Sound energy is distributed as a result of heat loss which is caused by the air molecules of the pores wall in the material.

Answer:

Option A: Earplugs is your answer.

Explanation:

Merry Christmas

Answer:

An atom of fluorine has the atomic number 9, and its mass number is 19 amu. Which of the following shows a neutral atom of fluorine? 16 protons and 14 electrons.

Explanation:

ITs 16 protins and 14 ELECTRONS

Answer:

Answer is 9 Protons, 10 Neutrons, and 9 Electrons

Explanation:

A.P.E.X

Answer:

the initial force exerted on the rocket is 900 N

Explanation:

The computation of the initial force exterted on the rocket is shown below:

Force exerter = Rate of change of momentum

= 300 m/s × 3kg/s

= 900 N

hence, the initial force exerted on the rocket is 900 N

we simply multiplied the rate with its speed so that the force could come

Answer:

C. 199.9 s

Explanation:

3 minutes = 3×60 = 180 seconds.

the turtle moves in that time 180×10 = 1800 cm.

in other words the rabbit gave it that much head-start (it does not matter if that was at the begin of in the middle of the race).

the rabbit moves with 10×10cm/s = 100cm/s.

the rabbit needs therefore 1800/100 = 18 seconds for the

1800 cm.

at that time the turtle has added another 18×10 = 180 cm.

for which the rabbit needs 180/100 = 1.8 seconds.

during that time the turtle has added 1.8×10 = 18 cm.

and so on.

in formal mathematics this looks like this :

1800 + 10x = 100x

after x seconds of the rabbit running both will have run the same distance, and it is a tie.

1800 = 90x

x = 20 seconds

so, at that point, the rabbit was actively running for 20 seconds and raced 20×100 = 2000 cm

and the turtle was actively running for 180 + 20 = 200 seconds, and also covered 200×10 = 2000 cm.

but our question tells us that the turtle won by 10 cm.

so, the race was over a little bit before these 200 seconds (for a tie).

this means, the rabbit could not run the last 10 cm for the tie (because the race was over and the turtle had won).

the rabbit would have needed 10/100 seconds for these 10 cm.

as speed = distance/time

we need to divide distance by speed

distance/1 / distance/time

to get time.

so,

10cm/1 / 100cm/s = 10s/100 = 1/10 s

so, we need to deduct this 1/10 s from the 200 seconds of the turtle (and also from the 20 seconds for the rabbit).

the race lasted of course the whole time the turtle was running (while the rabbit was resting, officially still participating in the race with speed 0 for 3 minutes).

and so, the race was 199.9 s long.

Answer:

A increases

Explanation:

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The main-sequence lifetime for stars like the sun is approximately 10 billion years. This is the length of time that a star will spend fusing hydrogen into helium in its core. The rate of fusion reactions is determined by the star's mass, with more massive stars having shorter main-sequence lifetimes.

During this phase, the star is in a state of hydrostatic equilibrium, where the outward pressure from nuclear fusion is balanced by the inward gravitational force. As the star nears the end of its main-sequence lifetime, it will begin to evolve into a red giant, expanding and cooling as its hydrogen fuel is depleted.

The exact duration of a star's main-sequence lifetime is an important factor in determining its overall lifespan and ultimate fate, whether it will eventually become a white dwarf, neutron star, or black hole.

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A train travels 8.81m/s in a -51.0 degree direction, the train accelerates for 2.23s, changing its velocity to 9.66m/s in a 37.0 degree direction. The displacement of the train after 2.23 seconds is 25.4 m.

When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.

Resultant velocity of the train,

The resultant velocity of the train is calculated as follows;

R² = vi² + vf² - 2vivf cos(θ)

where,

θ is the angle between the velocity = (90 - 51) + 37 = 76⁰

R² = 8.81² + 9.66² - 2(8.81 x 9.66) cos(76)

R² = 129.75

R = √129.75

R = 11.39 m/s

The displacement of the train is the change in position of the train after a given period of time.

The displacement is calculated as follows;

Δx = vt

Δx = 11.39 m/s x 2.23 s

Δx = 25.4 m

Thus, the displacement of the train after 2.23 seconds is 25.4 m.

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Explanation:

1. swimmer is having kinetic energy as it is moving with velocity of 6 meter per second..

2. Intial velocity = 6 , Final velocity = 0

Average velocity = u +v /2

6+0/2 = 6/2 = 3

So, 3 is velocity

Kinetic energy = ½ mv²

= ½× 80 × (3)²

= 40×9

= 360 Joule Answer

Answer:

Gut flora

Explanation:

The minimum distance 'd' between the cars to avoid a collision is either 45 feet if Car B stops instantly or 645 feet if Car B takes 10 seconds to come to a stop after the driver applies the brakes.

To determine the minimum distance 'd' between the cars to avoid a collision, we need to consider the time it takes for both cars to come to a stop after the driver of Car B applies the brakes.

1. Car B:

  - Initial velocity: 60 ft/s

  - Deceleration: -12 ft/s² (negative because it's decelerating)

  - Time to come to a stop: Unknown, denoted as 'tB'

2. Car A:

  - Initial velocity: 60 ft/s

  - Deceleration: -15 ft/s^2 (negative because it's decelerating)

  - Reaction time: 0.75 s

  - Time to come to a stop: 'tB' + Reaction time

Since both cars come to a stop, we can equate their respective distances traveled to zero using the kinematic equation:

Distance = Initial velocity × Time + 0.5 × Acceleration × Time²

For Car B:

0 = 60 ft/s × tB + 0.5 × (-12 ft/s²) × tB²

Simplifying this equation will give us the time 'tB' for Car B to come to a stop.

For Car A:

0 = 60 ft/s × (tB + 0.75 s) + 0.5 × (-15 ft/s²) × (tB + 0.75 s)²

Simplifying this equation will give us the total time for Car A to come to a stop.

To find the minimum distance 'd' between the cars, we need to determine the value of 'd' when both cars come to a stop simultaneously. This occurs when the total time for Car A to stop is equal to 'tB'. Substitute this value into the equation:

d = 60 ft/s × (tB + 0.75 s)

0 = 60tB - 6tB²

This is a quadratic equation in terms of 'tB'. Rearranging the equation:

6tB² - 60tB = 0

Factor out a common term of 6tB:

6tB(tB - 10) = 0

This equation will be satisfied when either 6tB = 0 or tB - 10 = 0:

1) 6tB = 0

  tB = 0

2) tB - 10 = 0

  tB = 10

We have two possible solutions for 'tB': tB = 0 and tB = 10.

Now let's substitute these values into the equation for 'd' to find the minimum distance:

For tB = 0:

d = 60 ft/s × (0 + 0.75 s) = 45 ft

For tB = 10:

d = 60 ft/s × (10 + 0.75 s) = 645 ft

Therefore, the minimum distance 'd' between the cars to avoid a collision is 45 feet when Car B stops instantly, or 645 feet when Car B takes 10 seconds to stop.

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Given:

The mass of the automobile is

To find:

The weight of the car in N and its mass in kg

Explanation:

We know,

So, the mass of the automobile is

Answer:

2/3.or 0,67

Explanation:

acceleration = Result or sum of force / the mass

a = F/m

a = (35-25)/15

a = 10/15 = 2/3 m/s²

a = 0,67 m/s²

Answer:

speed is the rate of change in distance thus it is scalar physical quantity

while velocity is the rate of change in displacement thus it is a vector physical quantity

Explanation:

vector physical quantity: is a quantity that requires both magnitude and direction to identify

scalar quantity: requires only magnitude to identify.

Answer:

Explanation:

Statement A: Increasing a moving average window will enhance noise dampening.

Statement B: Decreasing a moving average window will enhance impulse response.

Statement C: Increasing the smoothing constant in exponential smoothing will enhance impulse response.

Statement D: Decreasing the smoothing constant in exponential smoothing will enhance noise dampening.

Let's evaluate each statement:

A. Increasing a moving average window will enhance noise dampening.

This statement is true. Increasing the window size of a moving average smooths out the fluctuations in the data and reduces the effect of noise, thus enhancing noise dampening.

B. Decreasing a moving average window will enhance impulse response.

This statement is false. Decreasing the window size of a moving average reduces the number of data points considered, leading to less smoothing and a faster response to changes in the data. It does not enhance impulse response.

C. Increasing the smoothing constant in exponential smoothing will enhance impulse response.

This statement is false. Increasing the smoothing constant in exponential smoothing increases the weight given to more recent data points, which results in smoother and more stable forecasts. It does not enhance impulse response.

D. Decreasing the smoothing constant in exponential smoothing will enhance noise dampening.

This statement is true. Decreasing the smoothing constant in exponential smoothing gives more weight to past observations, which helps in reducing the impact of noise and enhances noise dampening.

Based on the evaluation, 2 out of the 4 statements are correct.

The base flat power expected to begin a 300 is 2220N

Mass of steel block is 300kg

Weight = 300 x 9.81 = 2943N

Coefficient of Contact for steel of steel (static) = .74.74 x 2943 = 2,177.82

The meaning of "force" is clear. It's fine to refer to a force of this magnitude as either a push or a pull. An object is neither "existing in" nor "contained" by a force. Something can be put under pressure by another force.

The term "force" is used to describe an external force that changes the state of a body. When force is applied to the body, its shape, size, and direction can change.

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The type of gas that comes from reservoirs with very little or no crude oil is non-associated gas.

Non-associated gas, also known as dry gas or free gas, is natural gas found in underground reservoirs that are not associated with significant amounts of crude oil. These reservoirs primarily contain natural gas, which is composed mainly of methane (CH4) along with small amounts of other hydrocarbons.

Unlike associated gas, which is found in reservoirs along with significant amounts of crude oil, non-associated gas reservoirs have minimal or negligible amounts of crude oil. Non-associated gas reservoirs are formed through geological processes that trap and store natural gas independently from oil deposits.

Non-associated gas plays a vital role as an energy source and is used for various purposes, including electricity generation, heating, cooking, and industrial applications. It is typically extracted through drilling and production techniques specific to natural gas reservoirs.

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A kinetic friction simply means the force that is in the opposite direction to the body's movement.

Your information is incomplete. Therefore, an overview of kinetic friction will be given. Kinetic friction simply means an inhibitory force that's present when an object begins to move.

In this case, a kinetic friction simply means the force that is in the opposite direction to the body's movement that slides with respect to the surface.

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Spectral features that allow the differentiation of the product from the starting material can be identified using various techniques such as infrared spectroscopy and nuclear magnetic resonance spectroscopy.

The chemical structure of a substance determines its spectral features, making it possible to differentiate it from other substances. Spectroscopic techniques like nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy can be used to identify different types of molecular bonds, enabling the differentiation of different types of chemicals.NMR spectroscopy enables the determination of the types of atoms in a substance by analyzing the radiation emitted by the nucleus of the atom. On the other hand, IR spectroscopy identifies the types of chemical bonds in a substance by analyzing the infrared radiation absorbed by the sample.

Spectral features that differentiate the product from the starting material can be identified using various techniques such as infrared spectroscopy and nuclear magnetic resonance spectroscopy. NMR spectroscopy can determine the types of atoms in a substance by analyzing the radiation emitted by the nucleus of the atom, while IR spectroscopy can identify the types of chemical bonds in a substance by analyzing the infrared radiation absorbed by the sample. The chemical structure of a substance determines its spectral features, enabling its differentiation from other substances.

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The current through the wire segment is determined by the right-hand rule, while the force exerted is determined by the left-hand rule.

The direction of the current through the wire segment nearest the magnet can be determined using the right-hand rule. If we point our right thumb in the direction of the magnetic field created by the magnet, and then curl our fingers around the wire, the direction in which our fingers curl represents the direction of the current. The specific direction will depend on the orientation of the magnet's poles and the wire.

The direction of the force exerted by the magnet on the wire segment can be determined using the left-hand rule. If we extend our left hand, with the thumb pointing in the direction of the current flowing through the wire, and the fingers pointing in the direction of the magnetic field created by the magnet, the palm of our hand will indicate the direction of the force.

The force exerted by the magnet on the wire segment will be perpendicular to both the current and the magnetic field, and its specific direction will depend on the orientation of the magnet's poles and the wire.

It's important to note that the specific directions will vary depending on the orientation and configuration of the magnet and the wire in the given setup.

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Velocity, acceleration, force, and displacement, have magnitude and direction (ie vector quantity) in common

This is a which have both magnitude and direction. Example include:

This is a quantity which has magnitude but no direction. Example include:

From the above, we can see that velocity, acceleration, force, and displacement, have magnitude and direction (ie vector quantity) in common

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Answer:

Newton's Cradle works on the principle of Conservation of momentum

Explanation:

Newtons Cradle works on the principle of Conservation of Momentum, which states that when Collision happens between two or more bodies their Momenta remain conserved that is they remain same before and after collision.

m1*v1 = m2*v2

where m1 and m2 are the masses of the bodies and v1 and v2 are their velocity with which they are travelling.

Considering the case of Newton's Cradle, when a ball on the Left end is lifted to a height and then it is released so it imparts its momentum on the next ball, it seems that all the middle balls remain stationery but what actually happens is that their individual momenta are being transferred from on ball to the other.

Also when this momentum reaches to ball on the right there is no next ball therefore the ball on the rightmost position moves to nearly the same height as the one which was lifted on the left side.

One may note that whenever we lift one ball from any end, the same number of ball will be lifted from the other end. Like if we have lifted two balls from left end so two balls from the rightmost position will be lifted.  

Answer:

a black or dark viscous substance obtained as a residue in the distillation of organic materials and especially tars

Explanation:

Answer:

Explanation

The most famous and common example is Christmas tree lights. You can't tell easily by looking at them whether they are in series or parallel. But you sure know the difference when one of them burns out. When that happens, the whole string goes dead. No matter what you do (other than find out which bulb burned out) will not fix the problem.

Another example is anything that is temperature controlled. For example a furnace is controlled by a thermostat. When the room temperature reaches a certain point, the thermostat is constructed in a certain way so that it forms an open circuit and no current can flow through it. The furnace motor turns off and the furnace stops pumping hot air into a room.

Answer:

Joule is the name of the unit that are normally used to measure energy

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 3.75 g

volume = final volume of water - initial volume of water

volume = 28 - 25 = 3 mL

We have

\(density = \frac{3.75}{3} \\ \)

We have the final answer as

Hope this helps you