--Please help!--
Which term is used to describe the height of a wave from its rest position to its crest?

A) Crest height
B) Frequency
C) Amplitude
D) Wavelength

Time before projectile hits wall

= 88.2 m / 29.4 m/s = 3 seconds

Vertical velocity of projectile after three seconds

= 3*9.8 = 29.4 m/s

Horizontal velocity of projectile after three seconds, assuming no air resistance

= 29.4 m/s  (given)

Conclusion:

velocity of projectile when it hits the wall

= < 29.4, -29.4> m/s

= sqrt(29.4^2+29.4^2) m/s east-bound at 45 degrees below horizontal

= 41.58 m/s east-bound at 45 degrees below horizontal.

Final answer:

The projectile's velocity when it strikes the wall is a combination of its initial horizontal velocity and the vertical velocity it gains due to gravity. The horizontal velocity remains constant at 29.4 m/s east, but the final velocity also includes a downward vertical component due to gravity. The exact final velocity would require calculating the vertical component at impact but is not simply 29.4 m/s east.

Explanation:

The question is a classic example of a projectile motion problem in physics, specifically dealing with a projectile launched horizontally. The key concept here is that horizontal motion and vertical motion are independent of each other. Since the projectile is launched horizontally at a speed of 29.4 m/s without any initial vertical component, this speed will not change throughout its flight because horizontal velocity remains constant when neglecting air resistance. The vertical motion of the projectile, however, is influenced by gravity, which causes it to accelerate downwards at 9.8 m/s2.

To find the velocity at the moment it strikes the wall, we need to separately consider the horizontal and vertical components of velocity. The horizontal component remains 29.4 m/s east, as stated. To find the vertical component, we need to calculate the time it takes for the projectile to reach the wall. This is done by dividing the horizontal distance by the horizontal velocity (time = distance / velocity = 88.2 m / 29.4 m/s).

Without calculating the exact time here, it's important to understand that by the time it hits the wall, the projectile has gained a vertical velocity component due to gravity. The final velocity is a vector combination of the horizontal and vertical components. Therefore, the answer is not simply 29.4 m/s east, as that disregards the vertical component. The exact answer would involve calculating the vertical velocity at the time of impact and then combining it with the horizontal velocity to find the magnitude and direction of the final velocity vector. Options A, C, and D involve assumptions or calculations not fully provided here, but the question's premise indicates that the projectile's velocity upon impact is a combination of both horizontal and vertical components.

Pascal's law (also Pascal's principle or the principle of transmission of fluid-pressure) is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.

Answer: The pressure at two pistons within an enclosed fluid system is always the same.

Explanation:

Given:

Time taken for the travel: 40 mins=2400 secs

Velocity: 1.2m/s

Speed and velocity have the same magnitude. Speed is a scalar where as velocity is a vector quantity.

Distance traveled= speed x time.

Distance traveled: 1.2 x 2400=2880m

That would be balanced.

The force he applies on himself is balanced force.

-- reduce the length of a wire to 1/2 . . . cut the resistance in half

-- reduce the diameter to 1/4 . . . reduce the cross-section area by (1/4²) . . . increase the resistance by 16x .

-- R2 = (R1) · (1/2) · (16)  =  8 · R1

-- R2 / R1  =  8

The answer is (C) as

[tex]C (s) + O_2 (g)[/tex] → [tex]CO_2[/tex]

It is commonly known that oxygen has the importance in the combustion reaction and in the absence of this molecule, the no combustion reaction will proceed. SO, for the combustion reaction, it is important that oxygen must be present in the reactant side of the equation than on the product side. Another identity is also present in the combustion reaction as carbon dioxide and water will be present in the product side. In the present options, the oxygen is only present in equation (C) in the reaction side.

So, the right option is

[tex]C (s) + O_2 (g)[/tex] → [tex]CO_2[/tex]

Final answer:

Option C, C (s) + O2 (g) → CO2 (g), is the combustion reaction, which involves the burning of carbon in the presence of oxygen to form carbon dioxide gas.

Explanation:

The student is asking to identify which of the given options is a combustion reaction. A combustion reaction typically involves a substance (usually carbon-based) combusting in the presence of oxygen to form carbon dioxide and water, releasing heat in the process. Among the options given, C. C (s) + O2 (g) → CO2 (g) represents the combustion of carbon (in the form of graphite or diamond), which reacts with oxygen to form carbon dioxide gas. This is a standard example of a combustion reaction.

It's important to note that the other reactions listed, such as combining hydrogen and chlorine to make hydrochloric acid (A), sodium and chlorine to make sodium chloride (B), and the decomposition of calcium carbonate to form calcium oxide and oxygen gas (D), are not combustion reactions.

Answer:

the is answer is Static friction took the test its right.

Explanation:

C. About the same amount of time to hit the floor.

I just took a test with this question and got it right :)

Hope this is helpful.

Option C :- about the same amount of time to hit the floor

Because Mass has no effect on how fast things travel  in free fall situations . If you look at your kinematics equations  none of them consider mass as a variable.

however mass does have effect on energy.

The mass of the baking soda was 80 g

Answer: the mass is 80g

Explanation: In a solution of 140g, we knot that there are 60g of vinegar, the only other component in the solution is baking soda.

Now we want to find the mass of the baking soda in the solution.

Because there are only two components in the solution, if we remove the 60g of vinegar, the residue mass is the mass of the baking soda.

then we need to calculate:

Mass = 140g - 60g = 80g

So the mass of baking soda in the solution is 80g.

Answer:

THE ANSWER IS D

Explanation:

I DID THE TEST

The periodic table on the left separates elements into three groups: the metals (green in the table), nonmetals (orange), and metalloids (blue). Most elements are metals. They are usually shiny, very dense, and only melt at high temperatures.

On the periodic table, representative metals are on the left side, transition metals and inner transition metals are in the centre. Transition metals are found in groups 3-11, while inner transition metals are in the bottom two rows. The reactivity of these metals varies, affecting how they are isolated from ores.

In the periodic table, the metals are generally located on the left side and in the centre. Specifically, representative metals are located on the left side of the table, while transition metals and inner transition metals can be found in the middle. The elements boron, silicon, germanium, arsenic, antimony, and tellurium, known as metalloids or semimetals, act as a divider between metals and nonmetals.

Transition metals are further differentiated as they are located in groups 3-11 of the periodic table and are characterized by their partially filled d orbitals. The inner transition metals are located in the two rows at the bottom of the periodic table, below group 3.

The reactivity of these metal groups varies, from the highly active metals such as scandium and iron, to almost inert elements, like platinum. This variety in reactivity determines the methods used to isolate the elements from their ores, with more active metals being more difficult to reduce.

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Object true weight is given as

[tex]mg = 123 N[/tex]

now we know that g = 9.8 m/s^2

[tex]m* 9.8 = 123 [/tex]

[tex] m = \frac{123}{9.8} = 12.55 kg[/tex]

now when it is complete submerged in water its apparent weight is given as 82 N

apparent weight = weight - buoyancy force

apparent weight = 82 N

weight = 123 N

now we have

82 = 123 - buoyancy force

buoyancy force = 123 - 82 = 41 N

now we also know that buoyancy force is given as

[tex]F_b = p_{liq}Vg[/tex]

[tex]41 = 1000*V*9.8[/tex]

[tex]V = \frac{41}{1000*9.8}[/tex]

[tex]V = 4.18 * 10^{-3} m^3[/tex]

now as we know that mass of the object is 12.55 kg

its volume is 4.18 * 10^-3 m^3

now we know that density will be given as mass per unit volume

[tex]density = \frac{m}{V}[/tex]

[tex]density = \frac{12.55}{4.18*10^{-3}[/tex]

[tex]density = 3002.4 kg/m^3[/tex]

so here density of object is 3002.4 kg/m^3

Answer:

3000 kg/m^3

Explanation:

True weight = weight in air = 123 N

Apparent weight = weight in water = 82 N

Loss in weight of the object = true weight - apparent weight

Loss in weight = 123 - 82 = 41 N

According to the Archimedes principle, the loss in weight of the object is equal to the buoyant force acting on the object.

Let V be the volume of the object an d be the density of the object.

Buoyant force = volume of the object x density of water x gravity

41 = V x 1000 x g

[tex]V = \frac{41}{1000 g}[/tex]       .... (1)

Now, true weight = Volume of the object x density of object x gravity

[tex]123 = \frac{41}{1000 g} \times d\times g[/tex]      from (1)

d = 3000 kg/m^3

(D) decreases, inverse

Average speed of a body is defined as the ratio of the distance traveled to the time taken to travel the distance. The runner runs the same distance  of 400 m during each lap but takes 5 seconds more for each lap.

Since [tex]v_a_v_g=\frac{d}{t}[/tex], as time increases, the average speed for each lap increases.

Thus, [tex]v\alpha \frac{1}{t}[/tex] when the distance traveled is the same. This is an example of an inverse proportionality relationship.

The primary energy exhibited is:

friction:  Heat energy

Due to friction. there is heat loss in mostly all machines.

nuclear power plant:  Nuclear energy

In nuclear power plant, fission or fusion of radio-active substances produces large amount of nuclear energy.

toaster element:  Heat energy

Heat energy is produced in the toaster when electricity passes through the element. This is used to heat the toasts.

welding torch:  Heat energy

The heat energy produced in the welding torch is used in welding.

eraser sitting on a desk edge:  Potential energy

Potential energy is possessed by a body due to virtue of its height.

light bulb:  Heat energy and light energy.

The element inside the bulb gets heated first and then light energy is produced.

campfire:  Heat energy

Heat is produced and then light energy in case of campfire.

moving car:  Kinetic energy

A moving body has kinetic energy.

lump of coal in a storage bin:  Potential energy

A lump of coal in a storage bin has potential energy.

stick of TNT: potential energy

Stick of TNT is formed of explosive mixture. It contains potential energy.

Answer:

• Friction ( heat )

• Nuclear power plant ( nuclear )

• Toaster element ( heat )

• welding torch ( heat )

• eraser sitting on a desk edge (potential)

• light bulb ( light )

• campfire ( heat )

• moving car ( kinetic )

• lump of coal in a storage bin ( potential )

• stick of tent ( potential)

Explanation: hope this helps !

acceleration = change in velocity/change in time

so...

a = 20 m/s / 2 seconds

a = 10

hope that helps :)

P.S. found this from Brainly User, sometimes all you have to do is search to find the answer.

The "waning gibbous" begins immediately after the Full Moon and lasts about a week.

At the end of the week, the moon is no longer gibbous, but it's still waning.  At the instant it's exactly half-illuminated, it's called "Third Quarter", and then it continuous to wane for another week.

So 3 to 4 days after the END of the waning gibbous phase, it's a Waning Crescent. It still has another 3 to 4 days of waning to go, before it wanes away to nothing and we have the next New Moon.

The waning gibbous phase is the phase between the full and last quarter moon late at night or in the early morning . The waning crescent is the phase that occurs 3-4 days later a waning gibbous.

The waning gibbous phase is the phase between the full and last quarter moon late at night or in the early morning.

The waning gibbous phase moon appears more than half-lighted but less than the full moon. A full sunset is a time when the full moon rises. The rising time of the waning gibbous moon is late at night.

It looks red like a  full moon when it’s near the horizon.

To learn more about the waning gibbous refer to the link ;

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Given:

u(initial velocity)=0

v(final velocity)= 10 m/s

t= 4 sec

Now we know that

v= u + at

Where v is the final velocity

u is the initial velocity

a is the acceleration measured in m/s^2

t is the time measured in sec

10=0+ax4

a=10/4

a=2.5 m/s^2

First write down all the known variables:

d = -1.1m

a = -9.8m/s^2

vi = 0m/s

t = ?

Now use the kinematic equation that relates all the variables:

d = vi*t + (1/2)at^2

(-1.1) = (0)t + (1/2)(-9.8)t^2

-1.1 = -4.9t^2

0.22445 = t^2

0.47s = t

It takes 0.47 seconds for the juice to reach the ground.

To convert a quantity in kilograms to pounds, you simply multiply by 2.2 lb/kg.

(7 kg)(2.2 lb/kg) = 15.4 lb.

Final answer:

A 7.0 kilogram bowling ball on Earth's surface weighs approximately 15.4 pounds, calculated using the conversion factor where 1 pound is equivalent to 0.4536 kilograms.

Explanation:

To convert the mass of a 7.0 kilogram bowling ball to its weight in pounds on Earth's surface, we utilize the fact that 1 pound (lb) is equivalent to 0.4536 kilograms (kg) on Earth.

The conversion from kilograms to pounds can be calculated using the ratio method:

Therefore, for a 7.0 kg bowling ball:

Thus, a bowling ball with a mass of 7.0 kg on Earth's surface has an approximate weight of 15.4 pounds.

Answer:

B. a ball on a string that stopped at the top of a vertical loop

Explanation:

Motion diagram must represent the direction of velocity of an object in the given figure

here as it is shown in the figure the arrow is vertically downwards which means that the velocity of object at that moment is downwards when it is at the top most point of its circular path

So here

A. a car driving over the top of a hill

Not correct as car is moving tangentially on the top of the hill so its velocity can not be downwards

B. a ball on a string that stopped at the top of a vertical loop

Since ball is stopped at the top most point of its path so here its velocity must be downwards due to free fall so its correct motion diagram for the above condition.

C. a roller coaster car at the top of a vertical loop of a track

Not correct as we know that roller coaster at the top of the loop will move tangentially so its velocity can not be vertically downwards.

D. a bug on the top of a rolling hula hoop

Bug is at the top of rolling hula hoop so its velocity is again tangentially and not vertical downwards.

The answer is C because only the bottom has the water pressure applied to it because it's the only thing emersed in the water.

The pressure on a brick that is totally immersed in water, with the long edge of the brick vertical is: C. greatest on the bottom of the brick.

Pressure can be defined as a measure of the external force acting upon a surface area. Mathematically, the pressure acting on an area is given by the formula:

[tex]Pressure = \frac{Force}{Area}[/tex]

In this scenario, the pressure on the brick with a long, vertical edge, that is totally immersed in water is greatest on its bottom because the long, vertical edge displaces water.

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Answer:

   The minimum length for the slip road = 100 meter.

Explanation:

We have equation of motion, [tex]v^2=u^2+2as[/tex], where u is the initial velocity, u is the final velocity, s is the displacement and a is the acceleration.

 In this case initial velocity = 10 m/s, final velocity = 30 m/s and acceleration = [tex]4m/s^2[/tex], we need to find displacement.

 Substituting

     [tex]30^2=10^2+2*4*s\\ \\ 800=8s\\ \\ s=100meter[/tex]

  The minimum length for the slip road = 100 meter.

Given:

v(final velocity)= 7.5 m/s

t(time taken to pedal along)=4.5 s

Displacement (s)=19 m

Now we know that

s=ut+1/2(at^2)

Where s is the displacement measured in m

u is the initial velocity measured in m/sec

a is the acceleration measured in m/s^2.

t is the time taken to cover this distance.

Substituting the given values in the above formula we get

19= 4.5u+1/2(a x 4.5 x 4.5)

20.25 a + 9 u = 38

Now we also know that

v= u + at

Substituting the given values in the above formula we get

7.5= u + 4.5a

Solving for u and a from the above equations we get

u = 0.944m/s

a= 1.45 m/s^2

Thus the initial velocity is 0.944 m/s

mass of car =700kg

Required acceleration =5m/s^2

According to newton's second law

F=ma

F=(700)(5)

F=3500 Kgm/sec^2

Answer:3500

Explanation: mass of car =700 kg

Required acceleration =5 m/s^2

According to newton's second law

F=ma

F=(700)(5)

F=3500 K gm/sec^2

time for which Jill and Scott both traveled is 30 min

as we know that

1 hour = 60 min

now we will convert the time of travel from minutes to hour

[tex]t = \frac{30 min}{60 min}* 1 hour[/tex]

[tex]t  = 0.5 hour[/tex]

now we will have to find the speed of both

For speed we know the formula

[tex]speed = \frac{distance}{time}[/tex]

speed of Jill as he cover 5 km in 30 min

[tex]v_1 = \frac{5}{0.5} = 10 km/h[/tex]

speed of Scott as he cover 10 km in 30 min

[tex]v_2 = \frac{10}{0.5}= 20 km/h[/tex]

so correct answer is

A)Scott had the faster speed since he rode at 20 k/h while Jill only traveled 10 km/h.

Speed of Jill is greater than Scott

As we know that

Speed = Distance / Time

So speed of Jill is = 5 / 0.5     since 30 minutes = 0.5 hours

Speed of Jill = 10 km/hour

And

speed of Scott is = 10 / 0.5    

Speed of Scott = 20 km/min

Here we can see that speed of Scott is greater than Jill

i think its 200 i hope that helps

Answer:

78.1 m/s

Just took it.

Explanation:

Answer:

analyzing what data means

diagram showing the correlation between two quantities

Explanation:

Graph is the plot of two physical quantities and it describes the relation between both quantities. It gives a specific relation between the two physical quantities which is used to analyze the result.

Thus, the following options are correct,

analyzing what data means

diagram showing the correlation between two quantities

Answer: Analyzing what data means, diagram showing the correlation between two quantities, and predicting outcomes and patterns.

The first, third, and forth.

A scientist treats a cell with a chemical that destroys the chloroplast. As a result, photosynthesis will be stopped.

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

The process begins with proteins absorbing light energy  which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.

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Tension in the rope due to applied force will be given as

[tex]F = 142 N[/tex]

angle of applied force with horizontal is 37 degree

displacement along the floor = 6.1 m

so here we can use the formula of work done

[tex]W = F d cos\theta[/tex]

now we can plug in all values above

[tex]W = 142 * 6.1 * cos37[/tex]

[tex]W = 691.8 J[/tex]

So here work done to pull is given by 691.8 J