i need help on this question.

Answer:

A. 10.84 m/s

B. 1.56 s

Explanation:

From the question given above, the following data were obtained:

Angle of projection (θ) = 45°

Maximum height (H) = 3 m

Acceleration due to gravity (g) = 9.8 m/s²

Velocity of projection (u) =?

Time (T) taken to hit the ground again =?

A. Determination of the velocity of projection.

Angle of projection (θ) = 45°

Maximum height (H) = 3 m

Acceleration due to gravity (g) = 9.8 m/s²

Velocity of projection (u) =?

H = u²Sine²θ / 2g

3 = u²(Sine 45)² / 2 × 9.8

3 = u²(0.7071)² / 19.6

Cross multiply

3 × 19.6 = u²(0.7071)²

58.8 = u²(0.7071)²

Divide both side by (0.7071)²

u² = 58.8 / (0.7071)²

u² = 117.60

Take the square root of both side

u = √117.60

u = 10.84 m/s

Therefore, the velocity of projection is 10.84 m/s.

B. Determination of the time taken to hit the ground again.

Angle of projection (θ) = 45°

Velocity of projection (u) = 10.84 m/s

Time (T) taken to hit the ground again =?

T = 2uSine θ /g

T = 2 × 10.84 × Sine 45 / 9.8

T = 21.68 × 0.7071 / 9.8

T = 1.56 s

Therefore, the time taken to hit the ground again is 1.56 s.

Answer: The correct option is C (The committee who insures ethical treatment of research participants)

Explanation:

The institute Review Board ( IRB) is a committee that reviews research that involves human beings and approves it once it's of ethical standard. This committee is usually made up of scholars that arefrom various departments who are mandated to review proposals to ensure that they comply with ethical guidelines and write a summary of proposed risks to subjects.

The primary importance of institute Review board is to protect the rights and welfare of human research subjects and to ensure that appropriate steps are taken to protect the rights and welfare of humans participating as subjects in the research, both in advance and by periodic review,

Answer:

5 cm

Explanation:

Answer:

Use the AU formula

Explanation:

1 astronomical unit = 149597871 kilometer

Answer:

pressure in cylinder A must be one third of pressure in cylinder B

Explanation:

We are told that the temperature and quantity of the gases in the 2 cylinders are same.

Thus, number of moles and temperature will be the same for both cylinders.

To this effect we will use the formula for ideal gas equation which is;

PV = nRT

Where;

P is prrssure

V is volume

n is number of moles

T is temperature

R is gas constant

We are told that Cylinder A has three times the volume of cylinder .

Thus;

V_a = 3V_b

For cylinder A;

Pressure = P_a

Volume = 3V_b

Number of moles = n

Thus;

P_a × 3V_b = nRT

For cylinder B;

Pressure = P_b

Volume = V_b

Number of moles = n

Thus,

P_b × V_b = nRT

Combining the equations for both cylinders, we have;

P_a × 3V_b = P_b × V_b

V_b will cancel out to give;

3P_a = P_b

Divide both sides by 3 to get;

P_a = ⅓P_b

Thus, pressure in cylinder A must be one third of pressure in cylinder B

Answer: 20 N

Explanation: Net force is the sum of all forces acting on an object. For example, in a tag of war, when one team is pulling the tag with a force of 100 N and the other with 80 N, the net force would be 20 N at the direction of the first team (100 N - 80 N = 20 N).

Answer:

0.433 s

Explanation:

Let's break the projectile motion into its horizontal and vertical components:

Horizontal component (x):

Vertical component (y):

We want to find the time required for the hurdler to travel a distance of 0.635 m. In order words, his displacement should be 0.635 m in the x-direction.

Since we don't have the final velocity, we can use this constant acceleration equation:

We have three known variables and want to solve for t. Using this equation in the x-direction, we have:

Substitute these values into the equation.

Simplify the equation.

Divide both sides by the horizontal component of the initial velocity.

Since we start with 3 sig figs, we will round this value to 0.433. The time it takes to clear the hurdle is 0.433 seconds.

Answer:

Explanation:

from the question we are told that

Load [tex]L=15kg[/tex]

Force[tex]F=70N[/tex]

Angle of inclination [tex]=20.0 degres[/tex]

Displacement [tex]m=5 meters[/tex]

coefficient of kinetic friction [tex]\alpha =0.300[/tex]

Answer:

1. Nuclear fusion does not generate radioactive nuclear wastes as nuclear fission does.

2. Nuclear fusion cannot lead to disastrous powerplant explosions as nuclear fission does.

3. More energy is generated during nuclear fusion than in nuclear fission.

Explanation:

Nuclear fusion involves the combination of lighter atoms such as hydrogen to form a heavier nucleus, in the process producing a tremendous amount of energy.

Nuclear fission on the other hand involves splitting a heavy nucleus into two lighter nuclei, releasing energy in the process.

Nuclear fusion and fission release a tremendous amount of energy using radioactive material as a fuel.

Nuclear fusion is a reaction that occurs when two nuclei merge to form a larger nucleus and release a massive quantity of energy.

The breaking of two nuclei into smaller nuclei is known as nuclear fission. Nuclear fission also releases a significant amount of energy.

The key is how tightly the nucleons in a nucleus are bound together. The surplus energy will be released if a nuclear reaction produces nuclei that are more closely bonded than the originals. The most securely bound atomic nuclei are found to be around the size of iron-56. Thus,

When a nucleus significantly larger than iron is broken into tiny bits, energy is released since the smaller fragments have lower energy.

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Answer:

c

Explanation:

Answer:

The speed of the stream is 6 km/h and the speed of the swimmers in still water is 14 Km/h

Explanation:

Relative Speeds

When swimming downstream, the velocity (speed, really) of the stream (Vs) and the speed of the swimmers (Vm) are collaborative. When swimming upstream the speed of the stream subtracts to the speed of the swimmers, thus:

Vm + Vs = 20

Vm - Vs = 8

Adding both equations:

2Vm = 28

Vm = 28/2 = 14

From the first equation:

Vs = 20 - Vm = 20 - 14 = 6

The speed of the stream is 6 km/h and the speed of the swimmers in still water is 14 Km/h

Answer:

The value is [tex]\Delta \phi = 4.12 \ rad[/tex]

Explanation:

From the question we are told that

    The frequency of each sound is  [tex]f_1 = f_2 = f = 540 \ Hz[/tex]

      The speed of the sounds is  [tex]v = 330 \ m/s[/tex]

       The  distance of the first source from the point considered is  [tex]a = 4.40 \ m[/tex]

        The distance of the second source from the point considered is  [tex]b = 4.00 \ m[/tex]

Generally the phase angle made by the first sound wave at the considered point is mathematically represented as

           [tex]\phi_a = 2 \pi [\frac{a}{\lambda} + ft][/tex]

Generally the phase angle made by the first sound wave at the considered point is mathematically represented as

           [tex]\phi_b = 2 \pi [\frac{b}{\lambda} + ft][/tex]          

Here b is the distance o f the first wave from the considered point  

Gnerally the phase diffencence is mathematically represented as  

           [tex]\Delta \phi= \phi_a - \phi_b = 2 \pi [\frac{ a}{\lambda} + ft ] - 2 \pi [\frac{b}{\lambda} + ft ][/tex]      

=>      [tex]\Delta \phi = \frac{2\pi [ a - b]}{ \lambda }[/tex]

Gnerally the wavelength is mathematically represented as

        [tex]\lambda = \frac{v}{f}[/tex]

=>     [tex]\lambda = \frac{330}{540}[/tex]

=>     [tex]\lambda = 0.611 \ m[/tex]

=>    [tex]\Delta \phi = \frac{2* 3.142 [ 4.40 - 4.0 ]}{ 0.611 }[/tex]

=>    [tex]\Delta \phi = 4.12 \ rad[/tex]

Answer:

the foce aplied to make the net force be 0 is 5n force pushing downward on the object becasue it will cancel it out

Explanation:

Answer:

A. They can transfer energy through a vacuum

C. They vibrate in two directions that are perpendicular to each other

D. They radiate outward in all directions

Explanation:

A statement (A), a statement (C), and a statement (D) are correct because electromagnetic waves can only transfer energy through the vacuum.

The waves that are related to both electricity and magnetism are known as electromagnetic (EM) waves. These waves are made up of time-varying electric and magnetic fields that travel over space.

The correct statements are:

Thus, a statement (A), a statement (C), and a statement (D) are correct because electromagnetic waves can only transfer energy through the vacuum.

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1. ) It's good to remember contact information such as phone number or email.

2.) Your address, so if they need to mail anything to you, they can. This is also a necessary point of information on most job applications anyway.

3.) Past job experiences and ways to contact them. This is probably one of the most important things as it shows you've worked before and are willing to talk to past employers.

May I have brainliest please? :)

Answer:

the other answer is correct

Explanation:

i do flvs and this was on the career final exam

Answer:

Choice: c. 6sec

Explanation:

Horizontal Launch

When an object is thrown horizontally with a speed (v) from a height (h), it describes a curved path ruled by gravity until it finally hits the ground.

The horizontal component of the velocity is always constant because no acceleration exists in that direction, thus:

[tex]v_x=v[/tex]

The vertical component of the velocity changes in time because gravity makes the object fall at increasing speed given by:

[tex]v_y=g.t[/tex]

Where [tex]g=10 m/s^2[/tex]

To calculate the time the object takes to hit the ground, we use the same formula as for free-fall, since the time does not depend on the initial speed:

[tex]\displaystyle t=\sqrt{\frac{2h}{g}}[/tex]

The marble rolls the edge of the table at a height of h=180 m, thus:

[tex]\displaystyle t=\sqrt{\frac{2*180}{10}}[/tex]

[tex]\displaystyle t=\sqrt{36}[/tex]

t = 6 sec

Choice: c. 6sec

Answer:

The answer is:

C) 6sec

Hope it helps:D

Answer:

B. compound

Explanation:

Because Salt (NaCl), sodium chloride, mineral substance of great importance to human and animal health, as well as to industry. The mineral form halite, or rock salt, is sometimes called common salt to distinguish it from a class of chemical compounds called salts.

Answer:

B and either C or D

Explanation:

Answer:

mercury

Explanation:

edge 2020

Answer: She moves 5.616 meters in that second.

Explanation:

If we define t = 0s as the moment when she starts decelerating we can write the function of acceleration as:

a(t) = -(0.63 m/s^2)

where the negative sign is because she is slowing down.

The velocity equation can be found if we integrate over time:

v(t) = -(0.63m/s^2)*t + v0

Where v0 is the constant of integration, that represents the initial velocity, in this case is:

v0 = 32.7 km/h

Now, because the acceleration is in m/s^2, we should write this velocity in m/s.

in one km we have 1000 meters, and in one hour we have 3600 seconds, then we have that:

32.7 km/h = 32.7 *(1000/3600) m/s = 9.08 m/s

Then the velocity equation becomes:

v(t) = -(0.63m/s^2)*t  + 9.08 m/s

And for the position equation, we should integrate again to get:

p(t) = -(1/2)*(0.63m/s^2)*t^2 + (9.08m/s)*t + p0

Where p0 is the initial position.

For this problem, we want to find the distance that she moved between t = 5s and t = 6s, and that can be calculated as:

D = p(6s) - p(5s)

D = -(1/2)*(0.63m/s^2)*(6s)^2 + (9.08m/s)*6s + p0 +(1/2)*(0.63m/s^2)*(5s)^2 - (9.08m/s)*(5s) - p0

D = -(1/2)*(0.63m/s^2)*((6s)^2 - (5s)^2) + (9.08m/s)*(6s - 5s)

D = 5.615 m

She moves 5.616 meters in that second.

Explanation:

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Answer:

[tex]604000\ \text{J}[/tex]

Explanation:

m = Mass of ice = 200 g

[tex]\Delta T[/tex] = Temperature change of water = [tex](100-0)^{\circ}\text{C}[/tex]

c = Specific heat capacity of water = 4200 J/kg °C

[tex]L_f[/tex] = Specific latent heat of fusion = 340 kJ/kg

[tex]L_v[/tex] = Specific latent heat of vaporisation = 2260 kJ/kg

Heat required to convert ice to water = [tex]mL_f[/tex]

Heat required to raise the temperature of water to boiling point = [tex]mc\Delta T[/tex]

Heat required to convert water to steam = [tex]mL_v[/tex]

Total heat required

[tex]q=mL_f+mc\Delta T+mL_v\\\Rightarrow q=m(L_f+c\Delta T+L_v)\\\Rightarrow q=0.2(340\times 10^3+4200(100-0)+2260\times 10^3)\\\Rightarrow q=604000\ \text{J}[/tex]

Heat required to convert the given amount of ice to steam at the required temperature is [tex]604000\ \text{J}[/tex].

Answer:

no work is said to be done by standing man carrying 500kg load because

Explanation:

for the work to be done there should be two conditions i.e force should be applied and displacement must be covered.So for a man carring a 500 kg load force is there but he covers no distance by standing so displacement will be zero and since

work =force\displacement

displacement is zero so we can say that no work is done

Answer:

True

Explanation:

I searched it up :)

A cheap effective and simple way to help the body recover is to get adequate amounts of sleep, as our body need rest to reduce the tiredness and physical as well as mental stress in our human system.

Exercise is the activity that includes the physical movements of the body and results in fitness, wellness, and healthiness of the person to protect and lower the risks of getting diseases. It allows the person to maintain a healthy weight.

Getting enough sleep is an easy, affordable technique to aid in the body's recovery. Resting our bodies helps our minds and bodies recuperate from fatigue and physical and emotional stress.

Thus, an adequate amount of sleep is one of the effective ways to help the body recover.

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Answer:

9653.04 joules

Explanation:

H= 8.2 m

M= 120 kg

G= 9.81 m/s^2

P.E= ?

P.E = MGH

P.E = 120 x 9.81 x 8.2

P.E = 9653.04 joules

Answer:

Calculates the free fall distance and velocity without air resistance from the ... for 24 seconds so i asumed that he fell for twelve seconds and this did the rest of it.

Explanation:

If a rock falls for 4 seconds assuming its initial velocity is zero and its falls only under the influence of gravity it would fall  122.625 m

Newton provided three equations of motion.

The first equation is given as follows

v = u + at

the second equation is given as follows

S = ut + 1/2×a×t²

the third equation is given as follows

v² - u² = 2×a×s

As given in the problem If a rock falls for 4 seconds assuming its initial velocity is zero and its falls only under the influence of gravity it would fall

S = ut + 1/2at²

u= 0 m/s , a=9.81 m/s² and t =4seconds

S = 0+ 0.5*9.81*5²

S= 122.625 m

Thus, the rock would fall 122.625 m if it falls for 4 seconds

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Answer:1020

Explanation:

Answer:

The answer to this question is given below in this explanation sections.

Explanation:

Reliable sources:

un reliable sources: