Please answer the question

Answer: 120 km per hour.

Explanation: 300/2.5 = 120.

In projectile horizontal distance is given by :

[tex]h = \dfrac{u^2sin^ 2\theta}{2g}[/tex]

Putting all given values, we get :

[tex]h = \dfrac{u^2sin^ 2\theta}{2g}\\\\h=\dfrac{16^2\times sin^2 \ 55.3^o}{2\times 9.8}\\\\h=13.1\ m[/tex]

Therefore, maximum height of football is 13.1 m.

Hence, this is the required solution.

Answer:

a

The height is   [tex]H  = 6.74 \  m [/tex]

b

The horizontal distance is  [tex]D  = 23.74 \  m [/tex]

Explanation:

From the question we are told that

  The speed is  [tex]v  =  15 \  m/s[/tex]

  The angle is  [tex]\theta  =  40^o[/tex]

   The height of the cannon from the ground is  h  =  2 m

  The distance of the net from the ground is k  =  1 m

Generally the maximum height she reaches is mathematically represented as  

     [tex]H  =  \frac{v^2 sin^2 \theta }{2 *  g }  +  h[/tex]

=>    [tex]H  =  \frac{(15)^2 [sin (40)]^2 }{2 * 9.8}  +  2[/tex]

=>    [tex]H  = 6.74 \  m [/tex]

Generally from kinematic equation  

    [tex]s = ut + \frac{1}{2} at^2[/tex]

Here s is the displacement which is mathematically represented as

         s  =  [-(h-k)]  

    =>  s =  -(2-1)

    =>  s  = -1 m

There reason why s =  -1 m is because upward motion canceled the downward motion remaining only the distance of the net from the ground which was covered during the first half but not covered during the second half

     a =  -g = -9.8

    [tex]u  =  v sin (\theta)[/tex]

So

    [tex]-1 = (vsin 40 )t + \frac{1}{2} * (-9.8) t^2[/tex]

=>  [tex]-4.9t^2 + 9.6418t + 1 = 0[/tex]

using  quadratic formula to solve the equation we have

    [tex]t  =  2.07 \  s[/tex]

Generally distance covered along the horizontal is  

   [tex]D  =  v cos (40) *  2.07[/tex]

=>   [tex]D  =  15 cos (40) *  2.07[/tex]

=>   [tex]D  = 23.74 \  m [/tex]

Answer:

energy which a body possesses by virtue of being in motion.

Answer:

kinetic energy, simply, is movement energy. it is energy which an object posses for its motion. in order to accelerate the object force must be applied. examples include:

Answer:

PEgrav = m *• g • h

Explanation:

In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.

Hope this helps

The property of air which makes it effective in protecting firefighters is that it is a poor thermal conductor.

We define air as a mixture of gasses. We know that there a re several gases that are known to compose air and among these are oxygen, carbon dioxide, noble gasses and nitrogen.

We know that air is a poor conductor of heat. As such, air does not heat up quite easily and this would help to protect the fireman from getting burnt since air does not easily allow heat to pass through it as it were, this is why the firefighters depend on the insulative property of air.

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Answer:

Explanation:

In this unit of measurement for distance or length, the units are arranged from the least to the largest unit i.e

mm < cm < m < km

Where mm is millimeter, cm is centimeter, m is meter and km is kilometer.

Hence, the appropriate unit to be used depends on how small or wide the length/distance being referred to is. For instance, the length of a stapler pin should be measured in millimeter while the length of a pen should be measured in centimeter. The appropriate measurement can be determined by determining the closest unit the value falls into. For instance, there is no need to refer to a length as 1000 cm when it can be referred to as 10 m (since 100 cm equals 1 m)

1. Width of a physics book should be measured in centimeters (this is similar to length of a pen).

2. Distance from New York to Utah should be measured in kilometers (Distance between far cities or states are measured in kilometers).

3. Length of a fingernail should be measured in millimeters (this is similar to the length of a stapler pin)

4. Length of hallway should be measured in meters (This is generally larger than centimeter but lesser than kilometer)

5. Height of a mountain should be measured in kilometers (This is usually a very long distance from the earth surface)

6. Length of a fork should be measured in centimeters (This is similar to the length of a pen).

7. Distance between cities should be measured in meters (except the distance is far apart, distance between close cities are measured in meters)

8. Width of the eyeball should be measured in millimeters (similar to the length of a stapler pin and fingernail).

Answer:

The correct answer is - containers 1 and 3.

Explanation:

In any experiment or investigation, there must be all the factors should be constant other than the variable that is changed to see the effect on the result or desired character.

In this experiment to check the effect of the temperature, there must be the only temperature is a variable that should be manipulated rest should remain constant. In container 1st and 3rd, all the variable amount of sugar, the method of mixing all are the same except temperature.

Thus, the correct answer is - 1 and 3rd.

Answer:

true

Explanation:

hope this helps

You don't need to calculate anything.

You said "0.05 Ampere".

"Ampere" means "coulomb per second".

Answer:

scatter plots show the relationship between the independent and dependent variables

Explanation:

A scatter plot is a graph which shows two variables plotted along two axes (usually the x and y axes). Scatter plots are useful in establishing any form of correlation between the dependent and independent variables in any study.

Correlation simply means the degree of relationship between variables, that is, how much does one variable affect the other? When scatter plots are almost a straight line graph, there is a high correlation between the variables. When the points in a scatter plot are isolated, there is little (sometimes zero) correlation between the variables.

Answer:

The answer is 400

Explanation:

Answer:

12 meters

Explanation:

to find this we look at the 8 on the horizontal line this is 8 seconds, you then look upwards to see the height at that point in time

Answer:

82.2

Explanation:

Answer: what is the person’s distance

Answer:

A)Opposite direction

Explanation:

hope this helps ;)

Answer:b

Explanation:

The resistance in a circuit is directly proportional to the length of the wire. Thus as the length increases, R increases and current I decrease. But the voltage v remains constant.

Ohm's law states that, the voltage across a circuit is the product of the current and resistance.

Thus, V = I R

The resistance R is expressed by the expression:

R = ρ l/a

where ρ  is the proportionality constant called resistivity and l and a be the length and area of the wire.

Thus, as the length increases, resistance also increases.

The increase in resistance result in a decrease the current through  the circuit. Therefore, voltage remains constant. Hence, option B is correct.

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Answer:

[tex]\boxed {\tt \frac{2}{3} \ or \ 0.666666667 \ g/cm^3}[/tex]

Explanation:

Density can be found by dividing the mass by the volume.

[tex]d=\frac{m}{v}[/tex]

The mass is 20 grams.

We have to find the volume.

[tex]m= 20 \ g\\v= 30 \ cm^3[/tex]

Substitute the values into the formula.

[tex]d=\frac{20 \ g}{30 \ cm^3}[/tex]

Divide.

[tex]d=\frac{2}{3} \ g/cm^3[/tex]

[tex]d= 0.666666667 \ g/cm^3[/tex]

The density is 2/3 grams per cubic centimeter.

Answer:

Explanation:

i didnt got what you had said about qn 1 and 2

qn 10 :pic given

qn 11;F = m * a

The apple's acceleration is not influenced by the acceleration due to gravity for this question.  In real life it most certainly is influenced by gravity.

F = m * a

F = 10 Newtons.

a = 6 m/s^2

m = 10/6 = 1.66 kg.

Answer:

800 calories are required to melt a 10g ice cube which is at 0 degrees C.

Explanation:

hope this helps, have an amazing day

Answer:

the higher up an object is, the more potential energy it has

Explanation:

Answer:

gexp = 3.65 m/s²

Explanation:

The value of acceleration due to gravity changes with the altitude. The following formula gives the value of acceleration due to gravity at some altitude from the sea level:

gexp = g(1 - 2h/Re)

where,

gexp = expected value of g at altitude = ?

g = acceleration due to gravity at sea level = 9.8 m/s²

h = altitude = 2000 km = 2 x 10⁶ m

Re = Radius of Earth = 6.37 x 10⁶ m

Therefore,

gexp = (9.8 m/s²)(1 - 2*2 x 10⁶ m/6.37 x 10⁶ m)

gexp = 3.65 m/s²

Answer:

The brick was traveling at 49 m/s the instant before hitting the ground.

Explanation:

When an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is [tex]g = 9.8 m/s^2[/tex].

The final velocity of a free-falling object after a time t is given by:

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

The distance traveled by a dropped object is:

[tex]\displaystyle y=\frac{gt^2}{2}[/tex]

The brick takes 5 seconds to land from the high scaffold. The speed at which it lands is:

[tex]vf=9.8\cdot 5[/tex]

vf=49 m/s

The brick was traveling at 49 m/s the instant before hitting the ground.

Answer:

The speed at which she threw the marshmallow is approximately 4.76 m/s

Explanation:

The given in formation are;

The range in which the marshmallow was thrown = 2 m (The location of her friend)

The angle at which the marshmallow was thrown = 30 degrees

The horizontal range is given by the following formula;

[tex]R = \dfrac{u^2 \times sin(2\cdot \theta)}{g}[/tex]

Where;

R = The range = 3 m

u = The initial velocity

θ = The angle at which the marshmallow was thrown = 30°

g = The acceleration due to gravity = 9.81 m/s²

By substitution, we have;

[tex]2 = \dfrac{u^2 \times sin(2\times 30)}{9.81} = \dfrac{u^2 \times sin(60)}{9.81}[/tex]

[tex]\therefore u^2 = \dfrac{ 2 \times 9.81}{sin(60)} = \dfrac{u^2 \times sin(60)}{9.81} \approx 22.66[/tex]

u ≈ √(22.66) ≈ 4.76 m/s

u ≈ 4.76 m/s

The speed at which she threw the marshmallow ≈ 4.76 m/s.

Answer:

4.76 m/s

Explanation: