a batsman deflects a ball by an angle of 45 without changing its initial speed which is equal to 54km/h.what is the impulse imparted to the ball? mass of the ball is 0.15kg​

Answer:

13.5V

Explanation:

u=i*r

u=1.8×7.5=13.5V

Answer:

Images that are not aligned are laterally inverted

Explanation:

When a plane mirror reverses an image so that it becomes upside down and downside up or the other way round, we say that the image is laterally inverted.

Hence the effect produced when a plane mirror reverses an image is called lateral inversion

A good example of lateral inversion ins the lettering of an ambulance

Answer:

The range of the ball is 11.6 meters

Explanation:

Projectile Motion

It's the type of motion that experiences an object launched with an initial angle and moves along a curved path exclusively under the action of gravity.

Being vo the initial speed of the object, θ the initial launch angle, and g the acceleration of gravity, then the maximum horizontal distance traveled by the object (also called Range) is:

[tex]\displaystyle d={\frac {v_o^{2}\sin(2\theta )}{g}}[/tex]

The football is kicked with an initial speed of vo=11 m/s at an angle of θ=35°.

Calculating the range:

[tex]\displaystyle d={\frac {11^{2}\sin(2\cdot 35^\circ)}{9.8}}[/tex]

[tex]\displaystyle d={\frac {121\sin(70^\circ)}{9.8}}[/tex]

d = 11.6 m

The range of the ball is 11.6 meters

Ground-level ozone is the most common pollutant that is often referred to as "smog".

Smog is a type of air pollution that is characterized by a mixture of smoke and fog.

It typically forms in urban areas with high levels of vehicle and industrial emissions, as well as natural factors such as temperature inversions.

Smog is composed of a complex mixture of pollutants, including ground-level ozone, nitrogen oxides, sulfur oxides, particulate matter, and volatile organic compounds (VOCs).

Exposure to smog can cause a range of health problems, including respiratory issues, heart disease, and cancer. It can also have negative impacts on the environment, including damage to crops, forests, and bodies of water. Efforts to reduce smog often involve reducing emissions from vehicles and industrial sources and promoting cleaner forms of transportation and energy production.

Therefore, The Ground-level ozone is the most common pollutant that is often referred to as "smog".

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Answer:

-16i kgm/s

Explanation:

Impulse I = m(v - u) where m = mass of ball = 2.0 kg, u = initial velocity of ball = (4i + 3j) m/s  and v = final velocity of ball = (-4i + 3j) m/s.

So, the impulse is thus

I = m(v - u)

= 2.0 kg[(-4i + 3j) m/s - (4i + 3j) m/s]

= 2.0 kg[(-4i - 4i) + (3j - 3j) m/s]

= 2.0kg[-8i + 0j] m/s

= -16i kgm/s

The impulse on a 2.0-kg ball with an initial velocity of (4i + 3j) m/s collides with a wall and rebounds with a velocity of (–4i + 3j) m/s = 16i

Impulse: This can be defined as change in momentum of a body. The s.i unit of impulse is kgm/s²

The formula of impulse is

I = m(v-u)................ Equation 1

Where, I = impulse exerted on the ball by the wall, m = mass of the ball, v = final velocity of the ball, u = initial velocity of the ball

From the question,

Given: m = 2.0 kg, v = (-4i+3j) m/s, u = (4i+3j)  m/s

Substitute these values into equation 1

I = 2.0[(-4i+3j)-(4i+3j)

I = 2.0(-4i-4i+3j-3j)

I  = 2.0(-8i+0j)

I = -16i.

Hence the impulse exerted by the wall on the ball is -16i

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Answer:

The force of gravity

Explanation:

The sun is able to predictably hold the asteroid and the earth in orbit by the force of gravity is possesses.

During the earth formation of the solar system, the sun captured the earth and other planetary bodies within its region of influence.

Answer:

when pure water vapor from the water bodies get absorbed into polluted gases in the atmosphere, acid rain is caused and when this happens in a place where an element of the hydrosphere is located, it is polluted.in such a way hydrosphere is effected

Answer: When a parcel of air in the atmosphere becomes saturated with water, precipitation, such as rain or snow, can fall to Earth's surface.

Explanation:

Human contributions to greenhouse gases in the atmosphere are warming the earth's surface a process which is projected to increase evaporation of surface water and accelerate the hydrologic cycle. In turn, a warmer atmosphere can hold more water vapor.

Answer:

there is no net force onthe car

Explanation:

khan academy

Answer:

If it has balanced forces, then it is completely still.

Balanced forces do not cause a change in motion. So, the object that has balanced forces acting on it either moves with constant speed at a constant direction or remains rest.

Two forces are said to be balanced when their strengths are equal but their directions of action are opposing. Once more, tug-of-war is a prime illustration. The forces are balanced if the pullers are exerting equal force but going in the opposite direction on either side of the rope. There is hence no motion.

Forces that are balanced can cancel one another out. The thing stays in place whenever there is a balanced force.

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Answer:

Option B. 4a꜀

Explanation:

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

Initial speed (v₁) = v

Initial acceleration (a₁) = a꜀

New speed (v₂) = 2v

New acceleration (a₂) =?

Centripetal acceleration is given by the following equation:

a = v²/ r

Next, we shall make r the subject.

a = v²/ r

Cross multiply

a × r = v²

Divide both side by a

r = v² / a

NOTE: We assume the radius (r) to be constant.

v₁² / a₁ = v₂² / a₂

Thus, we shall determine the new acceleration as follow:

Initial speed (v₁) = v

Initial acceleration (a₁) = a꜀

New speed (v₂) = 2v

New acceleration (a₂) =?

v₁² / a₁ = v₂² / a₂

v² / a꜀ = (2v)² / a₂

v² / a꜀ = 4v² / a₂

Cross multiply

v² × a₂ = a꜀ × 4v²

Divide both side by v²

a₂ = a꜀ × 4v² / v²

a₂ = a꜀ × 4

a₂ = 4a꜀

Therefore, the new centripetal acceleration of the object is 4a꜀

Answer:

4.0 · ac

Explanation:

Just did it

Answer:

the correct one is b,  Decrease the launch speed and Low the launch height

Explanation:

Let's find the solution to the problem in order to answer the questions.

The bullet is fired horizontally with a velocity vo, let's find the time or it takes to reach the ground

      y = y₀ + [tex]v_{oy}[/tex] t - ½ g t²

as it shoots horizontally v_{oy} = 0 and when I reach the floor y = 0

       0 = y₀ - ½ g t2

       t = [tex]\sqrt{\frac{2y_{o} }{g} }[/tex]

where y₀ is the height of the cliff

at this time the bullet recreates a distance of

       x = v₀ t

we substitute

       x = v₀ \sqrt{\frac{2y_{o} }{g} }

There, to reduce the range of the bullet, we must decrease its speed. This is the magnitude that most affects the distance and to a lesser degree we can decrease the height.

When checking the answers, the correct one is b

Answer:

v = 22.58[m/s]  

Explanation:

To solve this problem we will use the principle of energy conservation, which tells us that potential energy is transformed into kinetic energy or vice versa.

[tex]E_{kin}=E_{pot}[/tex]

We must remember that potential energy is defined as the product of mass by gravity by height.

[tex]E_{pot}=m*g*h[/tex]

And the kinetic energy can be calculated by means of the following expression.

[tex]E_{kin}=0.5*m*v^{2}\\[/tex]

Now equalizing the two equations we can determine the initial velocity.

[tex]m*9.81*26=0.5*m*v^{2}\\255.06=0.5*v^{2}\\v=\sqrt{255.06/0.5}\\v=22.58[m/s][/tex]

Explanation:

Graph A matches description 4 because the car is coming back.

Graph B matches description 3 because the speed of the car is decreasing.

Graph C matches the description 2 because the car is traveling at a constant rate.

Graph D matches the description 1 because the car is stopped.

Answer:

Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has kinetic energy. There are many forms of kinetic energy - vibrational (the energy due to vibrational motion), rotational (the energy due to rotational motion), and translational (the energy due to motion from one location to another). To keep matters simple, we will focus upon translational kinetic energy. The amount of translational kinetic energy (from here on, the phrase kinetic energy will refer to translational kinetic energy) that an object has depends upon two variables: the mass (m) of the object and the speed (v) of the object. The following equation is used to represent the kinetic energy (KE) of an object.

KE = 0.5 • m • v2

where m = mass of object

v = speed of object

This equation reveals that the kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four. For a threefold increase in speed, the kinetic energy will increase by a factor of nine. And for a fourfold increase in speed, the kinetic energy will increase by a factor of sixteen. The kinetic energy is dependent upon the square of the speed. As it is often said, an equation is not merely a recipe for algebraic problem solving, but also a guide to thinking about the relationship between quantities.

Kinetic energy is a scalar quantity; it does not have a direction. Unlike velocity, acceleration, force, and momentum, the kinetic energy of an object is completely described by magnitude alone. Like work and potential energy, the standard metric unit of measurement for kinetic energy is the Joule. As might be implied by the above equation, 1 Joule is equivalent to 1 kg*(m/s)^2.

1 Joule = 1 kg • m2/s2

Explanation:

Answer:

Speed at bottom of the hill (v) = 11.74 m/s

Explanation:

Given:

Combined mass = 48.8 kg

Height h = 7.05 m

Find:

Speed at bottom of the hill (v)

Computation:

v² = 2gh

v = √2 x 9.8 x 7.05

v = √138.18

v = 11.74 m/s

Speed at bottom of the hill (v) = 11.74 m/s

Answer:

1.87 ms-2

Explanation:

We need to convert the velocity from km/hr to m/s as follows;

100 × 1000/3600 = 27.7 m/s

Also

120 × 1000/3600 = 33.3 m/s

From;

v= u + at

v= 33.3 m/s

u= 27.7 m/s

t= 3 secs

v= u + at

a = v- u/t

a = 33.3 - 27.7/3

a= 1.87 ms-2

Answer:

GRAVITYYYYY

HOPE THIS HELPS

Answer: There is a net force acting on which is a force of gravity

Explanation:

Answer:

The mass of the dog is 15 kg

Explanation:

We use the formula for the kinetic energy of the dog:

[tex]KE=\frac{1}{2} m\,v^2[/tex]

Then, in our case:

[tex]KE=\frac{1}{2} m\,v^2\\1080 \,=\,\frac{1}{2} m\,(12)^2\\m = \frac{2*1080}{144} \\m=15 \,\,kg[/tex]

Answer:

Physicists use a hand mnemonic known as the right-hand rule to help remember the direction of magnetic forces. To form the mnemonic, first make an L-shape with the thumb and first two fingers of your right hand. Then, point your middle finger perpendicular to your thumb and index finger.

Answer:

If you point your pointer finger in the direction the positive charge is moving, and then your middle finger in the direction of the magnetic field, your thumb points in the direction of the magnetic force pushing on the moving charge.

Explanation:

Got it right

Answer:

A producer needs the sun to make its own food, because producers use photosynthesis. In photosynthesis you use the sun to turn the air people breathe out and water into glucose and oxygen.

Explanation:

Hope this helps ^-^

Answer:

v= 14.85 m/s

Explanation:

       [tex]F_{cent} = F_{n} - F_{g} (1)[/tex]

       [tex]F_{n} = m*\frac{v^{2} }{r} + m*g (3)[/tex]

      [tex]F_{n} = 1.15*F_{g} = m*\frac{v^{2}}{r} +F_{g} (4)[/tex]

       [tex]v = \sqrt{0.15*g*r} = \sqrt{9.8 m/s2*0.15*150m} = 14.85 m/s (5)[/tex]

Answer:

The number of revolutions is 10.68 rev/min.

Explanation:

Given that,

Radius = 8 m

Suppose,  centripetal acceleration equal to the gravity

[tex]a_{c}=g=9.8[/tex]

We need to calculate the velocity

Using formula of centripetal acceleration

[tex]a_{c}=\dfrac{v^2}{r}[/tex]

[tex]v^2=a_{c}\times r[/tex]

Put the value into the formula

[tex]v=\sqrt{9.8\times8}[/tex]

[tex]v=8.85\ m/s[/tex]

We need to calculate the value of [tex]\omega[/tex]

Using formula of velocity

[tex]v=r\omega[/tex]

[tex]\omega=\dfrac{v}{r}[/tex]

Put the value into the formula

[tex]\omega=\dfrac{8.85}{8}[/tex]

[tex]\omega=1.12\rad/s[/tex]

We need to calculate the number of revolutions

Using formula of angular frequency

[tex]\omega=\dfrac{2\pi}{T}[/tex]

[tex]\omega=2\pi N[/tex]

[tex]N=\dfrac{\omega}{2\pi}[/tex]

Put the value into the formula

[tex]N=\dfrac{1.12}{2\pi}[/tex]

[tex]N=0.178\ rev/s[/tex]

Using conversion rev/s to rev/min

[tex]N=0.178\times 60[/tex]

[tex]N=10.68\ rev/min[/tex]

Hence,  The number of revolutions is 10.68 rev/min.

Answer:

300 m  

Explanation:

using constant acceleration equations:

v = vi + a * t, v = final velocity = 0m/s , vi =  initial velocity = 60m/s,

a = acceleration = -6m/s², t = time

solve t

t = 10s

x = vi * t + .5 * a * t²

plug

x = 300 m

This question is incomplete, the complete question is;

A 30-kilogram child moving at 4.0 meters per second jumps onto a 50-kilogram sled that is initially at rest on a long, frictionless, horizontal sheet of ice.

a. Determine the speed of the child-sled system after the child jumps onto the sled.

b. After coasting at constant speed for a short time, the child jumps off the sled in such a way that she is at rest with respect to the ice. Determine the speed of the sled after the child jumps off

Answer:

a) the speed of the child-sled system after the child jumps onto the sled is 1.5 m/s

b) the speed of the sled after the child jumps off is 2.4 m/s

Explanation:

Given that;

Weight of the child m_c = 30 kg

u = 4 m/s

M = 50 kg

a) the speed of the child-sled system after the child jumps onto the sled.

Using conservation of momentum;

P_i = P_f

30 × 4 = 50(v) + 30(v)

120 = 80(v)

v = 120 / 80

v = 1.5 m/s

therefore, the speed of the child-sled system after the child jumps onto the sled is 1.5 m/s

b) the speed of the sled after the child jumps off .

Also using conservation of momentum;

mv1 = mv2

(30+50) × 1.5 = (30 × 0) + (50 × v2 )

80 × 1.5 = 50v2

v2 = 120 / 50

v2 = 2.4 m/s

Therefore the speed of the sled after the child jumps off is 2.4 m/s

Answer:

Symbolic culture, or nonmaterial culture, is the ability to learn and transmit behavioral traditions from one generation to the next by the invention of things that exist entirely in the symbolic realm. Symbolic culture is studied by archaeologists, social anthropologists and sociologists.

Explanation:

i hope this helped!