Starting from rest, a car accelerates at 2.0 m/s2 up a hill that is inclined 5.5° above the horizontal. How far (a) horizontally and (b) vertically has the car traveled in 12 s?

Jack speed as he hits the water is 14.13m/s

What is speed?
The speed of an object, also known as v in kinematics, is the size of the change in that object's position over time or the size of the change in that object's position per unit of time, making it a scalar quantity. The instantaneous speed is the upper limit of the average speed as the duration of the time interval approaches zero. The average speed of an item in a period of time is equal to the distance travelled by the object divided by the duration of the period. Velocity and speed are not the same thing.

The only force on Jack is gravity, which points straight down, and has an acceleration of 9.91m/s².  Whether he's falling off a bridge or simply standing still on the surface of the earth, the acceleration due to gravity is the same.

If you're looking for the speed of Jack as he hits the water, you just need to solve for v in the equation[tex]$v^2 = v_0^2 + 2ad$[/tex].  
Here,
v is Jack's speed as he hits the water,
[tex]$v_0$[/tex] is Jack's initial speed (which is zero since he's not moving when he jumps),
a is Jack's acceleration (which is 9.91m/s²), and
d is Jack's displacement (which is the height of the bridge, which you said is 10m).  
This gives you an answer of [tex]$v = \sqrt{2ad} = \sqrt{2(9.91)(10)} = 14.13 \ \mathrm{m/s}$[/tex]

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Features that must be present for a stable well-designed racing car.

For, a racing car the speed is high and also to finish the race, the car should be easy to turn around.

Lower the centre of gravity more will be its stability.

A low centre of gravity is a must for a stable well-designed racing car.

The auricle, also known as pinna is the visible portion of outer ear.

The purpose of auricle is to collect sound waves and send them through ear canal.

The eustachian tube connecting middle ear and back of nose, equalizes air pressure on both sides of the eardrum.

Thus, the statement is false.

The acceleration of a car, moving along a straight line, that increases its velocity from 0 to 15 is A=1.5m/s.

Acceleration = Velocity Change / Time Interval

So,

A=15/10

A=1.5m/s .

A slowing car slows down. It also accelerates because the speed changes. Imagine a car driving down the street. As speed increases, the car has positive acceleration. When a car turns a corner at a constant speed it changes direction and thus accelerates. The faster the rotation the greater the acceleration.

Therefore, any change in velocity in magnitude and direction causes acceleration. The main causes of poor acceleration are air and fuel issues and sensor issues. However mechanical problems can also cause poor performance. The car is moving forward and accelerating in the positive direction so the acceleration is in the same direction as the car is moving. An object can also have positive acceleration if it slows down while moving in a negative direction.

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The gauge pressure at the bottom of the tank is 297500 N/m².

The magnitude of the net force that acts on a square access hatch at the bottom of the tank is 107100 N.

The pressure at the bottom of the tank is the pressure due to the weight of the fluid above it and the atmospheric pressure.

The pressure due to the atmosphere = 101300 N/m²

The pressure due to the water above the tank is calculated with the formula below:

Pressure = height * density * g

height of tank = 20 m

the density of water = 1 * 10³ kg/m³

g = 9.81 m/s²

Pressure due to water = 20 * 1 * 10³ kg/m³ * 9.81

Pressure due to water = 192000 N/m²

Total pressure = 192000 + 101300 N/m²

Total pressure = 297500 N/m²

B. Force = pressure * area

area of the hatch = 0.6 * 0.6 = 0.36 m²

Force = 297500 N/m² * 0.36 m²

Force = 107100 N

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A cylinder with a movable piston contains 3 moles of hydrogen at standard temperature and pressure. The walls of the cylinder are made of a heat insulator, and the piston is insulated by having a pile of sand on it. By what factor does the pressure of the gas increase if the gas is compressed to half its original volume?

Solution :

The cylinder is completely insulated from its surroundings. As a result, no heat is exchanged between the system (cylinder) and its surroundings. Thus, the process is adiabatic.

Initial pressure inside the cylinder =P1

Final pressure inside the cylinder =P2

Initial volume inside the cylinder =V1

Final volume inside the cylinder =V2

Ratio of specific heats, γ=CVCP=1.4

For an adiabatic process, we have:

P1V1γ=P2V2γ

The final volume is compressed to half of its initial volume.

∴V2=V1/2

P1V1γ=P2(V1/2)γ

P2/P1=V1γ/(V1/2)γ

=21.4=2.639

Hence, the pressure increases by a factor of 2.639.

Answer:

The cylinder is fully isolated from the rest of the environment.

There is no heat exchange between the system (cylinder) and its surroundings as a result of the design. As a result, the process is called adiabatic.

P1 represents the initial pressure inside the cylinder.

P2 is the final pressure within the cylinder.

V1 is the volume of the cylinder at its beginning.

The final volume of the cylinder is equal to V2.

The specific heat ratio, = Cp / Cv = 1.4,

We have the following for an adiabatic process:

P1V1γ = P2V2γ

After compression, the final volume is reduced to half of its original size.

Hence,

V2 = V1 / 2

P1V1γ = P2(V1 / 2)γ

P2 / P1 = V1γ / (V1 / 2)γ

= 21.4

We get,

= 2.639

Therefore, the pressure increases by a factor of 2.639

Explanation:

hope it helps you

The mass M₂ that one must hang from the glider in order to obtain an acceleration equal to that of the Porsche is 0.664 kilograms.

The initial velocity U of the porche is 0miles/hours or 0m/s.

The final velocity V of the porche is 60miles/hours or 26.84 m/s.

Total time period is 5 seconds,

Using equation of motion,

V+U = at

Putting all the values,

26.84= a(5)

a =  5.364 m/s².

Now, the mass of the glider is 0.550 Kg.

Let us assume that the glider and the mass are connected by a string. The tension in the string is T.

The mass M2 is hanged from one end the glider is on the horizontal surface.

When the system is released,

Total force on glider,

(0.550)a = T

Total force on the mass M2,

M2(a) = M2g - T.

Putting the value of T,

M2a = M2g - (0.550)a

(0.550)a = M2(g-a)

M2 = (0.550)×5.364/(9.8-5.364)

M2 = 0.664 Kg.

The required mass to be hung is 0.664 Kg.

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The magnitude of the force is found to be 274.19N.

Force (F1)acting on θ1(190°) is 180N

Force (F2)acting on θ2(260°) is 140N

Therefore the angle between F1 and F2 is

θ2-θ1 = 180°-140° =40°

Now we calculate magnitude of force,

Magnitude of force ,F= F1+F2

F. F = [tex]\sqrt{ ( F1+F2). (F1+F2) }[/tex]

|F|² = [tex]\sqrt{F1 ²+F2 ²+F1 F2 COS θ}[/tex]

F= [tex]\sqrt{ 180²+140²+2×180×140× cos40°}[/tex]

F= [tex]\sqrt{32400+19600+23184}[/tex]

F= [tex]\sqrt{75184}[/tex]

F= 274.19N.

Thus, the magnitude of the force is found to be 274.19N.

The magnitude of the force is the entire quantity of forces acting on an object. When all forces are pulling in the same direction, the force becomes stronger. The strength of a force decreases as it is applied to an object from various angles.

Force has a magnitude and a direction, thus a vector quantity. The outcomes of two equal-sized forces acting in opposite directions one in the east and the other in the west are not the same.

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Answer:

Approximately [tex]7.1\; {\rm kN}[/tex] ([tex]5 \sqrt{2}\; {\rm kN}[/tex].)

Explanation:

Let [tex]F_{1}[/tex] and [tex]F_{2}[/tex] denote the two forces that act on this beam. Let [tex]s_{1}[/tex], [tex]s_{2}[/tex], [tex]\theta_{1}[/tex], and [tex]\theta_{2}[/tex] denote the distance from pivot and angle relative to the beam of the two forces, respectively. The magnitude of the torques that the two forces exert on this beam will be [tex]F_{1}\, s_{1}\, \sin(\theta_{1})[/tex] and [tex]F_{2}\, s_{2}\, \sin(\theta_{2})[/tex], respectively.

The two forces in this question act on the beam from opposite sides of the pivot. Hence, for the beam to be in equilibrium, the torque from the two forces need to be equal in magnitude. In other words:

[tex]F_{1}\, s_{1}\, \sin(\theta_{1}) = F_{2}\, s_{2}\, \sin(\theta_{2})[/tex].

Let [tex]F_{1}[/tex] denote the [tex]5\; {\rm kN}[/tex] force that the load exerts on this beam; [tex]\theta = 90^{\circ}[/tex] since this load is placed directly on the beam. The normal force from the load will be perpendicular to the beam.

Let [tex]F_{2}[/tex] denote the force that the rope exerts on this beam; [tex]\theta = 45^{\circ}[/tex].

Note that [tex]s_{1} = s_{2}[/tex] since the pivot is exactly halfway between the two forces.

Rearrange the equation [tex]F_{1}\, s_{1}\, \sin(\theta_{1}) = F_{2}\, s_{2}\, \sin(\theta_{2})[/tex] to find the unknown [tex]F_{2}[/tex]:

[tex]\begin{aligned}F_{2} &= \frac{F_{1}\, s_{1}\, \sin(\theta_{1})}{s_{2}\, \sin(\theta_{2})} \\ &= \frac{F_{1}\, \sin(\theta_{1})}{\sin(\theta_{2})} && (\text{since $s_{1} = s_{2}$}) \\ &= \frac{5\; {\rm kN}\, \sin(90^{\circ})}{\sin(45^{\circ})} \\ &= \frac{5\; {\rm kN}}{(1 / \sqrt{2})} \\ &= 5 \sqrt{2}\; {\rm kN} \\ &\approx 7.1\; {\rm kN} \end{aligned}[/tex].

The tension in the rope will be equal in magnitude to the force exerted on the beam: approximately [tex]7.1\; {\rm kN}[/tex] ([tex]5 \sqrt{2}\; {\rm kN}[/tex].)

a) Peak value = 20

b) Average value = 9.0

c) RMS value = 14.15

The peak-to-peak value = 40

c) The rms value

b) Average value over alternation of the sine wave

From the calculations, the normal force on the body is 345 N.

Let us recall the theory of Newton that states that action and reaction are equal and opposite. We know that the force that is exerted on an object is equal to the reaction of that surface of the object on the source of the force.

We know that the normal force can be given by the formula;

N = mgcosθ

m = mass of the object

g = acceleration due to gravity

θ = angle involved

We would now have

N = 43.0 kg * 9.8 m/s^2 * cos 35

N = 345 N

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The net force acting on the box is 15 N. The force acting on a box is unbalanced because the force on one side is 7 N while the force on other side is 8 N.

Force is defined as a push or pull exerted on an object as a result of the interaction of the object with another object.

It can also be defined as a factor that can alter how an object moves.

Net force is defined as the force that is the result of all forces concurrently acting on an object.

It can also be defined as all of the forces acting on an object are added together into a vector.

Net force = F1 + F2 + F3

               = 7N + 4N + 4N

              = 15 N

Thus, the net force acting on the box is 15 N. The force acting on a box is unbalanced because the force on one side is 7 N while the force on other side is 8 N.

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The current density of a 7.0 mm diameter copper wire that carries a current of 7.0 μA is 18.19 × 10⁻³ A/m².

The quantity of electric modern-day journeying in step with the unit move-phase region is known as current density and is expressed in amperes per rectangular meter. The more present-day a conductor, the higher could be the modern-day density. current density is the quantity of electrical modern flowing in step with the unit move-sectional region of a material.

subsequently, the SI unit of current density needs to be Ampere/meter2. Ohm's law relates the current flowing via a conductor to the voltage V and resistance R; this is, V = IR. An alternative assertion of Ohm's law is I = V/R.

current I = 0.7 μA

r = 3.5mm

J = I/A = I/πr³

J = 0.7 × 10⁻⁶ / 3.14 × (3.5 × 10⁻³)²

J = 18.19 × 10⁻³ A/m²

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Takeoff speed of the froghopper is 2.786 m/s

By analyzing the vertical motion of the froghopper,

The initial vertical velocity of the froghopper as it jumps from the ground is given by

[tex]U_{y}[/tex] = U₀Sinθ

here, θ = 57°

Therefore Sin57° = 0.838

[tex]U_{y}[/tex]= 0.838U₀

Vertical motion is the motion that occurs when the object is thrown all the way up, i.e. , the initial velocity or force acts only in the vertical axis, therefore this motion has only vertical motion.

Maximum height reached by the froghopper is h = 278 mm

h = 0.278 m

As we know that vertical velocity at the point of maximum height will be zero,

[tex]V_{y} = 0[/tex]

Since the vertical motion is an accelerated motion with constant (de)acceleration, so by using Equation of motion,

[tex]V^{2} _{y} - U^{2} _{y} = 2gh[/tex]

[tex]U_y = \sqrt{V^{2} _{y} - 2gh }[/tex]

[tex]U_y = \sqrt{0 - 2(-9.81) (0.278) }[/tex]

[tex]U_{y}[/tex] = 2.335 m/s

[tex]U_{y}[/tex] = 0.838U₀

U₀ = [tex]\frac{U_y}{0.838}[/tex]

U₀ = [tex]\frac{2.335}{0.838}[/tex]

U₀ = 2.786 m/s

The takeoff speed of the froghopper is 2.786 m/s.

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B: The change in temperature increases the force of the collisions of

the container and gas particles, so the pressure increases.

P = F/A

Force is directly proportional to Force, so , if force increases also Pressure.

Thesppeed of electromagnetic waves remains the same an is eqal to the speed of light. The wavelength is rearlated tothe energy bty the following ormula:

Wher:

Therefore, if the wavelength increases the frequency must decrease.-

Since the energy is proportiona to the frequency if the dfrequency decreases the energy decreases. Therefore, the right answer is A.

Answer:

energy decreases

Explanation:

hope this helps!

In order to calculate the net force acting on the object, we can use the second law of Newton:

So, for a mass of 4 kg and an acceleration of 3 m/s², we have:

Therefore the net force is 12 Newtons.

The statement that correctly differentiates between astronomy and cosmology is as follows: Astronomy is a much broader study of the universe as a whole, while cosmology is a more focused study on specific objects or celestial bodies contained within the universe (option A).

Astronomy is the study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe.

On the other hand, cosmology is the study of the physical universe, its structure, dynamics, origin and evolution, and fate.

Astronomy studies objects and phenomena beyond Earth, whereas cosmology is a branch of astronomy that studies the origin of the universe and how it has evolved.

Therefore, it can be said that astronomy studies the universe from a much broader sense while cosmology is much more specific study.

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Answer: Cs = [m1c1(T - T1) + mcCc(T - Ts)]/Ms(Ts - T)

Explanation:

The concept of heat exchange which is expressed as

heat lost by a hot body = heat gained by a cold body

The specific heat of a solid substance as determined by the method of mixture using the heat exchange concept would be

Heat lost by substance = heat gained by liquid + heat gained by calorimeter

Thus,

MsCs(Ts - T) = m1c1(T - T1) + mcCc(T - Tc)

Dividing both sides by Ms(Ts - T)

The formula for calculating the specific heat capacity by method of mixtures is

Cs = [m1c1(T - T1) + mcCc(T - Ts)]/Ms(Ts - T)

Where

m1 = mass of liquid

c1 = specific heat of liquid

ms = mass of substance

Cs =specific heat of substance

mc = mass of calorimeter

Cc = specific heat of material used in making the calorimeter

T = Final temperature of the mixture

T1 = initial temperature of the liquid

Ts = initial temperature of the substance

a) Frequency is the number of complete oscillations per second. Looking at the graph, there are 9 complete oscillations in 5 seconds. Thus,

Frequency = 9/5 = 1.8 oscillations per second

Frequency = 1.8 Hz

Period = 1/frequency = 1/1.8

Period = 0.056 s

b) When we differenctiate displacement with respect to time, the result is velocity.

Recall, period = 1/f = 5/9 cycles

1/4 cycle behind = 1/4 x 5/9 = 5/36

It is delayed with 5/36 sec with respect to displacement.

5/36 sec = 0.139 sec

Acceleration = first derivative of velocity = second derivative of displacement = 1/4 cycle behind velocity = 1/2 cycle behind displacement =

5/36 = 0.139 sec delayed with respect to velocity

= 5/18 = 0.2777 secs delayed with respect to displacement

Thus, the number of seconds out of phase with the displacements is 0.278 seconds

c) The formula for calculating the period of an ideal pendulum anywhere is

T = 2π√length/local gravity). We would calculate the local gravity.

From the information given,

length = 0.2

T = P = 5/9

Thus,

5/9 = 2π√0.2/local gravity)

(5/9)/2π = √0.2/local gravity

Square both sides. It becomes

[(5/9)/2π]^2 = 0.2/local gravity

local gravity = 0.2/[(5/9)/2π]^2

local gravity = 25.56 m/s^2

Thus,

acceleration due to gravity = 25.56 m/s^2

Recall, earth's gravity = 9.8 m/s^2

number of g forces = 25.56/9.8

number of g forces = 2.61

Given:

• Length = 24 m

• Temperature, T1 = 8°C

• Expansion coefficient = 11 x 10⁻⁶(°C)⁻¹

Let's solve for the following:

• (a). The increase in length of the rail when the temperature is 36 °C

To find the increase in length, apply the formula:

Where:

Lo = 24 m

α = 11 x 10⁻⁶(°C)⁻¹

T2 = 36 °C

T1 = 8°C

Thus, we have:

The increase in length is 0.0074 m.

• (b). Let's calculate the thermal stress.

To find the thermal stress, we have the formula:

Where:

Y is the young modulus = 20 x 10¹⁰ N/m

dL is the change in length = 0.0074 m

L is the length = 24 m

Input values in the formula and solve:

The thermal stress is 6.17 x 10⁷ N/m².

ANSWER:

• (a). 0.0074 m.

• (b). 6.17 x 10⁷ N/m²

Answer:

1.332 N

Explanation:

Net Force = Mass x Acceleration
1.2 x 1.11 = 1.332 N

I'm so sorry if I'm wrong.

Answer:

d = rt

Explanation:

distance = ?

rate = 18 m/s

time = 42 x 60 = 2520 s

distance = 18 x 2520 = 45360 m

The total mechanical energy of a spaceship will be E = - GMm/2(R+h)

which is moving in circular orbit  at height R above the surface of a planet of mass M and radius R . Here, m is the mass of spaceship and G is gravitational force.

Therefore, when the engine of spaceship of mass (m) is switch offed and moving in circular orbit of a planet at height R above the surface of a planet of mass M and radius R then the mechanical energy is given by

E = - GMm/2(R+h)

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Given,

The mass of the object, m=2 kg

The applied force, F=15 N

The frictional force, f=5 N

The frictional force is a force that opposes the motion of an object. Hence it will be always be directed opposite to the direction of motion of the object.

The net force acting on the object is given by,

From Newton's second law of motion, the net force is given by,

Where a is the acceleration of the object.

Therefore,

On substituting the known values,

Therefore the acceleration of the object is 5 m/s²

In order to calculate the time needed, let's use the formula below:

Where P is the power in Watts, E is the energy/work in Joules and t is the time in seconds.

First, let's convert the energy from kJ to J (1 kJ = 1000 J):

So, for P = 400, we have:

Therefore the time needed is 750 seconds.

Answer:

For parallel plate capacitor ,the capacitance C=dAϵ0

Area, A=ϵ0Cd=8.85×10−121×10−3=1.13×108m2

Pls Check This Answer Is correct or not

actually i am not sure

The magnitud of an electric field is given as:

For the charge 1 the magnitude is:

Now, since charge 1 is negative this means that this field points towards the charge, in this case to the left, then the electric field for charge one is:

For the charge 2 the magnitude is:

Now, since charge 2 is positive this means that this field points away from the charge, in this case to the left, then the electric field for charge two is:

Now, the total field on point P is the sum of both electric fields, then the total electri field on this point is:

Given:

An object is placed in front of a concave mirror between the center of curvature of the mirror and its focal point.

To find:

The type of the image

Explanation:

The image is real if the rays after reflection from the mirror actually meet.

Here, the object is placed in front of a concave mirror between the center of curvature of the mirror and its focal point.

The rays after reflection actually meet. So, the image is real.

Hence, the image is real.

From the graph we notice that when the force is 3 N the acceleration is 0.6 meters per second per second.

Now, to find the mass we use Newton's second law:

for the point we found earlier we have:

Therefore the mass of the object is 5 kg