Pls answer this! it's urgent!

Answer:

See below

Explanation:

Using conservation of momentum:

Initial momentum = (77+32 kg)* 3.8  m/s = 414.2   kg m/s

Jumping off with zero speed relative to ground (I think this is what zero horizontal speed MEANS) means all of his momentum is given to the cart  ( think about jumping off of a skateboard)

  final momentum of the cart

      mv = 414.2

       v = 414.2/32 = 12.94 m/s    for a + 9.13 m/s change

According to the second law of Newton, the acceleration is directly proportional to the net force acting on the object:

From this formula, we can also see that the acceleration is inversely proportional to the mass: For the same force, if the mass increases, the acceleration decreases.

Therefore the correct option is d.

Answer:

Thus, even though the velocity of an object at rest must be zero, acceleration can clearly be non-zero for objects at rest. A particle that is thrown vertically upwards stops momentarily at the highest point of motion.

Answer:

Everything is zero. Because it's at rest.

The initial speed that the ball left the foot of the kicker if it was in the air for 4 seconds before hitting the ground 52 meters away is 23.64 m / s

T = 2 u sin θ / g

R = u cos θ * T

T = Total time of flight

u = Initial velocity

g = Acceleration due to gravity

R = Horizontal range

T = 4 s

R = 52 m

4 = 2 u sin θ / 9.8

u = 39.2 / 2 sin θ

u = 19.6 / sin θ → ( 1 )

52 = u cos θ * 4

u = 13 / cos θ → ( 2 )

Equating ( 1 ) and  ( 2 ),

19.6 / sin θ = 13 / cos θ

sin θ / cos θ = 19.6 / 13

tan θ = 1.5

θ = 56.3°

From ( 2 )

u = 13 / cos 56.3°

u = 13 / 0.55

u = 23.64 m / s

Therefore, the initial speed that the ball is 23.64 m / s

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We could  calculate the initial and final kinetic energy after computing the velocities prior to the impact. So, the total kinetic energy of the two people decrease during the collision by -638.73 J.

Since the velocity before to the collision is unknown, it is impossible to calculate the kinetic energy. So, we'll start by computing the velocities before to the impact.

If all external forces have a zero vector total, momentum is said to be conserved. In other terms, it may be said that the system's momentum prior to the collision and its after momentum should be identical.

This indicates that even if we know little or nothing about the internal forces of the system, we can still calculate the system's momentum.

The kinetic energy prior to and following the collision must be calculated in order to calculate the change in kinetic energy.

Due to the unknown velocity before to the contact, it is impossible to calculate the kinetic energy. As a result, we'll start by computing the velocities that existed before the impact.

The first step is to calculate the x and y components of the velocity following the collision. Sam might be represented by variable S, and Abigail by variable A.

v S = v S x + v S y = 6.00 m / s cos 37 + 6.00 m / s sin 37 v S = ( 4.79 I + 3.61 j ) m / s v A = v A x + v A y = 9.00 m/s cos 23 + 9.00 m/s sin 23 v A = ( 8.28 I + 3.52 j ) m / s

Then, keep in mind the equation for momentum conservation: p 1 = p 2

where p 1 represents the momentum prior to the collision and p 2 represents the momentum following the collision. Since Sam is sliding eastward before to the collision in the aforementioned scenario, we will only utilize the x component of the velocity after the collision of Sam and Abigail to compute the velocity of Sam before the collision, and we will also set Abigail's momentum to zero.

We could now calculate the initial and final kinetic energy after computing the velocities prior to the impact.

KE1=12mS(vS1)

2+12mA(vA1)

2=12(80 kg)(9.97 m/s)

2+12(50 kg)(2.26 m/s)

2KE1=4103.73 J

KE2=12mS(vS1)

2+12mA(vA1)

2=12(80 kg)(6.00 m/s)

2+12(50 kg)(9.00 m/s)

2\sKE2=3465 J

The difference between the end and starting kinetic energy could be used to calculate the change in kinetic energies.

KE= -638.73J

Complete question is:

You and your friends are doing physics experiments on a frozen pond that serves as a frictionless, horizontal surface. Sam, with mass 80.0 kg, is given a push and slides eastward. Abigail, with mass 50.0 kg, is sent sliding northward. They collide and after the collision, Sam is moving at 37.0 degrees north of east with a speed of 6.00m/s and Abigail is moving at an angle 23.0 degrees south of east with a speed of 9.00 m/s. By how much did the total kinetic energy of the two people decrease during the collision?

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Work is done on the mouse by air resistance 25.574 Joule.

Work is done every time a force moves something over a displacement. you can calculate the electricity transferred, or paintings done, by using multiplying the force via the gap moved in the course of the force. strength transferred = work achieved = pressure x distance moved within the direction of the pressure.

Work to be accomplished, a force must be exerted and there must be motion or displacement in the route of the pressure. The work done by way of a force appearing on an object is the same as the significance of the pressure accelerated by way of the space moved within the route of the force.

given,

mass = 27.0 g = 0.027 kg

Height H = 200 m

initial speed u = 0 m/s

final speed V = 8.1 m/s

force = mg

        = 0.027 × 9.8

         = 0.2646 N

1/2mu² + mgh = mgh + 1/2mv²

0 + 0.027×9.8 ×100 = 0 + 1/2×0.027× (8.1)² + air reesistance

initial energy = 26.46 J

final energy = 0.886 J

air resistance = 26.46 J - 0.886 J

                        = 25.574 Joule

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Answer:

The car must be moving at a changing velocity but at a constant speed. This is caused when an object is changing direction but not its speed.

Explanation:

Since velocity is a vector, it is measured with both magnitude (the numerical value) and direction. Acceleration is the change in velocity over a time period, which makes acceleration also a vector.

Speed is a scalar, so it is only measured by its magnitude (the numerical value). Speed only changes if you:

1. slow down
2. speed up

There are 3 ways an object can accelerate:
1. by slowing down
2. by speeding up
3. by changing direction (turning)

Since the speed is the same, that means the car can't be speeding up or slowing down. Therefore, the car must be turning direction with a constant speed.

Answer:

Explanation:

We have to use the equation p = I^2 x R. But we do not have the current.

To work out the current, we look at what we have. We have the voltage and power, therefore we will use the equation P = IV and rearrange to find the current.

I = P/V

I = 60/220

I = 0.2727272727 or round it to 2 dp to get = 0.27

we now have to rearrange the first equation to find the resistance.

R = P/I^2

R = 60/0.2727272727^2

R = 806.6666665501

R = 807 ohms (3sig)

The resistance of the filament is 806.67 ohms.

Electrical power is defined as the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is Watt, 1 joule per second ( 1J/S).

The formula of electrical power is

    P = V^2/R

where,

P = power

V = volts

R = resistance

from the above formula

60 = 220x220/R

R = 220x220/60

R = 806.67

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When electricity to an electromagnet is stopped the magnetic strength of the magnet will be lost.

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Answer:

u got to provide all info in order to be answered

Explanation:

The acceleration of the object is 4.48m/s².

From the graph we can see,

There are 5 dots placed over the line, it means that the object has moved for 5 seconds. The distance which the object has covered in 5 seconds is equal to about 56 meters.

As we know, the object is starting from rest, so the initial velocity is 0m/s.

Now, to find the acceleration a of the object, we can use the equations of motion.

So,

Using,

S = ut + 1/2at²

Where,

u is initial velocity,

S is the distance covered,

and t is the time period of motions of the object.

Putting all the values,

56 = 1/2a(5)²

(56 x 2)/25 = a

a = 4.48m/s²

Hence, the acceleration is 4.48m/s².

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The magnitude of the acceleration is  −0.50 m/s² of the block of mass 290kg that slides on a frictionless plane inclined at 39◦ with the horizontal under the influence of a restraining force of 1643 .

The resulting motion is

2. up the plane, since the acceleration is negative.

Acceleration describes the speed and direction changes in velocity over time. Acceleration refers to the change in speed or direction of an object or point moving straight ahead.

Due to the constant change in direction, motion on a circle accelerates even when the speed is constant. Both effects help to accelerate all other types of motion.

We have given that,

m = 290 kg

θ = 39◦

F = 1643 N

g = 9.8 m/s²

The force due to gravity

F₁ = m × g × sinθ

F₁ = 290 × 9.8 × sin 39°

F₁ = 1790.46 N

Lets take acceleration is a m/s²

Form Newtons second law

F - F₁ = m × a

1643 - 1790.46 = 290 x a

a = −0.50 m/s²

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A. Total momentum in a closed system is conserved

the law of momentum conservation states that The total amount of momentum before the collision is the same as the total momentum after the collision. Regardless of the change of momentum of each object.

Your community is considering building a dam on a nearby river to reduce flooding. yes, this proposal need support. because through dam we can store flood water.

A physical barrier known as a dam slows or limits the flow of surface or subsurface water. Reservoirs built by dams provide water for navigation, aquaculture, irrigation, human consumption, industrial use, and other purposes.

Let's examine some of a dam's uses now that we have a basic understanding of what a dam is. It is valued as a resource for water. They provide water for a variety of uses, including home, agricultural, and industrial ones. Dams are also utilised to produce energy and improve river transportation. Dams are used more and more frequently in daily life. Dams also promote local tourism, which contributes to the growth of the nation. Dams can be used for many different things.

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A model can be altered in a number of ways, by importing a database, combining information, or erasing data.

The term "scientific manipulation" in behavior analysis describes the methodical organization of a variable under research in order to enable the objective analysis of the effects of the variable presence or absence on some other measurable behavior.

To manipulate data, build a database with information from many sources, clean and rearrange the content of the database, combine and remove redundant information, and then do an analysis to uncover important information.

Understanding your needs and goals, utilizing automation tools, filtering your data, and researching various manipulation tools are some strategies for manipulating data.

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Results are never more exact than the least precise measurement. The average lap time surpasses clock precision.  I will have a fair amount of confidence in the results of the report

This is further explained below.

Generally, A result can never be more accurate than the measurement that was the least accurate.

The calculated average lap time is more accurate than the clock can measure.

A conclusion can never be more accurate than the measurements that were used to get at it. The accuracy that may be achieved with the clock is exceeded by the average lap time that was determined.

Hence, for a clock that bears a precision of 0.2 seconds, I will be confident in its results bearing precision in mind, Because knowing the precision you can easily manipulate the results to get the desired outcome

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According to the research, the correct option is moments of both forces are equal. In the principle of moments, both moments of forces are equal.

It states that the moment of a force about a point is equal to the sum of the moments of the components of the force about the point where two forces are equivalent when their effects on a rigid body are the same, that is, produce the same moment.

In this sense, two forces acting on an object are known as a couple whose torques about a point cause the object they act on to tend to rotate.

Therefore, we can conclude that following the equilibrium condition in the principle of moments, a structure of an object has to respond to the action of a moment with another of the same value and in the opposite direction.

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The force of friction impeding Matt's motion is 49.05 N.

What is friction?
When two surfaces move relative to each other, friction between them turns kinetic energy into thermal energy (that is, it converts work to heat). As demonstrated by the utilisation of friction caused by rubbing pieces of wood together to start a fire, this feature can have severe repercussions. When motion with friction occurs, such as when a viscous fluid is churned, kinetic energy is transformed to thermal energy. Another significant effect of many types of friction is wear, which can lead to performance degradation or component damage. The science of tribology includes friction.

The force of friction impeding Matt's motion down the banister can be calculated using the equation:
Ff = μN
where μ is the coefficient of sliding friction and
N is the normal force.
The normal force can be calculated using the equation:
N = mg sinθ
where m is the mass of the object, g is the acceleration due to gravity, and θ is the angle of incline.

Plugging in the known values, we get:

Ff = μN
Ff = (0.20)(50 kg)(9.81 m/s2)(sin 30.0°)
Ff = 49.05 N

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The coefficient of friction between the boy's shoes and the ice is 0.65.

The coefficient of static friction for ice is 0.65, so this means that 65% of the force needed to move an object from one place to another must be applied in order to get it moving across the ice at all—once it starts moving, however, there will be a lot less work required because we have already accounted for the initial force required to start moving it.

This means that if we want our boy running north at 5 meters per second across this large, flat lake with no wind or waves or anything else going on that might cause him trouble (or even help him), he'll need 10 meters per second or more just to get started.

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14.3 seconds before the plane is directly overhead should the box be dropped in projectile motion.

The motion of thebox is a projectile motion, therefore it consists of two independent motions:  

A uniform motion (at constant velocity) along the horizontal direction  

A uniformly accelerated motion, with constant acceleration (=acceleration of gravity, ) in the downward direction  

s = 1000 m is the vertical distance that the box must cover

u = 0 (the box's initial vertical velocity (zero, since it is travelling horizontally)

g is the acceleration of gravity

t is the time

The time the box needs to arrive at the ground is determined by solving for t:

[tex]t=\sqrt((2s/g=\sqrt((2(1000))/(9.8))=14.3s[/tex]

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Thus, the wavelength is 3.21 m when the frequency fm station broadcasts classical music is at  93.5 mHz.

A waveform signal's wavelength is defined as the separation between two identical points (adjacent crests) in adjacent cycles as the signal travels through space or along a wire. This length in wireless systems is typically expressed in metres (m), centimetres (cm), or millimetres (mm) (mm). It is more common to specify the wavelength in nanometers (nm), which are units of 10-9 m, or angstroms (), which are units of 10-10 m, for infrared (IR), visible light (VL), ultraviolet (UV), and gamma radiation ().

Frequency, or the quantity of wave cycles per second, is inversely related to wavelength. The wavelength of a signal decreases in length as its frequency increases. An electric field and a magnetic field vibrate together, producing an electromagnetic wave. A wavelength can be determined by dividing a wave's velocity by its frequency.

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Given data:

Mass of rock 1;

Height rock 1 lifted;

Mass of rock 2;

Height rock 2 lifted;

The work done in lifting the rock is given as,

Here, m is the mass of the rock, g is the acceleration due to gravity (g=10 m/s²) and h is the height the rock lifted.

The work done in lifting rock 1 is given as,

Substituting all known values,

The work done in lifting rock 2 is given as,

Substituting all known values,

On comparing the work done in lifting rock 1 and 2 we conclude that,

Therefore, the same amount of work is done in lifting a 50 kg rock by 2 meters and lifting a 25 kg rock by 4 meters.

ANSWER:

10.58 Nm

STEP-BY-STEP EXPLANATION:

Given:

Area (A) = 2.936 m²

Current (i) = 6.488 A

Magnetic field (B) = 1.108 T

Angle (θ)= 59.914°

To calculate the torque we must resort to the following formula:

We need to know the magnetic moment, as follows:

In this way we can calculate the torque:

Therefore, the magnitude of the torque on the loop is 10.58 Nm

Two forces 10N and 6N acts on an object in same direction , then the net force will be:

16N .

So here net force : F= F1 + F2.

Here,

F1 = 6 N

F2 = 10 N

F = 6N + 10N

F = 16N

∴ Net force = 16N .

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In order to determine the acceleration of the block, use the following formula:

Moreover, remind that for an object attached to a spring the magnitude of the force acting over a mass is given by:

Then, you have:

by solving for a, you obtain:

In this case, you have:

k: spring constant = 100N/m

m: mass of the block = 200g = 0.2kg

x: distance related to the equilibrium position = 14cm - 12cm = 2cm = 0.02m

Replace the previous values of the parameters into the expression for a:

Hence, the acceleration of the block is 10 m/s^2

The resultant velocity of the plane has a magnitude  104.4  mph and direction    south of west .

The plane is flying south at a speed of  100  mph and is blown by a  30mps strong wind due west.

⇒  The angle between the direction of flight of plane and the direction of the wind is  90° .

⇒  By Pythagoras theorem, the resultant speed is

[tex]\sqrt{100^{2} +30^{2} } =\sqrt{10900}[/tex] =104.4 mph

⇒  The resultant velocity of the plane has a magnitude  104.4  mph and direction    south of west

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The answer is dy/dt is equal to -(20/7)(1/14)(0.6) = -0.12245 m/s.

The negative sign shows that the rate is falling as y gets shorter

.Woman Height/ Distance Light To Woman equals

Shadow Height/Distance Light To Wall.

explanation?

Think of a huge triangle with the origin as the spotlight, a base of 20, and the height of the shadow on the wall as y. Inside the larger triangle, a comparable triangle that is x meters from the spotlight and 2 meters

tall—the woman's height—can be seen.

Woman Height/ Distance Light To Woman equals

Shadow Height/Distance Light To Wall.

The shadow height is y. Let x be the distance from the woman to the light.

xy = 40 or y/20 = 2/x

Take both sides' derivative:

XDY + YDX = 0 based on the product rule.

Solve for the desired result, dy/dy:

dy/dt = -(y/x)dx/dt, where dx/dt = 0.6 m/s.

The woman is 20 - 6 meters from the light when she is 6 meters from the wall, which is 14 meters, or x.

Keep in mind that y/20 = 2/x = 2/14 --> y = 40/14 = 20/7 from the related triangles.

So, dy/dt is equal to -(20/7)(1/14)(0.6) = -0.12245 m/s.

The negative sign shows that the rate is falling as y gets shorter.

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When a single photon has an energy of 2.23*10-21, light has a frequency of *E=hv 2.23 10-21 J = (6.626... 3.03 10-19 J (6.022*1023 photons).

A photon is a tiny energy packet of electromagnetic radiation, also referred to as a light quantum.

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