Newton's third law states that when an object exerts a force on another object, the second object exerts an equal but opposite force on the first object. Which of the following shows an example of this?
a. A bumper car crashes into a wall, causing it to bounce backwards.
b. A woman presses on both sides of a box with equal force.
c. A moving cart becomes more difficult to stop as more mass is added to it.
d. A parked car sits in the same place for two weeks until another car runs into the back of it.

Answer

'D. 18 feet' sounds right

B. 4.5 feet is the correct answer

The superior and inferior vena cava are the two main blood vessels that bring de-oxygentated blood back to the heart after the blood's done a circuit of the body to offload its oxygen to organs and muscles and tissues and cells, etc. The blood from these vessels enters the right atrium of the heart. Once the atrium is full of blood it contracts, pushing the blood through the open tricuspid valve into the right ventricle of the heart. The tricuspid valve closes shut once the blood is in the right ventricle, preventing the blood from returning to the right atrium. While the valve is closed, the ventricle contracts, pushing the blood out of the heart through the pulmonic valve, into the pulmonary artery, where it is carried directly to the lungs where it gets a new supply of oxygen attached to it. The freshly oxygenated blood courses along the pulmonary vein from the lungs back to the heart, entering the heart's left atrium. When the left atrium is full of blood, it empties by contraction, through the open mitral valve, into the left ventricle of the heart. The mitral valve then closes, so the blood cannot retrace its path. The left ventricle then contracts, pushing the blood out of the heart through the aortic valve into the big blood vessel called the aorta, from where it courses round the body delivering oxygen again.

Answer:

Explanation:

The acceleration of the fighter jet is calculated by taking the change in velocity (75 m/s - 10 m/s) divided by the time (7.0 s), which equals 9.29 m/s².

The acceleration of a fighter jet can be calculated using the formula a = Δv/Δt, where a is acceleration, Δv is the change in velocity, and Δt is the change in time. The jet accelerates from an initial velocity (vi) of 10 m/s to a final velocity (vf) of 75 m/s in a time interval (Δt) of 7.0 s. Therefore, the acceleration can be calculated as follows:

a = (vf - vi) / Δt = (75 m/s - 10 m/s) / 7.0 s = 65 m/s / 7.0 s = 9.29 m/s2

So, the acceleration of the jet is 9.29 m/s2.

It's POTABLE water, not 'portable'.

It's water that's safe to drink and tastes OK.

First overtone of open organ pipe is given as

[tex]f_{1o} = \frac{v}{L_1 + 2e}[/tex]

first overtone of closed organ pipe is given as

[tex]f_{1c} = \frac{3v}{4(L_2 + e)}[/tex]

now they are in unison so we will have

[tex]\frac{v}{L_1 + 2e} = \frac{3v}{4(L_2 + e)}[/tex]

[tex]\frac{1}{30 + 2e} = \frac{3}{4(23 + e)}[/tex]

[tex]90 + 6e = 92 + 4e [/tex]

[tex]e = 1 cm[/tex]

so end correction of both pipes is e = 1 cm

This can be viewed as a decrease in the wavelength of the wave. A decrease in wavelength at a constant speed is associated with an increase in frequency since waves follow the equation v=f*λ, where λ is the wavelength and f is the frequency.

N₀ = number of radioactive atoms initially present = 128

N = number of radioactive atoms left after time "t" = 2

t = time taken

T = half life period for the radioactive metal = 20 years

λ = decay constant = ?

decay constant is given as

λ = 0.693/T

inserting the values

λ = 0.693/20

λ = 0.0347

number of radioactive atoms left after time "t" is given as

N = N₀ [tex]e^{-\lambda t}[/tex]

inserting the values

2 = (128) [tex]e^{-(0.0347) t}[/tex]

t = 120 years

Answer:

(C) (see image of it attached)

Answer: circuit C

Explanation:

A DC voltage source supplies current in single direction. It is represented by alternate small and big straight lines.

An Ac voltage source supplies alternating current i.e. the current changes direction.

In the given circuit diagrams, only circuit C has a DC voltage source.

The initial speed doesn’t matter.  To reach the maximum height, you need to launch straight up ... 90 degrees above horizontal.

Answer:

90 degree

Explanation:

The height for the projectile motion is given by

H = u^2 Sin^2 theta/ 2g

Height is maximum when sin theta is maximum.

Sin theta is maximum when it's value is 1.

So the value of theta is 90 degree.

My answer choice would be A. Cypress Tree

Answer: A :)

Explanation:

Ap*x

The spaceship is either not moving and is in its launch pad here on earth and the water is behaving as it would anywhere else on our planet

or

the spaceship is in outer space somewhere and it has fired up its thrusters and it has created it's own gravitational Force because it is accelerating

or

the spaceship is trying to land on another planet and is slowly coming to the surface of the planet

or

the spaceship is taking off from a planet and the gravitation force of the planet is still in effect.

Answer:

Based on the principle of equivalence, the motion and location of the spaceship are unknown.

The ship may be accelerating in space, where the floor rises up to the water.

The spaceship may be stationary on Earth, where gravity causes the water to fall to the floor.

Explanation:

The correct answer should be A. sea levels rising should not be a part of sea-floor spreading.

Hope this helps,

Davinia.

A. sea levels rising

and thats a fact!

The answer is option d... All of the above..

the answer is B a freckle I just had this as a Study Island and got it right.

Ans. (B). a freckle.

Sunspots can be defined as temporary phenomena on the photosphere of sun, which appears as spot darker than its surrounding regions. Freckles on the face can model the behavior of sunspots are they represent spots brown spots on skin, darker than face complexion.

Freckles are resulted due to concentrated melaninized cells, having melanin (a type of skin pigment).

Thus, the correct answer is option (B).

the ball's momentum is 10 × 1.5 = 15 kg m/s

Answer : The momentum of ball is, 15 kg.m/s

Explanation :

Momentum : It is defined as the motion of a moving body. Or it is defined as the product of mass of velocity of an object.

Formula of momentum is:

[tex]p=mv[/tex]

where,  

p = momentum  = ?

m = mass  = 1.5 kg

v = velocity = 10 m/s

Now put all the given values in the above formula, we get:

[tex]p=(1.5kg)\times (10m/s)[/tex]

[tex]p=15kg.m/s[/tex]

Therefore, the momentum of ball is 15 kg.m/s

Given that:

Ball dropped from a bridge at the rate of 3 seconds

Determine the height of fall (S) = ?

      As we know that, S = ut + 1/2 ×a.t²

                          u =initial velocity = 0

                          a= g =9.81 m/s  (since free fall)

                            S = 0+ 1/2 × 9.81 × 3²

                          S = 44.145 m

44.145 m far is the bridge from water

The answer is Radio Waves

Answer:  176.4 Joules

Explanation: Potential energy of a body is defined as the energy possessed by virtue of position.

Potential energy [tex]=m\times g\times h[/tex]

m = mass of the body = 6 kg

g = acceleration due to gravity = [tex]9.8 ms^{-2}[/tex]

h = height of body = 3 m

Potential energy [tex]=6 kg\times 9.8ms^{-2}\times 3m=176.4kgm^2s^{-2}[/tex]

= 176.4Joules                 {[tex]1kgm^2s^{-2}=1Joule[/tex]}

Question: Two 1-kg point masses a distance d apart each exert a gravitational attraction F on the other one. If 1 kg is now added to each mass, the gravitational attraction exerted by each will be

Answer: 4f

Explanation:  a gravitational force is propotional to a square of distance between two point masses so we separate the masses to a distance

question answered by

(jacemorris04)

We know that the gravitational force is proportional to (m₁) · (m₂).

Now we want to know the force between (2·m₁) · (2·m₂).

Well, that's just the same as (2·2) · (m₁)·(m₂), which is  4 · (m₁)·(m₂) ... four times the original force.

So in this question, the new pair of gravitational forces will be 4·F in each direction.

0 (zero) work done.

This is because work can be calculated by:

Work = Force × Distance

The force is 100 N and since the rock didn't move the distance is zero and so:

Work = 100 × 0 = 0 J

The amount of work done by the man on the rock will be

0 joules.

In physics, work is defined as the product of force and the displacement caused by it. Mathematically -

W = FdcosФ

Ф is the angle between 'F' and 'd' vector.

Given is a man who applies a force of 100 N to a rock for 60 seconds but the rock does not move.

Since, the rock did not move, the displacement of the rock will be zero i.e. d = 0. Therefore, the work don will be -

W = F x 0 x cosФ = 0

Therefore, the amount of work done by the man on the rock will be

0 joules.

To solve more questions on Work done, visit the link below-

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Given that:

Mass (m) = 20 g = 0.02 Kg,

temperature (T₁) = -10°C = -10+273 = 263 K

temperature (T₂) = 10°C = 10+273 = 283 K

Specific heat of water (Cp) = 4.187 KJ/Kg k

We know that Heat transfer (Q) = m. Cp.( T₂ - T₁)

                                                    = 0.02 × 4.187 × (283-263)

                                                 Q = 1.67 KJ

Heat transferred is 1.67 KJ

It is because of the differences in specific heats. The specific heat of water is much higher than that of lead. It takes more heat to raise water to a boiling point and keep it there than it takes lead to maintain a temperature of of 300oC.

It's all due to specific heat. The answer, though poorly worded, is the last choice.

Answer:

because water's specific heat is much greater than that of lead, therefore this amount of lead cannot contain as much heat.

Answer:

3.339 N

Explanation:

In this problem, the box is moving at constant velocity, so the box is in motion and therefore we can consider only the kinetic friction.

The resultant of the forces acting on the box must be equal to the product of mass and acceleration:

[tex]F_{net}=ma[/tex]

However, the box is moving at constant velocity, so the acceleration is zero: a=0. Therefore,

[tex]F_{net}=0[/tex] (1)

There are two forces acting on the box:

- The push: F

- The kinetic friction on the box, equal to

[tex]-\mu_k mg[/tex]

where [tex]\mu_k = 0.1113[/tex] is the coefficient of kinetic friction and (mg)=30 N is the weigth of the box, and where the negative sign means it is in the opposite direction of the motion.

Therefore, eq.(1) becomes

[tex]F-\mu mg =0\\F= \mu mg=(0.1113)(30 N)=3.339 N[/tex]

Answer:

Gravity pulls objects toward Earth.

The rate of acceleration due to gravity is 9.8 m/s2.

Weight on Earth’s surface is a result of gravity’s pull.

Explanation:

these are the answers for e2020

Gravity is a fundamental force that gives weight to objects and causes freefall. On Earth, it also causes the ocean tides and affects time, making it pass slower closer to Earth's surface. In our universe, it plays a vital role in the dynamics of celestial bodies.

Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. It is mathematically described as: F = G *(m1*m2)/r^2 where F is the force of attraction between the two bodies, m1 and m2 are the two masses, r is the distance between the centers of the two masses and G is the gravitational constant.

On Earth, gravity gives weight to physical objects and causes the ocean tides. The force of Earth's gravity comes from the object's mass and the acceleration due to gravity, which is approximately 9.8 m/s^2 at sea level. When an object is in freefall, the only force acting upon it is gravity.

Gravity also affects time and space, causing time to pass more slowly closer to the surface of the Earth compared to further away. This concept is known as time dilation. In essence, gravity is a crucial force that plays a key role in the structure and lifecycle of planets and the orbital movement of celestial bodies.

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Answer: 2 N/cm  (B)

Given that:

Spring stretches = 2 cm ,

Force  = 4 N,

determine

            the spring constant/elastic constant ( k)= ?

            We know that from hook's law, F = k.x  N

                                                                 4 = k × 2

                                                                => k  =4/2

                                                                         = 2 N/cm

The elastic constant is 2 N/cm

Answer:

4 Ohms

Explanation:

The challenging part in this circuit is the bridged setup (diamond-shaped arrangement made of the 4 Ohm resistors). In general, this would first need to be transformed using the Wye-Delta transform to be solved, but in this case we can make a valid simplification: since the diamond arrangement is completely symmetrical, the voltage at the top and the bottom tip of the "diamond" will be identical and no current flows through the 4 Ohm bridge, hence, this resistor can be removed without changing the resulting resistance. After this, it is easy to see that the equivalent resistance of the modified "diamond" is just 4 Ohms.

The remaining top parallel branch of the circuit will be 8 Ohms, and the bottom parallel branch is nominally 8 Ohms. The resulting resistance therefore is 4 Ohms.

(The answer is not 2 Ohms!)

Answer:

16.935 N

Explanation:

In order to make the box start moving, the level force applied on the box (F) must be greater than the force of static friction that keeps the box at rest, which is equal to

[tex]F_f = \mu_s (mg)[/tex]

where

[tex]\mu_s = 0.5645[/tex] is the coefficient of static friction

(mg) = 30 N is the weight of the box

Therefore, the condition for F must be:

[tex]F \geq F_f\\F \geq \mu_k (mg)=(0.5645)(30 N)=16.935 N[/tex]

So, the applied force must be greater than this value.

C,  t=3.4s. The velocity of the car increases as you go up the y axis

3.4 is the max value of speed from curve and v axis