A mass is dropped from a height h above the ground, and freely falls under the influence of gravity. Which graphs here correctly describes the displacement and velocity of the object during the time the object is falling? Consider the "up" direction to be positive.

Which graph is it?​

Answer:

Earth is slightly closer to the Sun in December than it is in June. The force of gravity is slightly smaller

Explanation:

Answer: The ballon could get rub on a carpet to gain electricity and it would have enoght force

Explanation:

Answer:

The current through all of the resistors will add up to 10 A.

Explanation:

Answer:

Explanation:

the answer is gallons because i got it right on the exam

Answer:

C. It will move away from the second magnet because like poles repel.

Explanation:

Answer:

C

Explanation:

Answer:

He was scared

Explanation:

Answer:

He Feared persecution .

Explanation:

Answer:

sorry im not in physics

Explanation:

Answer: D. the Schachter-Singer theory

Explanation:

The Schachter-Singer theory which is also called the Two-factor theory of emotion, explains that humans feel emotion after they appraise the changes in their body in reaction to a stimuli as this would then give them a better means to tell which emotion they are feeling.

Lynette in the first instance noticed she had a racing heart and rapid breathing in response to watching two other players and was then able to appraise this and attribute it to excitement.

When the same thing occurs again but under different circumstances, she is able to appraise it differently and attribute it to nervousness which shows that the Schachter-Singer theory is the relevant theory.

Answer:

vx = 65 yd/3 sec  = 21.7 yd/sec  since horizontal speed is constant

vy = g t = (32 / 3) yd/sec^2 * 1.5 sec = 16 yd/sec   where 32/3 is the acceleration due to gravity in yds / sec^2  and 1.5 is the time to travel each way in the vertical direction

V = (vx^2 + vy^2)^1/2 = (21.7^2 + 16^2)^1/2 = 27 yd/sec

tan theta = vy/vx = 16 / 21.7 = .737    theta = 36.4 deg

You can check using the range formula:

R = v^2 sin (2 theta) / g = 27^2 * .955 / (32 / 3) = 65.3 yds  

The difference from 65 yds may be rounding error.

Given : A toy plane has a mass of 1.5kg . It is flying in air at a speed of 8m/s .

To Find : The Kinetic energy of the plane .

Solution : The mass of the toy plane is 1.5kg and Velocity is 8.0 m / s . So we know the formula to find the kinetic energy as ,

[tex]\boxed{\red{\bf Energy_{Kinetic}=\dfrac{1}{2}mv^2}}[/tex]

On substituting the respective values,

⇒ KE = ½mv².

⇒ KE = ½ × 1.5 kg × (8 m/s)².

⇒ KE = ½ × 1.5 kg × 64m²/s² .

⇒ KE = 48 J .

Hence the Kinetic energy of the plane is 48Joules.

The kinetic energy of a plane having a mass of 1.5 kg flying in the air at 8.0 m / s is 48 J.

Kinetic energy is a type of power that a moving object or particle possesses. When an object undergoes work, which involves the transfer of energy, by exerting a net force, the object accelerates and consequently obtains kinetic energy.

A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion. The type of motion can be vibration, rotation on an axis, translation (or travel along a path from one place to another), or any combination of these.

Given:

The mass of the toy plane, m = 1.5 kg,

The velocity of the toy plane, v = 8 m / s,

Calculate the kinetic energy by the formula given below,

[tex]KE = 1/2mv^2[/tex]

Substitute the values,

KE = 1 / 2 × 1.5 × 8²

KE = 1 / 2 × 1.5 × 64

KE = 48 J

Therefore, the kinetic energy of a plane having a mass of 1.5 kg flying in the air at 8.0 m / s is 48 J.

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the answer is B your welcome

The  true statement about a series circuit is: the current flow through every part of the circuit is the same. Hence, option (B) is correct.

Electrical networks and two-terminal components can be linked either serially or parallelly. The electrical network that results will have two terminals and be capable of operating in either a series or parallel topology.

It depends on your point of view whether a two-terminal "thing" is an electrical network (like resistors connected in series) or an electrical component (like a resistor). In this article, a two-terminal "thing" that participates in series/parallel networks will be referred to as a "component."

Each component connected in series travels the same "electrical path" and carries the same amount of current—equal to the network's current—through it.

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Answer:

Explanation:

An x-ray emits radiation to see through the outer part of your body.

Hope this helps! <3

An X-ray is a type of radiation which is a type of electromagnetic radiation in the electromagnetic spectrum.

The  electromagnetic spectrum consists of electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.There are 7 types of electromagnetic radiation in the electromagnetic spectrum.Gamma rays have the highest energy while radio waves have least energy.

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Answer:

0.36 kgm/s

Explanation:

Formula for momentum is :

P=mv

p is momentum

m is mass = 30g = 0.03kg

v is velocity = 12 m/s

P= 0.03 x 12

P = 0.36 kgm/s

Explanation:

Initial speed, u = 0 km/h

Final sped, v = 50 km/h

Time, t = 8 s

1 minute = 60 seconds

⇒ 1 s = (1/60) minutes

⇒8 s = 0.1334 minutes

Acceleration,

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{50\cdot\dfrac{5}{18}}{8}\\\\a=1.73\ m/s^2[/tex]

Hence, this is the required solution.

Harmonics, Loop and Harmonic number

Hope this helps :)

Answer:

See attached answer.

Explanation:

To solve this we must be knowing each and every concept related to displacement and its calculations. Therefore, the ride's displacement from time t = 0 s to time t = 16 s is 16v.

The distance along a straight line connecting an object's original and final positions is its displacement [x].

Displacements are not always a good thing. It may also be 0 or negative. A negative displacement indicates that the item has moved away from the origin and toward the right if a positive direction is situated to the right of both the origin.

If the body's velocity at a given moment in time is 'v' m/s, then displacement may be expressed mathematically as-

v = dx /dt

dx = vdt

Integrating on both sides, we get

∫dx = ∫vdt

∫dx  [x = 0 to x = x] = ∫vdt  [ t = 0 to t = 16 s]

x = v [16 - 0]

x = 16v

Therefore, the ride's displacement from time t = 0 s to time t = 16 s is 16v.

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Answer:

Properties of a photon would be:

Explanation:

Remember that photons are a quantum of light that carry energy while having no mass, they're used mainly in cameras and in other machinery that helps emit radiation.

Hope this helps.

Answer:

The nucleus has an overall positive charge as it contains the protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

Explanation:

Given parameters:

Speed of car = 50m/s

Time of travel = 5minutes (300s)

Unknown;

Distance of travel = ?

To solve this problem, we need to understand how speed relates with distance and time.

 Speed is a physical quantity. It is the distance traveled divided by time taken.

                Speed  = [tex]\frac{distance}{time}[/tex]

   So,

                Distance  =  speed x time

Input the parameters and solve for the distance;

               Distance  = 50m/s x 300s

               Distance  = 15000m

The distance covered during this time interval and speed is 15000m

Answer:

I am not very sure of the first question

The second one which is why it discarted it is that because someone named Friedrich Wohler showed that it was possible to obtain an organic compound in the laboratory.

Answer:

t = 2.97[s]

Explanation:

To solve this problem we must use the following kinematics equations, we must bear in mind that the positive sign of the acceleration value means that the car is increased its speed.

[tex]v_{f}^{2} =v_{o}^{2} +(2*a*(x-x_{o} ))[/tex]

where:

x - xo = 180 [ft]

a = acceleration [ft/s^2]

Vo = initial velocity = 53 [ft/s]

Vf = final velocity = 68 [ft/s]

Now replacing we find:

(68^2) = (53^2) + (2*a*180)

a = 5.04 [ft/s^2]

Now using the following equation:

[tex]v_{f}=v_{0}+a*t[/tex]

68 = 53 + (5.04*t)

t = (68 - 53)/5.04

t = 2.97[s]

Answer: False

Explanation:

Hi, I hope this helps!

During cellular respiration, glucose reacts with oxygen to produce carbon dioxide, water and energy.

Answer: False

Explanation:

1/Rt = 1/R1 + 1/R2 + 1/R3+ 1/R4+ 1/R5

1/Rt = 1/6+ 1/6+1/6+1/6+1/6

1/Rt = 5/6

Rt = 6/5

Rt = 1.2 ohm

so B is the answer

Answer:

The correct option is;

A) It is the only force acting on the block that is causes by microscopic interactions

Explanation:

The force of friction is the force due to the relative motion of two surfaces in the presence of a perpendicular force acting between the surfaces.

The force of friction comes into play from the additional effect of the adhesion that is present between surfaces, the roughness of the surfaces, the contamination or deformation of the surfaces which is generated by the microscopic interactions be between the two surfaces, rather than the applied force.

The characteristics of the friction force, you can find which statements are correct:

   D) It is the sum of all the microscopic contact forces between the bottom of the block and the surface.

The force is an image of the interactions between bodies, these interactions create binding energy that can be formed and broken, the friction force is the macroscopic sum of all these microscopic interactions between two different surfaces.

The magnitude of the friction force depends on the type of each surface, on rough surfaces the interaction area is high, therefore the friction force is high, on smooth surfaces the interaction area is small, therefore the force is small, a way to create superficiality is to place a layer of air between the two surfaces.

Based on these explanations, let's review the different statements:

A) False. The friction forces are caused by interaction, but between two bodies not within the same body, this is what maintains the shape and volume of the body.

B) False. The contact area depends on each surface and therefore each type of material

C) False. The gravitational force is this in the line of interaction between the two bodies, in this case the force is perpendicular to movement, not in the line of interaction.

D) True. It is the sum of the interactions in the contact between the two bodies, it agrees with the explanation above.

Using the characteristics of the friction force, we can find the statements that are correct is:

   D)  It is the sum of all the microscopic contact forces between the bottom of the block and the surface.

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Answer:

Total distance traveled by bird is 10.5 km.

Explanation:

Given that,

Velocity of runner= 8.4 km/hr

Distance = 6.3 km

Velocity of bird = 42 km/hr

Suppose, How far does the bird travel?

We need to calculate the time of bird

Using formula of time

[tex]t=\dfrac{d}{v_{b}}[/tex]

Put the value into the formula

[tex]t=\dfrac{6.3}{42}[/tex]

[tex]t=0.15\ hr[/tex]

We need to calculate the distance runner travels during time period

Using formula of distance

[tex]d=v_{r}\times t[/tex]

[tex]d=8.4\times0.15[/tex]

[tex]d=1.26\ km[/tex]

We need to calculate the distance of runner to FL

Using distance

[tex]d'=6.3-1.26[/tex]

[tex]d'=5.04\ km[/tex]

We need to calculate the net closing speed between runner and bird

Using speed

[tex]v'=v_{r}+v_{b}[/tex]

[tex]v'=8.4+42[/tex]

[tex]v'=50.4\ km/hr[/tex]

We need to calculate the time for runner and bird to meet

Using formula of time

[tex]t=\dfrac{d}{v'}[/tex]

Put the value into the formula

[tex]t=\dfrac{5.04}{50.4}[/tex]

[tex]t=0.1\ hr[/tex]

We need to calculate the distance covered by runner

Using formula of distance

[tex]d=vt[/tex]

Put the value into the formula

[tex]d=8.4\times0.1[/tex]

[tex]d=0.84\ km[/tex]

We need to calculate the distance covered by bird to runner

Using formula of distance

[tex]d=vt[/tex]

Put the value into the formula

[tex]d=42\times0.1[/tex]

[tex]d=4.2\ km[/tex]

We need to calculate the total distance

Using distance

[tex]D=6.3+4.2[/tex]

[tex]D=10.5\ km[/tex]  

Hence, Total distance traveled by bird is 10.5 km.

Answer:

27000 meters

Explanation:

15 x 60 x 30

It's Action and Reaction