If a velocity-time graph is horizontal, then acceleration is
a
zero.
b
positive
С
less than 1.
d
none of the above

Answer:

If you break a rib in the middle of your rib cage, the sharp end of bone could puncture a lung. If you break a rib toward the bottom of your rib cage, the sharp end of the bone could cause damage to your liver, kidney, or spleen.

Explanation:

Hope this helped..

Answer:

It ran at an average of 2 meters per second.

Explanation:

Answer:

If the body is in equilibrium the two forces add up and the third is the opposite of the resultant.

F(1x)=F(1)=10 N

F(2x)=F(2)cos60=5•0.5=2.5 N

F(2y) =F(2)sin60 = 5•0.866= 4.33 N

F(3x) =- F(x)=- (10+2.5 )= -12.5 N

F(3y) =- F(2y)= - 4.33 N

F(3) = sqrt{ F(3x)²+F(3y)²} =13.23 N

tan φ = F(3y)/F(3x) =4.33/12.5=0.364

φ = 19.1⁰ (south-west)

Explanation:

Answer:

hope that helps

Explanation:

sound energy to chemical energy.

electrical energy to sound energy.

sound energy to electrical energy.

Answer:

0.3 hour

Explanation:

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

Distance travelled = 90 km

Speed of 1st car = 50 km/h

Speed of 2nd car = 60 km/h

Time interval separating the two cars =?

Next, we shall determine the time taken for each car to get to the destination. This can be obtained as follow:

For the 1st car:

Distance travelled (d) = 90 km

Speed of 1st car (S₁) = 50 km/h

Time (t₁) =?

Speed = Distance /time

S₁ = d/t₁

50 = 90 / t₁

Cross multiply

50 × t₁ = 90

Divide both side by 50

t₁ = 90 / 50

t₁ = 1.8 hours

For the 2nd car:

Distance travelled (d) = 90 km

Speed of 2nd car (S₂) = 60 km/h

Time (t₂) =?

Speed = Distance /time

S₂ = d/t₂

60 = 90 / t₂

Cross multiply

60 × t₂ = 90

Divide both side by 60

t₂ = 90 / 60

t₂ = 1.5 hours

Finally, we shall determine the time interval separating the arrival of the two cars. This can be obtained as follow:

Time for the 1st car (t₁) = 1.8 hours

Time for the 2nd (t₂) = 1.5 hours

Time interval separating the two cars (tₛ) =?

tₛ = t₁ – t₂

tₛ = 1.8 – 1.5

tₛ = 0.3 h

Thus, the interval separating the arrival of the two cars is 0.3 hour

Answer:

yesssssssssssssssssssssssssssssssssssss

Answer:

The resultant force is the single force that would produce the same effect on an object as two or more forces that are applied to the object. To find the resultant force, first draw a free body diagram, which is a diagram that shows all the applied forces using arrows in the direction of each force.

Answer:

Increased lean muscle tissue.

Explanation:

I hope this helps :) Tell me if I am wrong!

Answer:

Increased lean muscle tissue.

Explanation:

i took the test!

Answer:

unbalanced 1st answer

Answer:

hi, your answers are correct

Explanation:

Answer:

A. Crust

B. Mantle

C. Outer Core

D. Inner Core

Explanation:

Answer:

A. Crust

B. mantle

C. outer core

D. inner core

Explanation:

because it is

Answer:

I think the answer is D...

Explanation:

Answer:

really fast? xP

Explanation:

[tex] \bf \underline{Given :-}[/tex]

[tex] \sf{• \: An  \: electric \:  heater \:  draws  \: a  \: current  \: of  \: 5  \: ampere \:  from \:  220  \: volt \:  supply.}[/tex]

[tex] \\ [/tex]

[tex]\bf{ \underline{To \:  Find:- }}[/tex]

[tex] \sf• \: ( a)  \: lts  \: resistance.[/tex]

[tex] \sf• \: (b) \:  electrical  \: energy  \: consumed  \: in \:  kwh \:  if  \: it  \: is  \: used  \: for \:  4  \: hours.[/tex]

[tex] \\ [/tex]

[tex]\huge\bf{ \underline{ Solution :-}}[/tex]

[tex] { \boxed{\bf{(a)}}}[/tex]

[tex] \sf•  \: Current  \: (I) = 5 \: A[/tex]

[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]

[tex] \bf \red{\bigstar{\: Formula \:  of \:  Resistance \: (R) =  \frac{V}{I} }}[/tex]

[tex] \sf \rightarrow  R = \frac{220}{5} [/tex]

[tex] \sf \rightarrow R =44[/tex]

[tex] \bf{Hence,  \: it's  \: resistance \:  is  \:  \: 44 \:  Ω \: .}[/tex]

[tex] \\  \\ [/tex]

[tex] { \boxed{\bf{(b)}}}[/tex]

[tex] \sf•  \: Current  \: (I) = 5 \: A[/tex]

[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]

[tex] \bf \red{\bigstar{\: Formula  \: of \:  Electric  \: Power \:  (P) = IV  }}[/tex]

[tex] \sf \rightarrow P = (5  \times 220) [/tex]

[tex] \sf \rightarrow P = 1100 \:[/tex]

[tex] \\ [/tex]

[tex] \sf \therefore \: P = 1100 \: watt[/tex]

[tex] \sf{• \: Time  \: (t) = 4  \: hours }[/tex]

[tex] \bf \red{\bigstar{ \: Formula  \: of  \: Energy  \: (W) = Pt}}[/tex]

[tex] \sf \rightarrow W= 1100  \times  4[/tex]

[tex] \sf \rightarrow W = 4400[/tex]

[tex] \sf \rightarrow W  =  \frac{4400}{1000} [/tex]

[tex] \sf \rightarrow W  =  4.4[/tex]

[tex] \sf \therefore W  =  4.4 \: kwh[/tex]

[tex] \bf{Hence,  \: Electrical  \: Energy \:  is \:  4.4  \: kwh.}[/tex]

Answer is 4.4 kwh.

hope it helps you.

Answer:

Explanation:

Let lift force F be created by propellers at angle of Ф with the horizontal .

The vertical component of this force will balance the weight of helicopter and horizontal component will balance the air resistance .

F sinФ = mg = 2750 x 9.8 = 26950 N

F cosФ = 7510 N

Squaring and adding ,

F² = 26950² + 7510²

= 726302500 + 56400100

= 782702600

F = 27976.82 N .

[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]

An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. ... In the absence of any forces, no force is required to keep an object moving.

In everyday situations, it does seem that a force is needed to keep an object moving at a constant speed in a straight line because the resistive frictional force acted on every objects against their motion.

The resistance provided by surfaces in touch as they move past one another is known as friction.

According to Newton's first law of motion, Unless forced to change its condition by an outside force, every object will continue to be at rest or moving uniformly in a straight line.

But in  everyday situations, it does seem that a force is needed to keep an object, for example the shopping trolley, moving at a constant speed in a straight line because of the frictional resistive force acting opposite to the motion. That's why, a force of equal magnitude and opposite direction must be applied on the object, so that, resultant force becomes zero. It can at a constant speed in a straight line.

Learn more about friction here:

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Answer:

8 minutes and 20 seconds

Explanation:

5000/10 to get the number of seconds, which is 500, then you convert 500 seconds to minutes and you get 8 minutes and 20 seconds

Answer:Aplitude

Explanation:

a p e x

Answer:

Electromagnetic

Explanation:

Electromagnetic waves are those waves that do not require any material medium for propagation. They arise from a vibration of electric and magnetic fields.

The electromagnetic spectrum is comprised of many waves. One of the waves in the spectrum is visible light.

Visible light is in turn composed of seven different wavelengths of which green light is one of them. Hence, green light travels by electromagetic wave.

Explanation:

The reason time zones are 15 degrees wide is because there are 24 hours and 360/24 = 15. As you move east by 15 degrees the sun’s position in the sky changes relative to us and it looks an hour later in the day, so we advance our clocks to match the sun’s position.

So every 15° eastward one hour ahead.

battery

Explanation:

Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil

Answer:

Light Bulb

Explanation:

I did the quiz and i got it right

Answer:

2 or more atoms

Explanation:

yes yes yes yes yes yes yes yes

Answer:

Two or more

Explanation:

It's mostly two but unique structures might compose of more than 2

Answer:

400 kN

Explanation:

El principio de Arquímedes establece que, cuando un cuerpo está total o parcialmente sumergido en un fluido, experimenta un empuje hacia arriba que es igual al peso del fluido desplazado.

Dado que;

Volumen del bloque = 80m ^ 3

Densidad del agua = 1000 kg / m ^ 3

Empuje hacia arriba = 1/2 * 80 * 1000 * 10

Empuje hacia arriba = 400 kN

Answer:

It is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle is not constant

Explanation:

The motion of a particle under constant acceleration, 'a', is be given by the following kinematic equations;

v² = u² + 2·a·s

v = u + a·t

Where;

v = The final velocity of the particle

u = The initial velocity of the particle

a = The acceleration of the particle

s = The distance through which the particle travels

t = The time of motion of the particle

By simplifying the above equation, we have;

v² - u² = 2·a·s

(v² - u²)/(2·a) = s

(v - u) × (v + u)/(2 × a) = s

((v - u)/a) × ((v + u)/2) = s

From v = u + a·t, we have;

t = (v - u)/a

∴ ((v - u)/a) × ((v + u)/2) = t × ((v + u)/2) = s

∴ ((v + u)/2) = s/t

The average velocity = (Total distance traveled by the particle) ÷ (The time of travel of the particle)

∴ The average velocity = s/t = ((v + u)/2) = Half the sum of the initial and final velocity

However, it is not still true that the average velocity of the particle is equal to half the sum of the initial and final velocities when the acceleration of the particle, 'a', is not constant, as the velocity time graph is no longer a straight line graph and the distance traveled by the particle, 's', which is the area under the velocity time graph, 'A', (given by the sum of area of the triangle and the rectangle given by the area under straight line graph for constant velocity) cannot be given directly by the product of the time and the average velocity.

Answer:

a have a bright tail and a glowing nucleus

A dwarf planet is most likely to have a bright tail and a glowing nucleus. Thus, the correct option is A.

A dwarf planet is a small planetary-mass object which is in direct orbit that of the Sun, it is smaller than any of the eight classical planets however it is still a world in its own right.

The prototypical dwarf planet is Pluto. The dwarf planets is that the geologically active bodies, which is an expectation that was borne out in 2015 by the Dawn mission to Ceres and the New Horizons mission to Pluto.

Dwarf planets always being in orbit around the Sun. They are not being a satellite of a planet. They having a mostly round shape due to its own gravity. They also have not cleared its neighboring region of debris.

Therefore, the correct option is A.

Learn more about Dwarf planet here:

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Answer:

a) 2000 m

b) 1500 mm

c) 580000 cm

d) 400 mm

e) 2.7 cm

f ) 0.126 m

g) 0.012 km

Explanation:

Transform

a) 2km to m

   1 km = 1000m

hence : 2 km = 2 * 1000 =  2000 m

b) 1.5m to  mm

    1 m = 1000 mm

hence: 1.5 m = 1.5 * 1000 = 1500 mm

C) 5.8 km  to cm

     1 km = 100000 cm

hence ;5.8 km = 5.8 * 100000 = 580000 cm

D) 0.4 m   to  mm

   1 m = 1000 mm

hence; 0.4 m =  0.4 * 1000 = 400 mm

E) 27 mm to  cm

   1 mm = 0.1 cm

hence ; 27 mm = 27 * 0.1  = 2.7 cm

F) 126mm  to m

    1 mm = 0.001 m

hence ;  126 mm = 126 * 0.001 = 0.126 m

G) 12m  to Km

   1 m = 0.001 km

hence ; 12 m = 12 * 0.001 = 0.012 km