A 750 kg car zooms away from a red light with an acceleration of 7.8 m/s2. What is the
average net force in Newtons that the car experiences?

Answer:

0.67m/s²

Explanation:

Given parameters:

Mass of toy  = 1.2kg

Force applied = 0.8N

Unknown:

Acceleration   = ?

Solution:

According to newton's second law of motion;

      Force  = mass x acceleration

Now,

      Acceleration = [tex]\frac{Force}{mass}[/tex]

     Acceleration  = [tex]\frac{0.8}{1.2}[/tex]   = 0.67m/s²

Answer:

force = 0.8 N

mass = 1.2 kg

force

[tex] \boxed{force = m.a}[/tex]

According to Newton's second law of motion

[tex] \boxed{ \bold \pink {\underline{f =m.a}}} [/tex]

where

f= force

m= mass

a= acceleration

substitute the value in the above formula

0.8 = 1.2 × accleration

accleration= 0.8/1.2

acceleration= 0.66 m/sec²

Answer:

23

Explanation:

Answer:

[tex]g'=10.78\ m/s^2[/tex]

Explanation:

The time period of a simple pendulum is given by :

[tex]T=2\pi \sqrt{\dfrac{L}{g}}[/tex]

L is length of the pendulum and g is acceleration due to gravity

At the bottom of Death valley, g = 9.8 m/s²

We need to find the value of g if the period of the pendulum is decreased by 5.00%.

T'=(T-0.05T)= 0.95 T

[tex]T\propto \dfrac{1}{\sqrt{g} }\\\\\dfrac{T}{T'}=\sqrt{\dfrac{g'}{g}}\\\\\dfrac{T}{0.95T}=\sqrt{\dfrac{g'}{9.8}}\\\\\dfrac{1}{0.95}=\sqrt{\dfrac{g'}{9.8}}\\\\1.1=\dfrac{g'}{9.8}\\\\g'=10.78\ m/s^2[/tex]

So, the new value of acceleration due to gravity is [tex]10.78\ m/s^2[/tex].

Answer:

gravity interactions

Answer:

a and b

water has a higher surface tension than veg oil

isopropyl alcohol boils more esier than water

Explanation:

just did the test trust me :)

A and B statement is true about the substances in this experiment.

A. Water has a higher surface tension than vegetable oil.

B. Isopropyl alcohol boils more easily than water.

A substance is a specific type of stuff with specific features. A substance is any pure compound or element. Water is a pure material and a hydrogen-oxygen combination.

A. Water has a higher surface tension than vegetable oil.

Reason:

The force operating at a border between two phases is measured as surface tension. Surface tension at liquid-air interfaces is caused by the higher attraction of liquid molecules to each other than air molecules.

Due to the relatively strong attraction of water. Hence molecules of water have high surface tension.

B.. Isopropyl alcohol boils more easily than water.

Reason:

isopropyl alcohol is a highly flammable liquid that evaporates significantly faster than water, especially when heated. The boiling point of isopropyl alcohol is lower than that of water.

Alcohol is more volatile than water. Hence Isopropyl alcohol boils more easily than water.

To learn more about the substance refer to the link;

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Answer:

  39.2 m/s

Explanation:

Given:

  free-fall from rest for 4 seconds

Unknown:

  final velocity (v)

Solution:

  equation: v = at

The acceleration due to gravity is 9.8 m/s², so the velocity after 4 seconds will be ...

  v = (9.8 m/s²)(4 s) = 39.2 m/s

At the bottom of the cliff, the velocity of the ball will be 39.2 m/s.

Answer:

ω = 0.1 rad/s

v = 0.002 m/s

Explanation:

The angular velcoity of the second hand of the clock can be found by:

ω = θ/t

where,

ω = Angular Speed

θ = Angular Displacement

t = time taken

Now, for one complete revolution of second hand of the clock:

θ = 2π rad

t = 60 s

Therefore,

ω = 2π rad/60 s

ω = 0.1 rad/s

Now, for the linear speed (V):

V = rω

where,

V = Linear Speed of Second Hand = ?

r = radius = length of second hand = 0.02 m

Therefore,

V = (0.02 m)(0.1 rad/s)

V = 0.002 m/s

Answer:

Bananas go through a process called ‘negative geotropism’ so they can reach the sun

Answer:

2400 meters

Explanation:

80*30=2400

Answer:

speed=80m/s

time=30s

distance=?

Now,

speed=d/t

80=d/30

d=80×30

d=2400m

Answer:

power=300watt

Explanation:

Answer:

ITS B need more characters so yessir

Both magnitude and direction. Centripetal acceleration always act towards the center of the circle and have constant value.

"When a body moves in a circular path the acceleration acting towards the center of the circle is called centripetal acceleration." Hence the magnitude and direction will not change.

Know more about centripetal acceleration here

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#SPJ2

Answer:

* viajan a través del aire, liquido o solido

*Moverse en la misma dirección que el flujo de energía

Explanation:

En el análisis de ondas existen dos tipo fundamentales: Transversales y longitudinales.

La ondas transversales las oscilación de la partícula es perpendicular al movimiento de la misma.

En la onda longitudinal el movimiento de la partícula es en la misma dirección que el movimiento de la onda, por esta razón están ondas se llaman ondas de compresión.

En base a las definiciones iniciales las frases correctas son:

* viajan a través del aire, liquido o solido

*Moverse en la misma dirección que el flujo de energía

Answer:

Cause molecules to vibrate

Travel through air, liquid, or solid

Move in the same direction as energy flow

Explanation:

Answer:It depends on the initial velocity of the projectile and the angle of projection. The maximum height of the projectile is when the projectile reaches zero vertical velocity. ... The horizontal displacement of the projectile is called the range of the projectile and depends on the initial velocity of the object

Answer:

The car has the greatest momentum, 160000 [kg*m/s]

Explanation:

In order to solve this problem we must remember that linear momentum is defined as the product of mass by Velocity. In this way we have the following equation

P = m*v

where:

P = lineal momemtum [kg*m/s]

m = mass [kg]

v = velocity [m/s]

Therefore we must calculate the momentum for both the truck and the car.

For the car

Pc = 2000*80

Pc = 160000 [kg*m/s]

For the Truck

Pt = 7000*20

Pt = 140000 [m/s]

The car has the greatest momentum

Answer:

6.8×10^6 m

Explanation:

f = velocity of light/ wavelength

440= 3×10^8 / wavelength

so

wavelength = 3×10^7/ 44

= 6.8×10^6 m

Answer:

Hype

Explanation:

Yyrru

gravitaional pull

not sure

Answer:

Explanation:

im sorry i coudnty help

Answer:

No, we should not pay attention to these opinions. (Find the essay below)

Explanation:

Celebrities are people who are prominent or well known because of the work that they do. Actors and sports stars are rightly classified as celebrities because their work affords them a lot of exposure. We see them on television, the internet and social media, and hear about their deeds and accomplishments on the radio.

This group of people always have their opinions about life and other topics of interest which they air when interviewed or when they decide to volunteer the information on their own accord. Most times fans who love them value their opinion so much that they even adjust to them or view it as the standard. For these fans, celebrities are their role models. They tend to copy their hairstyles, modes of dressing, and their opinions! Advertisers key to this fact when they use them to promote their goods.

It is very wrong to hold the opinions and actions of celebrities as the gold standard because they are imperfect and are prone to mistakes. Celebrities are just like any other one of us who have opinions or behave in ways that are sometimes wrong. Copying their every move, action, and opinions would be potentially damaging to us. Their opinions should be taken with a pinch of salt.

It is important that while fans maintain the love they have for their favorite celebrities, they also endeavor to have a mind of their own. Each person should know what works for him or her and live by such. It would be a great mistake to be easily carried away by the opinions of others.

Conclusively, balance is key. Love for celebrities should never cloud an individual's thinking. When this is done, future heartaches that come from adhering to wrong opinions can be avoided.

We should not pay attention to the opinions and actions that are portrayed by the media about celebrities.

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Friction and the applied force are not balanced. The 7 N push is countered by the frictional force of 3 N to push the box with a net force of 4 N.

Answer:

the total kinetic and potential energy of its particles

Explanation:

The energy contained in the small motions of the object's molecules can be broken up into a combination of microscopic kinetic energy and potential energy.

Answer:

a = 6.87 [m/s²]

Explanation:

To solve this problem we must use the following equation of kinematics.

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

where:

Vf = final velocity = 37 [m/s]

Vo = initial velocity = 15 [m/s]

a = acceleration [m/s²]

t = time = 3.2 [s]

Note: The positive sign in the above equation means that the velocity is increasing, due to the acceleration.

37 = 15 + a*3.2

3.2*a = 37 - 15

a = 6.87 [m/s²]

Answer:

bouyant force - the upward force on an object in a fluid

boiling point - the temperature at which a liquid becomes a gas

solubility - the ability of a substance to dissolve in another

conductivity- the ability to transfer heat or electricity

density - the amount of mass in a given volume

Answer:

b

Explanation:

Answer:

B. Vastus Lateralis

Explanation:

The vastus lateralis muscle is located on the side of the thigh. This muscle is the largest of the quadriceps group.

Answer:

true

Explanation:

Answer:

If both the radius and frequency are doubled, then the tension is increased 8 times.

Explanation:

The radial acceleration ([tex]a_{r}[/tex]), measured in meters per square second, experimented by the moving end of the string is determined by the following kinematic formula:

[tex]a_{r} = 4\pi^{2}\cdot f^{2}\cdot R[/tex] (1)

Where:

[tex]f[/tex] - Frequency, measured in hertz.

[tex]R[/tex] - Radius of rotation, measured in meters.

From Second Newton's Law, the centripetal acceleration is due to the existence of tension ([tex]T[/tex]), measured in newtons, through the string, then we derive the following model:

[tex]\Sigma F = T = m\cdot a_{r}[/tex] (2)

Where [tex]m[/tex] is the mass of the object, measured in kilograms.

By applying (1) in (2), we have the following formula:

[tex]T = 4\pi^{2}\cdot m\cdot f^{2}\cdot R[/tex] (3)

From where we conclude that tension is directly proportional to the radius and the square of frequency. Then, if radius and frequency are doubled, then the ratio between tensions is:

[tex]\frac{T_{2}}{T_{1}} = \left(\frac{f_{2}}{f_{1}} \right)^{2}\cdot \left(\frac{R_{2}}{R_{1}} \right)[/tex] (4)

[tex]\frac{T_{2}}{T_{1}} = 4\cdot 2[/tex]

[tex]\frac{T_{2}}{T_{1}} = 8[/tex]

If both the radius and frequency are doubled, then the tension is increased 8 times.

If both the radius and frequency are doubled, then the tension will be increased 8 times.

From kinematic formula:

[tex]\bold {a_r = 4\pi r^2 \times f^2 \times R^2}[/tex] .............................. (1)

Where:  

f - Frequency,    

R - Radius of rotation,  

From Second Newton's Law,

[tex]\bold {\sum F = T = m\times a_r }[/tex] ......................... (2)

Where

m is the mass of the object,

From equation 1 and 2,

[tex]\bold {T = m\times 4\pi r^2 \times f^2 \times R^2}\\[/tex] .................... (3)

From equation, tension is directly proportional to the radius and the square of frequency.

Then, if radius and frequency are doubled, then the ratio between tensions is:

[tex]\bold {\dfrac {T_2}{T_1} = (\dfrac {F_2}{F_1})^2 \times \dfrac {R_2}{R_1} = 4 \times 2 = 8 }[/tex]  

Therefore, If both the radius and frequency are doubled, then the tension will be increased 8 times.

To know more about frequency,

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 75 × 3

We have the final answer as

Hope this helps you

The rocket attains a speed of 60 m/s in a matter of 6.3 s, so it is undergoing an acceleration a of

a = (60 m/s - 0) / (6.3 s) ≈ 9.52 m/s²

During launch, the only forces acting on the rocket are directed vertically:

• its weight (pointing down) with magnitude W,

• drag (pointing down) with magnitude 50 N, and

• thrust (pointing up) with magnitude T.

(a) By Newton's second law, the magnitude of the net force is proportional to the acceleration according to

∑ F = m a

where m is the mass of the rocket, so the magnitude of the net force is

(8 kg) (9.52 m/s²) ≈ 76.2 N

and it is directed upward.

(b) Expanding the equation from part (a) gives

T - W - 50 N = (8 kg) (9.52 m/s²)

The weight is

W = (8 kg) g = (8 kg) (9.80 m/s²) = 78.4 N

so the thrust force is

T ≈ 76.2 N + 78.4 N + 50 N ≈ 205 N

(c) We found this earlier, a ≈ 9.52 m/s².

(d) The rocket's height y at time t is given by

y = 1/2 a t ²

so that after 6.3 s, it will have reached a height of

y = 1/2 (9.52 m/s²) (6.3 s)² = 189 m