You shove a chair with wheels(and let it go)and it starts moving across the floor. However,the chair soon shows down and comes to a complete stop. To keep the chair moving,you need to keep pushing on it.
This simple experiment implies that ;

A) Newton's first law,or the law of inertia,does not apply to a chair moving horizontally
B) The action-reaction forces act on the chair and cancel each other
C) A net force in the direction opposite to the motion of the chair acts to slow it down
D) The weight of the chair slows it down ​

Answer:18/2

Explanation:

its half

Answer:

40mph

Explanation:

20miles  .5 miles away if you go 20 mph you get there in a hour soo if you double to 40 mpg you get there in 0.5

Answer:

40 mph

Explanation:

you went 20 miles in half a hour, multiply twenty by 2 and you get 40

Answer:

,

Explanation:

Answer:

A. As the blackbody radiator becomes warmer, it emits light of shorter wavelengths.

The temperature, and electromagnetic radiation has a relationship where blackbody radiator becomes warmer, it emits light of shorter wavelengths.

radiation can be regarded as the process of heat dissipation without contact with a body.

Therefore , temperature, and electromagnetic radiation of a black body works in the sense that

blackbody radiator becomes warmer during emissions.

learn more about radiation at;

https://brainly.com/question/25110079

#SPJ2

Answer:

Science is

Explanation:

he intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.

chemical, sound, radiant, electric???

Answer:

This is true

Explanation:

This is true because in other To measure the potential difference that is across a circuit, we have to place the device called the voltmeter to be in parallel withe the circuit, so as to get a measurement of the difference in energy from one side of the circuit to the other side. We can also refer to the Potential difference as the voltage and it is measured in volts using a voltmeter

Answer:

Yes

Explanation:

It is possible because a stone on the ground is at rest with respect to earth but at the same time earth is moving around the sun. That means everything on earth is moving so with respect to sun the stone is also moving. That is how the stone is in rest also and is in motion also.

Answer:

The Kinetic energy and mass are _directly_ proportional.

Explanation:

We know that Kinetic Energy is basically termed as the capacity of a body to do work.

Kinetic energy is often used to associate with moving objects, therefore, K.E is normally termed as the energy of motion.

The formula of K.E of an object of mass and velocity is defined

K.E = 1/2mv²

From the formula, it is clear that K.E is directly proportional to its mass and also directly proportional to the square of its velocity.

For example,

If A toy plane with a mass of 10 kg is flying at 20 m/s. Its K.E will be:

K.E = 1/2mv²

      = 1/2(10)(20)²

      = 1/2(10)(400)

       = 5(400)

      = 2000 J

Now, let suppose, if we double the mass of a toy plane i.e.

m = 20 kg

so

K.E = 1/2mv²

      = 1/2(20)(20)²

      = 1/2(20)(400)

      = 10(400)

      = 400 J

Therefore, the K.E is doubled when doubled the mass.

Therefore, the Kinetic energy and mass are _directly_ proportional.

Answer:

directly

Explanation:

I think you have to do 3000n times 1200kg an that will get ur answer

Answer:

[tex]a=1.4m/s^2[/tex]

Explanation:

From the question we are told that

Velocity v=28m/s

Distance d=280

Generally the Newtons equation for motion is mathematically given as

Acceleration

[tex]v^2=2as[/tex]

[tex]a=\frac{V^2}{2s}[/tex]

[tex]a=\frac{28^2}{2*280}[/tex]

[tex]a=1.4m/s^2[/tex]

B

Explanation:

I not sure try to solve I am sorry

Answer:

Energy

Explanation:

One ways of stating the law of conservation of energy is that "you cannot get more energy from a machine than the amount of energy you put into it".

The law of conservation of energy states that in a system, energy is neither created nor destroyed but transformed from one form to another.

The energy in a system does not increase based on the premise of this law.

Answer:

just in internet tho

Signs look, listen, feel and smell for any signs of injury such as swelling, deformity, bleeding, discolouration or any unusual smells. When checking them you should always compare the injured side of the body with the uninjured side. Are they able to perform normal functions such as standing or moving their limbs

Secondary assessments are used in order to determine the injury, how the injury occurred, how severe the injury is, and to eliminate further injury.

Glad to help!

Answer:

2000N

Explanation:

Given parameters:

Mass of the car  = 1000kg

Acceleration  = 2m/s²  

Unknown:

The net force exerted on the car  = ?

Solution:

From newtons second law of motion;

     F =  mxa

F is the net force

m is the mass

a is the acceleration

       F = 1000 x 2 = 2000N

Answer:

ANswers

Explanation:

Friction, knetic, and physics

Answer:

1)

Acceleration (a)=change in velocity/ change in time

Velocity (v)=90m/s

Time=0.0005s

a=90/0.0005

The acceleration =180000m/s^2 or 180km/s^2

Force = mass x acceleration

m=40g= 0.04kg

F= 0.04x 180000

F= 7200N or 7.2kN

Explanation:

Answer:

1000J

Explanation:

Given parameters:

Mass  = 20kg

Speed  = 10m/s

Unknown:

Kinetic energy  = ?

Solution:

To solve this problem, we use the kinetic energy equation:

  Kinetic energy  = [tex]\frac{1}{2}[/tex] m v²  

m is the mass

v is the speed

 Now insert the parameters and solve;

     K.E  =  [tex]\frac{1}{2}[/tex]  x 20 x 10²   = 1000J

Answer:

distance =13km , displacement=3km

Explanation:

north south does not affect displacement

Answer:Learn what gravitational potential energy means and how to calculate it. ... a pulley and rope, so the force due to lifting the box and the force due to gravity, ... would be used by an elevator lifting a 75 kg person through a height of 50 m if the ... When you are close to a planet you are effectively bound to the planet by gravity ..

Explanation:

Answer: Stars are formed in clouds of gas and dust, known as nebulae. Nuclear reactions at the centre (or core) of stars provides enough energy to make them shine brightly for many years. The exact lifetime of a star depends very much on its size.

Explanation: I try to do your question, hope this help

Answer:

A bicycle on the top of the hill has the highest potential energy, and when the bike goes down, it transfers to kinetic because it is moving

Explanation:

yeah

Answer:

Wavelength

Explanation:

Answer:

wavelength

Explanation:

ape x

Formula for kinetic energy:

K = ½mv²

Given:

v = 1.4 m/s

m = 71 kg

K = ½ · 71.0 kg · (1.4 m/s)²

K = 35.5 kg · 1.96 m²/s²

K = 69.58 J