Describe an object that has decreasing kinetic energy

Calculate the acceleration of a car (in m/s^2) that accelerates from 0 to 30 m/s in 6 s along a straight road.

tester [92]

Answer: 5 m/s^2

Explanation: In order to solve this question we have to use the kinematic equation given by:

Vf= Vo+a*t where V0 is zero.

we know that it takes Vf( 30 m/s) in 6 seconds

so

a=(30 m/s)/6 s= 5 m/s^2

8 0

3 years ago

Compare the de Broglie wavelength of an electron moving at 1.30×107 miles per hour (5.81×106 m/s) to that of a bullet moving at

lesya [120]

Answer:

electron λ = 12.5 nm , bullet λ = 1.11 10⁻³³ m and golf ball λ = 4.7 10⁻³⁴ m

Explanation:

The Broglie wave duality principle states that all matter has wave and particle properties, it is expressed by the equation

p = h / λ

Where lam is called broglie wavelength

Let's use the definition of momentum

p = mv

Let's calculate the wavelengths

-Electron

mv = h /λ

λ = h / mv

λ = 6.63 10⁻³⁴ / (9.1 10⁻³¹ 5.81 10⁶)

λ = 1.25 10⁻¹⁰ m

λ = 12.5 nm

This is the X-ray region

-bullet

λ = 6.63 10⁻³⁴ / (1.90 10⁻³ 313)

λ = 1.11 10⁻³³ m

It is too small, only particle characteristics are observed

-Golf ball

λ = 6.63 10⁻³⁴ / (4.50 10⁻² 31.3)

λ = 4.7 10⁻³⁴ m

Too small, only particle characteristics are visible

7 0

3 years ago

does the pair of equilibria produced by a saddle-node bifurcation have to consist of one that is stable and one that is unstable

Amiraneli [1.4K]

This bifurcation is called a saddle-node bifurcation. In it, a pair of hyperbolic equilibria, one stable and one unstable, coalesce at the bifurcation point, annihilate each other and disappear.

<h3>What is a bifurcation equilibria?</h3>

The mathematical study of changes in a family of curves' qualitative or topological structure, such as the integral curves of a family of vector fields or the solutions to a family of differential equations, is known as bifurcation theory.
A bifurcation happens when a tiny, gradual change in a system's parameter values (the bifurcation parameters) results in an abrupt, "qualitative," or topological change in the system's behavior.
This term is most frequently used to refer to the mathematical study of dynamical systems.
Both continuous systems (represented by ordinary, delay, or partial differential equations) and discrete systems can experience bifurcations (described by maps).

To learn more about bifurcation equilibria, refer to

brainly.com/question/14728055

#SPJ4

3 0

1 year ago

Un copil care merge pe jos pe calea ferata vede trecand, in decursul unui anumit interval de timp, prin dreptul sau un tren. Ace

krok68 [10]

sorry I dont speak Spanish

3 0

3 years ago

Choose the sequence of energy forms that best fits each item.

levacccp [35]

Answer:

1. chemical energy --> electrical energy --> light energy

2. Electrical Energy --> Mechanical Energy

3. Electrical Energy --> Heat Energy

4. Chemical Energy --> Thermal Energy --> Mechanical Energy

5. Nuclear Energy --> Light energy and thermal energy

6. Mechanical Energy --> Electric Energy

7. Chemical Energy --> Electrical Energy --> Sound Energy

8. Mechanical Energy --> Sound Energy

Explanation:

1.FLASHLIGHT:

chemical energy --> electrical energy --> light energy

The chemical energy from the cell batteries is converted to electrical energy, which is used to produce the light energy in form of flashlight.

2.ELECTRIC SAW:

Electrical Energy --> Mechanical Energy

The electrical energy from the socket is converted to the mechanical energy used to run the saw blade.

3.TOASTER:

Electrical Energy --> Heat Energy

The electrical energy from the socket is converted to the heat energy (thermal energy) used in browning the bread.

4.GAS POWERED SCOOTER:

Chemical Energy --> Thermal Energy --> Mechanical Energy

The chemical energy from fuel, such as petrol is converted to heat (thermal energy) in the engine by the process of combustion. This heat is then used to do work by conversion into mechanical energy, through piston movement, which in turn moves the shaft and the scooter.

5.THE SUN:

Nuclear Energy --> Light energy and thermal energy

The nuclear reactions on Sun provide nuclear energy which is converted into light and thermal energy that reaches us on earth.

6.WIND TURBINE:

Mechanical Energy --> Electric Energy

The mechanical energy is provided by wind when it rotates the blade of turbine. This is then converted to electrical energy b the turbine.

7.IPOD:

Chemical Energy --> Electrical Energy --> Sound Energy

The chemical energy i supplied by the battery of ipod, which is converted to electrical energy and that electrical energy is used to produce sound by ipod.

8.SPEAKER VIBRATES

Mechanical Energy --> Sound Energy

The mechanical energy due to vibration produces sound energy.

6 0

3 years ago

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