As stars age and become larger they become ________ and _______

Goal posts at the ends of football fields are padded as a safety measure for players who might run into them. How does thick pad

dimaraw [331]

When looking at it from a physics standpoint, the thick padding decreases the amount of force that a player experiences. Force equals mass times acceleration where acceleration is distance over time. The thick padding increases the amount of time the player makes contact with the post which decreases force.

8 0

3 years ago

Read 2 more answers

The total mass of the train and its passengers is 750000kg. The train is traveling at a speed of 84m/s. The driver applies the b

fiasKO [112]

Answer:

|F| = 393750 N

Explanation:

Given that,

Total mass of the train, m = 750000 kg

Initial speed, u = 84 m/s

Final speed, v = 42 m/s

Time, t = 80 s

We need to find the net force acting on the train. The formula for force is given by :

F = ma

$F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{750000\times (42-84)}{80}\\\\F=-393750\ N$

So, the magnitude of net force is 393750 N.

4 0

3 years ago

Which statement accurately describes the ultraviolet catastrophe

castortr0y [4]

Answer: A hot lightbulb gave off white visible light instead of ultraviolet light.

Explanation:

3 0

4 years ago

a 5.0 kg tool box is raised from the ground by a rope. if the upward acceleration of the bucket is 2.5 m/s^2 , find the force ex

denpristay [2]

Answer:

62 N

Explanation:

Sum of the forces on the toolbox:

∑F = ma

T − mg = ma

T = mg + ma

T = m (g + a)

T = (5.0 kg) (9.8 m/s² + 2.5 m/s²)

T = 61.5 N

Rounded to two significant figures, the force exerted by the rope is 62 N.

3 0

4 years ago

Please answer number 24 and 25 thank you

Tomtit [17]

24) B. Energy enters and exits the system matter does not

25) B. Energy is neither created nor destroyed; it is transformed and transferred.

Explanation:

24)

There are three types of systems in thermodynamics:

- Open system: an open system is a system in which both matter and energy are exchanged with the surroundings. An example of open system is an open bottle with some liquid inside.

- Closed system: a closed system is a system in which matter is exchanged with the surroundings, but energy cannot enter and exit the system. An example of closed system is a closed bottle: in fact, the air and the liquid cannot enter or exit the bottle, but heat can be exchanged through the walls of the bottle.

- Isolated system: an isolated system is a system in which neither matter nor energy can be exchanged with the surroundings. An example of isolated system is a sealed thermal container: in fact, air/liquid cannot leave the bottle, and heat cannot pass through the walls.

Therefore, the statement that best describes the island food web as a closed system is

B. Energy enters and exits the system matter does not

25)

The law of conservation of energy states that for an isolated system, the total energy of the system is constant: therefore, energy cannot be created or destroyed, but only transformed or transferred into different forms.

The Universe is an example of isolated system: as we assume that there is nothing outside the universe, the total energy of the universe must be constant.

An example of application of the law of conservation of energy is for an object in free fall: as the ball falls, if there are no frictional forces/air resistance acting on the ball, the total energy of the ball (given by the sum of its potential energy and its kinetic energy) is constant, and therefore as the ball falls down, there is a conversion of energy from potential energy to kinetic energy.

Therefore, the correct choice is

B. Energy is neither created nor destroyed; it is transformed and transferred.

Learn more about thermodynamics:

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#LearnwithBrainly

8 0

3 years ago

As stars age and become larger they become ________ and ________

As stars age and become larger they become and