In nature, is mechanical energy always conserved (yes or no) why?

Expert Solution

genius_generous answered 5 months ago

In nature, is total energy always conserved (yes or no)? Why?

Suppose the total mechanical energy of an object is conserved. Which one or more of the...

Suppose the total mechanical energy of an object is conserved. Which one or more of the following statements is/are true? A) If the kinetic energy decreases, the gravitational potential energy increases B) If the gravitational potential energy decreases, the kinetic energy increases C) If the kinetic energy does not change, the gravitational potential energy also does not change D) All of the above E) None of the above

In which situation is mechanical energy conserved? A. a parachutist descends at constant speed B. a...

In which situation is mechanical energy conserved? A. a parachutist descends at constant speed B. a car slows down without braking along a flat road C. a heavy crate is raised at constant speed via a rope and pulley system D. a sled accelerates as it slides down a frictionless inclined plane ____________________ Two spaceships have the same mass. Spaceship A has kinetic energy K and spaceship B has kinetic energy 16K. What is the ratio of their speeds, vA/vB?...

13a. For an object's mechanical energy to be conserved, what condition must be satisified? Group of...

13a. For an object's mechanical energy to be conserved, what condition must be satisified? Group of answer choices There is no fore acting on the object. There is no friction force acting on the object There is only conservative forces acting on the object. There is only conservative forces doing work on the object. b.The SI unit of the spring constant k is _________. (You may need to check your textbook for the answer.) Group of answer choices N N/m...

Select the situations from the list below in which mechanical energy is conserved. A ball sliding...

Select the situations from the list below in which mechanical energy is conserved. A ball sliding down a hill with friction. The Moon orbiting the Earth. A ball sliding down a frictionless hill. A child swinging on a frictionless swing, ignoring air resistance. A ball that is dropped from a certain height and bounces back to a lower height. An ice skater gliding along the ice. Someone else posted this but the answer isn't correct.

If energy is always conserved, how can some devices be more efficient then others?

rRNA sequences are among the most highly conserved in nature. What does the word conserved mean...

rRNA sequences are among the most highly conserved in nature. What does the word conserved mean in this context? . (1) Why are rRNA sequences so strongly conserved? . (2) The different stages of translation use several factors that are not a part of the ribosome. What are these factors, meaning what are they made of? . (1) (2) Why are they not considered to be a part of the ribosome? . (2) The hydrophobic effect helps explain why proteins...

What does it mean for a quantity to be conserved? Why are conserved physical quantities useful...

What does it mean for a quantity to be conserved? Why are conserved physical quantities useful to physicists? Give an example which illustrates the difference between three kinds of energy and the transformation of energy from one kind to another. Your example may include some of the following kinetic, thermal, gravitational potential, and spring potential energy. In your example explain the difference between Energy, Work, and Power.

1.What is the unit for kinetic energy? 2.A collision in which kinetic energy is conserved is...

1.What is the unit for kinetic energy? 2.A collision in which kinetic energy is conserved is called what? 3. It takes no work to hold a cheerleader in the air, as shown here. If no work is done by the cheerleaders, why do they eventually tire? A.The concept of work, as it apples in physics, does not apply to any process that involves people. B.Their bodies expend chemical energy as their muscles function; this is "hard work," but not the...

1. Show that the Kinetic Energy and the Momentum are conserved in this system. (Remember that...

1. Show that the Kinetic Energy and the Momentum are conserved in this system. (Remember that momentum is a vector, so you need to show the conservation of the momentum in x and y directions separately.) Data: Before the collision: m1= 1kg v1x =1 m/s v1y=0 m/s m2=1kg v2x=-1m/s v2y=0 m/s After the collision: m1= 1kg v1x =-0.778 m/s v1y=-0.629 m/s m2=1kg v2x= 0.778 m/s v2y=0.629 m/s 2. From the data, calculate the direction(angles) of the final velocities of the...

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