State the law of conservation of energy

Answers

Answer 1

Answer:

Answer:

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.

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If the unemployment rate is rising, what part of the business cycle is the economy most likely experiencing? A. Peak B. Expansion C. Spiral D. Recession

What is the kinetic energy of a 1.0-kg billiard ball that moves at 5.0 m/s? A. 5.0 J B. 6.5 J C. 10.0 J D. 12.5 J

Answers

The kinetic energy of a moving body can be determined from its mass and velocity of the body. The kinetic energy of 1.0-kg billiard ball that moves at 5.0 m/s is 12.5 J. Hence, option D is correct.

What is kinetic energy?

Kinetic energy is a form of energy generated in body by virtue of its motion. It is directly proportional to the mass and square of velocity of the body. The equation of kinetic energy is written as follows:

KE = 1/2 mv²

When a body starts moving its kinetic starts to increase while the potential energy drops out. However the total mechanical energy in the system will be conserved.

The mass of the billiard ball is given 1 kg and the velocity is 5 m/s. Then the kinetic energy of the ball is calculated as follows:

KE = 1/2 1 kg × ( 5 m/s )².

= 1/2 × 25

= 12.5 J.

Therefore, the kinetic energy of 1.0-kg billiard ball that moves at 5.0 m/s is 12.5 J. Hence, option D is correct.

To find more about kinetic energy, refer the link below:

brainly.com/question/12669551

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The formula for a kinetic energy (KE) is
KE = 0.5*m*v²

Given m = 1.0 kg, v = 5.0 m/s, so
KE = 0.5*1.0*(5.0)² = 12.5 J

The answer is D.

A 1451 kg car is traveling at 48.0 km/h. How much kinetic energy does it possess? K.E. =

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   Kinetic energy = (1/2) (mass) (speed)²

BUT . . . in order to use this equation just the way it's written,
the speed has to be in meters per second. So we'll have to
make that conversion.

KE = (1/2) · (1,451 kg) · (48 km/hr)² · (1000 m/km)² · (1 hr/3,600 sec)²

   = (725.5) · (48 · 1000 · 1 / 3,600)² (kg) · (km·m·hr / hr·km·sec)²

   = (725.5) · ( 40/3 )² · ( kg·m² / sec²)

   = 128,978 joules (rounded)

A bullet leaves a gun with a horizontal velocity of 100 m/s. Calculate the distance it would travel in 1.3 seconds. a 1247 m
b 0.013 m
c 130 m
d 76.92 m

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Answer:

Option C is the correct answer

Explanation:

We have equation of motion , $s= ut+(1)/(2) at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

In this case initial velocity = horizontal velocity = 100 m/s, acceleration = 0 $m/s^2$ , we need to calculate displacement when time = 1.3 seconds.

Substituting

$s= 100*1.3+(1)/(2) *0*1.3^2 = 130 meter$

So, bullet will travel a distance of 130 meter in 1.3 seconds.

Option C is the correct answer

For a satellite to stay in orbit around Earth, it has to be moving forward very fast all the time. What force will make it fall to Earth if it goes too slowly?Earth's gravity

the force of friction

the magnetic force from Earth's north pole

the Sun's gravity

Answers

Maintaining an orbit has nothing to do with the satellite's speed.
ANY (tangential) speed is enough to stay in orbit, if the satellite
just stays away from Earth's atmosphere.

If the satellite completely stops moving 'sideways' at all, and just
hangs there, then the forces of gravity between the satellite and
the Earth will pull them together ... the satellite will fall into the
atmosphere and then to the ground.

Most important
Centripetal force which makes it attract towards the earth and makes it able to move around

If you had two forces, one with a magnitude of 25 N and the the other with a magnitude of 100 N, what would be the maximum net force these forces could exert on an object?

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The maximum occurs when both of those forces push on an object
in the same direction. Then, the net force on the object is 125 N.

One of the things he was bothered by was the long-held belief of Aristotle thatobjects, including the Earth, naturally come to rest unlessthey are forced to move byan external force(the motion of the other planets was considered special– they had theproperty ofquintessenceso that their natural state was to move in circles). One thingthat bothered Copernicus is that nobody could imagine a force large enough to keep theEarth moving around the Sun. Galileo and Newton understood that objects had inertia–that they tended to keep moving in a straight line at constantspeed (or sit still) unlessacted on by an external force– in the cases of objects ‘naturally’ coming to rest, frictionwas identified as the responsible force. So for the Earth, there doesn’t need to be anexternal force to keep it moving, just so long as it isn’t being affected by friction. As wewill learn in subsequent chapters, gravity is what keeps theEarth moving in an ellipsearound the Sun rather than just moving through space in a straight line.

The method of heat transfer by which the sun warms the earth isA) conduction
B) convection
C) radiation
D) solaration

Answers

let's break it down
a. conduction works when there's a medium where heat is being transferred. no medium in a vacuum. No

b. flow of gas or liquid. No

c.works on a vacuum.yes

d.doesn't exist.NO

the answer is C

Answer:

radiation

Explanation:

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