energy is the energy of the motion or vibration of molecules in a substance.a. Heat
b. Nuclear
c. Chemical
d. Electromagnetic
A wrecking ball on its way down before it hits a building is an example of energy being converted into energy.
a. kinetic, potential
b. potential, kinetic
c. potential, potential
d. kinetic, mechanical
A wrecking ball on its way down before it hits a building is an example of energy being converted into ...

Answers

Answer 1

Answer: Heat energy is the energy of the motion or vibration of molecules in a substance. The answer is letter A. A wrecking ball on its way down before it hits a building is an example of kinetic energy being converted into mechanical energy. The answer is letter D.

Answer 2

Answer:

The answer to the first question is A. Heat, because in order to heat up or catch fire, the molecules have to vibrate quickly.

This wrecking ball is an example of potential energy being converted into kinetic energy, so your answer is B. potential, kinetic.

Source: I have had to answer both questions before.

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If the tension in a rope is increased what will happen to the speed of a wave traveling through the rope
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A spacecraft is fueled using hydrazine (N2H4; molecular weight of 32 grams per mole [g/mol]) and carries 1640 kilograms [kg] of fuel. On a mission to orbit a planet, the fuel will first be warmed from −186 degrees Fahrenheit [°F] to 78 degrees Fahrenheit [°F] before being used after the long space flight to reach the planet. The specific heat capacity of hydrazine is 0.099 kilojoules per mole kelvin [kJ/(mol K)]. If there is 300 watts [W] of power available to heat the fuel, how long will the heating process take in units of hours [h]?

The weight of an object on a planet depends not only on its mass, but also on its distance from the planets center. Uranus has more than 14 times as much mass as earth, yet the gravitational force is less. Explain how this could be. Pleas answer cause idk what it means.

Answers

The further an object is from the centre of a planet, the lower it's gravitational force. Uranus had 14 times as much mass as earth, but it's also a lot bigger than earth. So assuming an object is on the surface of Uranus, it would be really far away from the centre of Uranus, therefore the gravitational force is less.

Hope this helps!

weight w=m*g
where m is the mass and g the gravitational acceleration.
Uranus has much more mass than Earth though it has less gravitational force than Earth.

Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 33.0 g, a specific heat capacity of c = 804 J/(kg C°), and a temperature of 15.4 °C. It is immersed in 149 g of water, and the final temperature of the water and thermometer is 56.0 °C. What was the temperature of the water in degrees Celsius before the insertion of the thermometer?

Answers

Answer : The temperature of water is, $57.7^oC$

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1* c_1* (T_f-T_1)=-m_2* c_2* (T_f-T_2)$

where,

$c_1$ = specific heat of thermometer = $804J/kg.^oC=0.804J/g^oC$

$c_2$ = specific heat of water = $4.18J/g.^oC$

$m_1$ = mass of thermometer = 33.0 g

$m_2$ = mass of water = 149 g

$T_f$ = final temperature = $56.0^oC$

$T_1$ = initial temperature of thermometer = $15.4^oC$

$T_2$ = initial temperature of water = ?

Now put all the given values in the above formula, we get:

$33.0g* 0.804J/g^oC* (56.0-15.4)^oC=-149g* 4.18J/g.^oC* (56.0-T_2)^oC$

$T_2=57.7^oC$

Therefore, the temperature of water is, $57.7^oC$

What best describe a sound wave

Answers

A sound wave can also be described as a longitudinal wave. In a longitudinal wave, a source vibrates back and forth, causing air molecules to move back and forth in the same (in other words, parallel) direction that the wave is transmitted.

Final answer:

Sound can be best described as a mechanical wave and a disturbance in matter that is transmitted from its source outward. This disturbance can move in the form of periodic waves or longitudinal waves. The speed, frequency, and wavelength of a sound are interconnected and sound requires a medium to propagate.

Explanation:

Sound is best described as a mechanical wave, a type of disturbance in matter that is transmitted from its source outward. This movement can be in the form of periodic or longitudinal waves, implying that they move matter back and forth in the direction of the wave's motion. The speed of sound, its frequency, and its wavelength are interconnected, and this is described mathematically by the relationship v = fλ. This relationship shows that the velocity of sound (v) equates to the frequency (f) multiplied by the wavelength (λ).

Sound waves can be both audible and inaudible, originating from various sources, ranging from musical instruments to vocal voices to explosive bangs like a sonic boom. Also, to note is that sound is interpreted through our sense of hearing, and different frequencies and intensities create different sounds. Sound also has the ability to travel through different mediums, including solids, liquids, and gases, with varying speeds.

On a microscopic level, sound can be seen as synchronized oscillation of atoms. This type of motion is more organized than the thermal motion of the atoms. The behavior of sound waves is significantly different from light waves, as sound requires a medium to propagate, while light can travel in a vacuum.

Learn more about Sound Waves here:

brainly.com/question/11797560

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Why was the concern over global cooling replaced with a concern over global warming?

Answers

During 1970s, same observations were seen as what we have observed today pertaining to our climate. Journals were discussing that there would be warming because of greenhouse gases emissions. Also, it was observed between the years 1970 to 1990 that there was a steady surface temperature increase. Due to this, people are now fixated with global warming rather than on global cooling.

Most earthquakes are produced by the rapid release of which kind of energy stored in rock subjected to great forces?a. kinetic
b. thermal
c. elastic
d. mechanica

Answers

The correct answer for the question that is being presented above is this one: "c. elastic." Most earthquakes are produced by the rapid release of
elastic energy stored in rocks subjected to great forces. The greater the elasticity of the energy, the more it is subjected to great forces.

In a Broadway performance, an 77.0-kg actor swings from a R = 3.65-m-long cable that is horizontal when he starts. At the bottom of his arc, he picks up his 55.0-kg costar in an inelastic collision. What maximum height do they reach after their upward swing?

Answers

Answer: h =1.22 m

Explanation:

from the question we were given the following

mass of performer ( M1 ) = 77 kg

length of cable ( R ) = 3.65 m

mass of costar ( M2 ) = 55 kg

maximum height (h) = ?

acceleration due to gravity (g) = 9.8 m/s^2 (constant value)

We first have to find the velocity of the performer. From the work energy theorem work done = change in kinetic energy

work done = 1/2 x mass x ( (final velocity)^2 - (initial velocity)^2 )

initial velocity is zero in this case because the performer was at rest before swinging, therefore

work done = 1/2 x 77 x ( v^2 - 0)

work done = 38.5 x ( v^2 ) ......equation 1

work done is also equal to m x g x distance ( the distance in this case is the length of the rope), hence equating the two equations we have

m x g x R = 38.5 x ( v^2 )

77 x 9.8 x 3.65 = 38.5 x ( v^2 )

2754.29 = 38.5 x ( v^2 )

( v^2 ) = 71.54

v = 8.4 m/s ( velocity of the performer)

After swinging, the performer picks up his costar and they move together, therefore we can apply the conservation of momentum formula which is

initial momentum of performer (P1) + initial momentum of costar (P2) = final momentum of costar and performer after pick up (Pf)

momentum = mass x velocity thereforethe equation above now becomes

(77 x 8.4) + (55 x 0) = (77 +55) x Vf

take note the the initial velocity of the costar is 0 before pick up because he is at rest

651.3 = 132 x Vf

Vf = 4.9 m/s

the performer and his costar is 4.9 m/s after pickup

to finally get their height we can use the energy conservation equation for from after pickup to their maximum height. Take note that their velocity at maximum height is 0

initial Kinetic energy + Initial potential energy = Final potential energy + Final Kinetic energy

where

kinetic energy = 1/2 x m x v^2

potential energy = m x g x h

after pickup they both will have kinetic energy and no potential energy, while at maximum height they will have potential energy and no kinetic energy. Therefore the equation now becomes

initial kinetic energy = final potential energy

(1/2 x (55 + 77) x 4.9^2) + 0 = ( (55 + 77) x 9.8 x h) + 0

1584.7 = 1293 x h

h =1.22 m

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