Please help me i need it it’s the only way i’ll pass

Answers

Answer 1

Answer:

Answer:

I think the Answer is B. Longitudinal waves

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According to Newton's 2nd law of motion, if you hit a baseball with a bat it will _____.

Answers

Answer:

The baseball will accelerate.

Explanation:

According to Newton's second law,

The force is the product of the mass and acceleration of the object.

In mathematically term

$F = ma$

Where, m = mass

a = acceleration

If we hit a baseball with a bat it will accelerate by the applied force.

Hence, The baseball will accelerate.

it will go a certain distance then stop or slow down by the winds force

Heat of Fusion How much thermal energy is needed change 50.0 g of ice at -20.0°C to water at 10.0°C?

Answers

We should divide the problem into 3 separate processes.

1) Bring the temperature of the ice from $-20.0^(\circ)C$ to its melting point ( $0^(\circ)C$ ): the amount of heat needed in this process is
$Q_1=mC_s \Delta T$
where
$m=50.0 g$ is the mass of the ice
$C_s = 2.108 J/g^(\circ)C$ is the specific heat capacity of ice
$\Delta T=0^(\circ)C-(-20^(\circ)C)=20^(\circ)C$ is the increase of temperature

Plugging numbers into the equation, we find
$Q_1 = (50.0 g)(2.108 J/g^(\circ)C)(20^(\circ)C)=2108 J$

2) Fusion of ice
When the ice is at melting point, we need to add a certain amount of heat in order to melt it, and this amount of it is given by:
$Q_2 = mL_f$
where
$m=50.0 g$ is the mass of ice
$L_f = 334 J/g$ is the latent heat of fusion of ice

Plugging numbers into the equation, we find
$Q_2 = mL_f = (50.0g)(334 J/g)=16700 J$
During this phase transition, the temperature of the ice/water does not change.

3) Bring the temperature of the water from $0^(\circ)C$ to $10^(\circ)C$

The amount of heat needed for this process is
$Q_3 = mC_s \Delta T$
where
$m=50.0 g$ is the mass of water
$C_s = 4.187 J/g^(\circ)C$ is the specific heat capacity of water
$\Delta T=10^(\circ)C-0^(\circ)C=10^(\circ)C$ is the increase of temperature

Plugging numbers into the equation, we find
$Q_3 = (50.0 g)(4.187 J/g^(\circ)C)(10.0^(\circ)C)=2094 J$

--> therefore, the total energy needed for the whole process is:
$Q=Q_1+Q_2+Q_3=2108 J+16700 J+2094 J=20902 J=20.9 kJ$

A cat is being chased by a dog. Both are running in a straight line at constant speeds. The cat has a head start of 3.8 m. The dog is running with a speed of 8.9 m/s and catches the cat after 6.0 s. How fast did the cat run?

Answers

In 6 secs, the dog covers-
S=vt
8.9*6 = 53.4 m.
In the same time, the cat covers, 53.4-3.8 = 49.6 m.
Thus, speed of the cat, v= s/t,
= 49.6/6 = 8.267 m/s

describe the various renewable resources of energy that have the potential to fulfill the needs of the society

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As a whole, renewable energies are big advantage for society because the source are just easy to access and you need not to pay. Here are the renewable resources:
(1) Solar Power - It is a way of obtaining usable energy from the light of the sun. Why not take advantage of the increasing heat of the sun as energy?
(2) Wind Power - It is a way of obtaining usable energy from the wind. There are places in the world that is very windy.
(3) Hydropower - It is a way of obtaining usable energy from water that falls or moving. Because of the force it exerts, most especially to waterfalls, it create a big push to produce energy.

Which types of electromagnetic wave travels through space the fastest?

Answers

Answer:

The electromagnetic wave that travels the fastest through space is gamma ray

Explanation:

Electromagnetic wave is a type of wave which does not require material medium for its propagation. Examples of electromagnetic waves according to increasing frequency of the waves are gamma ray, x-ray, ultra violet ray, infra red, visible light, micro wave and radio waves.

Frequency of a wave is inversely proportional to period of oscillation of the wave. The higher the frequency of a wave, the shorter the period of oscillation. Gamma ray has the highest wave frequency in electromagnetic spectrum and shorter period of oscillation, thereby causing it to have the highest penetration power.

Through which substance will sound travel fastest?
the ground
the ocean
the air

Answers

Sound waves travel fastest through the ground.

What is meant by a longitudinal wave ?

A longitudinal wave is a form of wave in which the medium vibrates parallel to the direction of the wave.

Here,

The displacement of the medium moves with the wave motion in the same direction.

Sound waves are longitudinal waves because, the direction of the energy transport is parallel to the oscillations of the sound waves.

Since, it is created by compressions and rarefactions in the air, sound waves are known as longitudinal waves. The air particles vibrate in a direction that is parallel to the direction of propagation.

The sound waves require a medium to propagate.

Solids and liquids have the quickest sound wave propagation rates, whereas gases have the slowest. Gases are very loosely packed while liquids are not as securely packed as solids. Sound moves through solids much more quickly than it does through gases due to the distance between the molecules.