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3 years ago

As the pressure on a sample of gas increases, the volume of the sample _____. decreases stays the same increases

Physics

2 answers:

TEA [102]3 years ago

5 0

Answer : As the pressure on a sample of gas increases, the volume of the sample decreases.

Explanation :

According to the Boyle's, law, the pressure of the gas is inversely proportional to the volume of gas at constant temperature and moles of gas.

$P\propto \frac{1}{V}$ (At constant temperature and moles of gas)

From the we conclude that the higher the pressure of gas, lower will be the volume and lower the pressure of gas, higher will be the volume of gas.

Hence, as the pressure on a sample of gas increases, the volume of the sample decreases.

Allisa [31]3 years ago

3 0

By Boyle's law the volume of the sample decreases, provided temperature is constant.

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Water enters an ice machine at 55F and leaves as ice at 25F. If the COP of the ice machine is 3.7 during this operation, determi

boyakko [2]

Answer:

The required power is $P_i = 0.2692 \ hp$

Explanation:

From the question we are told that

The temperature of the water entering ice machine is $T_1 = 55 ^o F$

The temperature of the water leaving is $T_2 = 25 ^oF$

The COP of the ice machine is $COP= 3.7$

The production rate of an ice $\r m = 15.0 \ lbm /hr$

The energy that needs to removed from each lbm of water at 55 F is $E = 169 Btu$

Generally the cooling load of the ice machine is mathematically represented as

$\r Q_L = \r m * E$

$\r Q_L =15 * 169$

=> $\r Q_L = 2535 \ Btu/h$

Generally the COP of the ice machine is mathematically represented as

$COP = \frac{\r Q_L}{P_i}$

Here $P_i$ is the net power input needed to successfully run the ice machine

$3.7 = \frac{2535}{P_i}$

=> $P_i = 685 \ Btu/h$

Converting to horsepower

$P_i = \frac{685}{2545}$

=> $P_i = 0.2692 \ hp$

3 0

3 years ago

How far would a horse that rides at 8.1 m/s travel and 8.5 minutes

Xelga [282]

V = S/t

The time is in minutes, it needs to be converted to seconds, because the Velocity 8.1meters/second.

1 min -------- 60 secs
8.5 min -------- x secs
-> x = 8.5 . 60
-> x = 510secs

-> 8.1 = S/510
-> 510 x 8.1 = S
-> S = 4131 meters

3 0

4 years ago

The energy required to start a reaction is called the activation energy. true false

Gemiola [76]

The energy required to start a reaction IS called the activation energy. TRUE

3 0

3 years ago

A car having a total mass of 2250 kg and traveling at 72.0 km/h smashes into a tree. The car is stopped in 0.250 s. The average

musickatia [10]

Answer:

A. 1.8x10⁵

Explanation:

For this question we have

72km/h = speed

Total mass = 2250kg

Stopped at t = 0.2250s

To get average force acting on this car on collision:

72km/3.6 = 20m|s

Impulse = ∆p

This implies:

F∆t = m∆v

F = m∆v/∆t

= 2250x20/0.250

= 180000

= 1.8x10⁵

Therefore option A is correct.

4 0

3 years ago

1. Compare and contrast the two kinds of waves.

max2010maxim [7]

Answer:

Look at the diagrams for 2 and 3.

Explanation:

1. There are two ways to categorize waves.

Direction of particles of the wave:

If you need to differentiate them based on direction of particles of the waves then you have either longitudinal or transverse.

Particles of the medium of longitudinal waves move parallel to the direction or movement of the wave. On the other hand, transverse waves are waves where the particles of the medium it travels through move perpendicular to the motion of the wave.

Ability to transmit energy through a medium or vacuum

You have the mechanical wave and the electromagenetic wave (em wave).

The main difference between these two is that mechanical waves travel through a medium. Basically, they need the molecules in the medium, which collide or bump into each other to pass on the energy. An example would be sound waves.

Electromagnetic waves differ because they do not need a medium. They can travel through a vacuum. Like light waves.

Crest - It is the displacement of a wave in the upwards direction. In short it is the peak or the highest point of a wave.

Trough - It is the opposite of the crest, so it is the displacement of a wave going downwards. To put it shortly, it is the depth or lowest point of a wave.

If you will get the distance between the crest and trough, you will see that it is twice the measure of the amplitude, which you will be defined later on.

Wavelength - is the distance between two crests or two troughs of two consecutive waves. It is measured in meters and goes with the direction of the wave.

Amplitude - height or depth of the crest or trough from the rest position. It is also measured in meters. It is defined as the displacement of the wave from the rest position or point.

Look at image B, to see the different parts.

Standing waves are waves that vibrate vertically and have the same frequency and amplitude.

Nodes are points in the wave where the amplitude is equal to zero or at their resting point. Antinodes are points in the wave where the amplitudes are at their maximum.

Look at image C.

6 0

3 years ago