PHYSICS MIDDLE SCHOOL

Gas pressure within a fixed container will increase when _____.1) gas is cooled
2) gas is heated
4) gas volume changes
5) mass of a gas is increased

Answers

Answer 1
Answer:

Answer:

2) gas is heated

Explanation:

In this problem, we have a gas in a fixed container (so, the volume of the gas does not change). Let's see what happens in the different situations listed in the question.

1) Gas is cooled. Since the volume if fixed, the work done by the gas is zero: W=p\Delta V = 0 This means that the change in internal energy of the gas is equal to the heat exchanged: \Delta U = Q. However, since the gas is cooled, this means that Q is negative (heat is removed from the gas), so \Delta U is negative, so the temperature of the gas, T, is decreased. Now if we look at the ideal gas equation

pV=nRT

We see that since V, n and R remain constant, a decrease in T corresponds to a decrease in p: so, the pressure of the gas decreases.

2) Gas is heated. If we apply exactly the same reasoning of point 1), we see that when the gas is heated, its temperature increases: therefore, according to the ideal gas equation, its pressure must increase as well.

3) Gas volume change. By looking again at the ideal gas equation:

pV=nRT

We see that in this case we don't have enough information to determine how does the gas pressure change. In fact, we don't know whether the volume V increases or decreases, so we cannot determine how p changes.

5) mass of a gas is increased. An increase in the mass of the gas corresponds to an increase in the number of moles, n. However, in the ideal gas equation, we don't know if the temperature of the gas, T, remains the same or not: therefore, we don't have enough information to tell how does p change.
Answer 2
Answer:

IS IT A MULTI CHOICE?? THEN SAY SO!!!

2 and 5 are the answers

Related Questions

In which of these situations, is mechanical energy being conserved? (Neglect, air resistance, friction and breaking) Check all that apply.Child on a swingPendulumBow and ArrowRoller Coaster
According to uniformitarianism, which statement is true? A. Weathering, erosion, and uplift occur slower now than in the past. B. Weathering, erosion, and uplift occur faster now than in the past. C. Weathering, erosion, and uplift occur at the same rates. D. Weathering, erosion, and uplift occur at the same rates now as they did in the past.
Is carbon dioxide a polar or non-polar molecule?
true or false? constructive interfernce occurs when a crest meets up with another crest at a given location along the medium
What does it mean when the line on a graph of a distance vs. time changes direction?

How much force is needed to get a 0.9kg block of wood to slide if the static coefficient of friction is 0.8

Answers

0.8?? DONT know how to solve

a baseball bat is in contact with a ball for 0.02 seconds, and exerts a force of 400 newtons. what is the impulse on the ball?​

Answers

Answer:

I=8 Nw.s

Explanation:

Impulse

It is a physical magnitude that measures the force applied to an object by the time that force is acting. It produces a change in the momentum of the object, which is expressed in the following formula

I=\Delta p=m(v_2-v_1)=F.t

We know the bat applies a force on the ball of F=400 N during t=0.02 sec, thus the impulse is

I=(400) (0.02)=8\ Nw.s

\boxed{I=8\ Nw.s}

. A projectile is fired with an initial velocity of 113 m słatan angle of 60.0degrees above the horizontal from the top of a cliff 49.0 m high.
Calculate:
(a) the time to reach maximum height
(b) the maximum height above the base of the cliff reached by the
projectile
(c) thetotal time it is in the air
(d) the horizontal range of the projectile.​

Answers

Answer:

a) 9.99 s

b) 538 m

c) 20.5 s

d) 1160 m

Explanation:

Given:

x₀ = 0 m

y₀ = 49.0 m

v₀ = 113 m/s

θ = 60.0°

aₓ = 0 m/s²

aᵧ = -9.8 m/s²

a) At the maximum height, the vertical velocity vᵧ = 0 m/s.  Find t.

vᵧ = aᵧ t + v₀ᵧ

(0 m/s) = (-9.8 m/s²) t + (113 sin 60.0° m/s)

t ≈ 9.99 s

b) At the maximum height, the vertical velocity vᵧ = 0 m/s.  Find y.

vᵧ² = v₀ᵧ² + 2aᵧ (y − y₀)

(0 m/s)² = (113 sin 60° m/s)² + 2 (-9.8 m/s²) (y − 49.0 m)

y ≈ 538 m

c) When the projectile lands, y = 0 m.  Find t.

y = y₀ + v₀ᵧ t + ½ aᵧ t²

(0 m) = (49.0 m) + (113 sin 60° m/s) t + ½ (-9.8 m/s²) t²

You'll need to solve using quadratic formula:

t ≈ -0.489, 20.5

Since negative time doesn't apply here, t ≈ 20.5 s.

d) When the projectile lands, y = 0 m.  Find x. (Use answer from part c).

x = x₀ + v₀ₓ t + ½ aₓ t²

x = (0 m) + (113 cos 60° m/s) (20.5 s) + ½ (0 m/s²) (20.5 s)²

x ≈ 1160 m

Balance P4O10+3H2O to 2H3PO4

Answers

the result you got it suppose to be 4H3PO4 therefore you balance it like this :
P4O10 + 6H2p ----> 4H3PO4

Which could be the factor that remains at the same phases of an experiment?A: observations
B:science
C: scientific methods
D: technology
E: controlled variables

Answers

Controlled variables are the factor that remains at the same phases of an experiment.

What is controlled variable?

Anything kept constant or constrained in a research study is referred to as a control variable. Despite not being relevant to the study's objectives, this variable is controlled because it might have an impact on the results.

Variables can be controlled either directly by maintaining their value throughout a study (for example, by maintaining a constant room temperature in an experiment) or indirectly by using techniques like randomization or statistical control (e.g., to account for participant characteristics like age in statistical tests).

Hence, controlled variables are that variables which are kept at the same phases of an experiment.

To learn more about controlled experiment, refer the link:

brainly.com/question/1537888

#SPJ6

the controlled varaibles aka E. because the control group is  Group of subjects in the experiment that experimental group as compared to

a graph is named mpg vs speed of a car traveling on a straight flat road. what does that name tell us about the graph

Answers

All of the other choices.

It's a graph of a vehicle's fuel efficiency ... what operating speeds make it use more or less gas to go 1 mile.
Other Questions
What is a Example of a subatomic particle
I'm giving out a lot of points for whoever helps me and answers correctly! 3 questions to answer! Please answer them ALL!!! :D1 - Which of these is a good example of Newton's First Law of inertia?A) A ball sits motionless on the groundB) A ball gathers speed as it rolls downhillC) A ball accelerates as it falls out of a classroom windowD) A ball returns to your hand after you throw it up in the air2 - The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle?A) The moon pulls more on the shuttleB) The earth pulls more on the shuttleC) Both are equal due to equal distancesD) Both are equal due to the mass of the shuttle3 - In which situation is the acceleration of the car negative?A) The velocity of the car was 75/h over 4 hoursB) The velocity of the car reduced from 50 km/h to 35 km/h over one minuteC) The velocity of a car increased from 40 km/h to 75 km/h over 15 minutesD) The velocity of a car was 45 km/h at 2:00 pm and at 4:00 pm the velocity of the car was 85 km/h
What is Fossil-rich limestone?
1.imagine you were able to throw a ball in a frictionless environment such as outer space.once you let go of the ball,what will happen to the ball according to the law of inertia?a.it will travel in a straight forever line b.it will travel striaight line but eventually slow down c.it will continue to speed up forever d.it will slow down and turn 2.a car accelerates down the road .what is the reaction to the tires pushing on the road? a.the car in the tires moving the car b.the masses of the car pushing on the tires c.the road pushing on the tires d.the road moving away from the tires