Ask question

Ask question

All categories

3 years ago

5

The pressure of a gas changes from 120 kPa. The volume changes from 45 L to 40 L. If the initial temperature is 81 c, what is th

e final temperature in C?

1 answer:

irina [24]3 years ago

7 0

Explanation:

we are not given the pressure change, check yhe question please

You might be interested in

Suppose you studied the velocity of a cheetah overtime after it starts running to chase an deer. After the linear fit, a spreads

EastWind [94]

Explanation:

While studying the velocity of a cheetah over time in a spreadsheet program is given by :

y = 2.2 x + 1.2 ...(1)

We know that,

v=v₀+at ...(2)

v₀ is velocity when t = 0, v is velocity after time t, a is acceleration and t is time.

If we consider time t on x-axis and v on y axis, then only we can draw a plot of equation (2). On comparing equation (1) and (2) we get :

a = 2.2 (but it is not correct as we don't know about axes).

Hence, the correct option is (a) "We cant tell without knowing what was plotted on the horizontal and vertical axes"

6 0

4 years ago

A sound wave has a frequency of 776 Hz in air and a wavelength of 0.52 m. What is the temperature of the air? Relate the speed o

OLEGan [10]

Answer:

142.7650889

Explanation:

I think the answer above is correct. So to find the velocity of the wave you can do: frequency*wavelength = velocity

in your case, the velocity is equal to 403.5m/s

so we know that the 403.52 is the total velocity of the wave

and the equation: velocity at 0 degrees Celsius * $\sqrt{{T}/{273}}$ where T represents temperature in Kelvins = veloctity

so we set 403.52 = 327* $\sqrt{{T}/{273}}$ and solve for T

T will then equal the degree in Kelvins

so to convert from Kelvins to degrees celsius you subtract 273 from the Kelvins value and you are left with the degrees in Celsius which equals 142.7650889 degrees Celsius

5 0

3 years ago

Mary travelled 70mph due north

tiny-mole [99]

Velocity because It is defined as the change in the position with respect to the time. Velocity is a vector quantity that means it depends on the magnitude and direction of an object. The S.I unit of velocity is, m/s

Acceleration : It is defined as the rate of change of velocity of an object wit respect to the time. Acceleration is a vector quantity that means it depends on the magnitude and direction of an object. The S.I unit of acceleration is, m/s to the power of 2

Distance : It is defined as the how far an object has traveled in time. Distance is a scalar quantity that means it is depends on the magnitude of an object only. The S.I unit of distance is, m

Speed : It is defined as the distance traveled by an object in unit time. Speed is also a scalar quantity. The S.I unit of speed is, m/s

Mary traveled 70 miles/hour due north. This is an example of velocity. 70 miles/hour tell us about the magnitude of the object and north tell us about the direction of an object.
Hence, the correct option is, velocity.

3 0

3 years ago

This is physics 11th grade and a homework question I don’t understand how to do this or what the question is asking me

Alexxx [7]

a) Frequency is the number of complete oscillations per second. Looking at the graph, there are 9 complete oscillations in 5 seconds. Thus,

Frequency = 9/5 = 1.8 oscillations per second

Frequency = 1.8 Hz

Period = 1/frequency = 1/1.8

Period = 0.056 s

b) When we differenctiate displacement with respect to time, the result is velocity.

Recall, period = 1/f = 5/9 cycles

1/4 cycle behind = 1/4 x 5/9 = 5/36

It is delayed with 5/36 sec with respect to displacement.

5/36 sec = 0.139 sec

Acceleration = first derivative of velocity = second derivative of displacement = 1/4 cycle behind velocity = 1/2 cycle behind displacement =

5/36 = 0.139 sec delayed with respect to velocity

= 5/18 = 0.2777 secs delayed with respect to displacement

Thus, the number of seconds out of phase with the displacements is 0.278 seconds

c) The formula for calculating the period of an ideal pendulum anywhere is

T = 2π√length/local gravity). We would calculate the local gravity.

From the information given,

length = 0.2

T = P = 5/9

Thus,

5/9 = 2π√0.2/local gravity)

(5/9)/2π = √0.2/local gravity

Square both sides. It becomes

[(5/9)/2π]^2 = 0.2/local gravity

local gravity = 0.2/[(5/9)/2π]^2

local gravity = 25.56 m/s^2

Thus,

acceleration due to gravity = 25.56 m/s^2

Recall, earth's gravity = 9.8 m/s^2

number of g forces = 25.56/9.8

number of g forces = 2.61

6 0

1 year ago

The force between two charges when they are 2 cm apart is

mixer [17]

Answer:

$q_1=9.9998\mu C$ and $q_2=0.0002\mu C$

Or

$q_1=0.00016\mu C$ and $q_2=9.99984\mu C$

Explanation:

We are given that

Force between two charges=0.036 N= $36\times 10^{-3}N$

Distance between two charges, r=2cm= $2\times 10^{-2}$ m

1m=100cm

Sum of two charges= $10\mu C$

Let one charge= $q_1=q\mu C=q\times 10^{-6}C$

$q_2=(10-q)\times 10^{-6} C$

We know that

Electric force between two charges

$F=\frac{kq_1q_2}{r^2}$

Where $k=\frac{1}{4\pi \epsilon_0}=9\times 10^{9}$

Using the formula

$36\times 10^{-3}=9\times 10^{9}\times \frac{q\times 10^{-6}\times(10-q)\times 10^{-6}}{(2\times 10^{-2})^2}$

$\frac{144\times 10^{-7}}{9\times 10^{9}\times 10^{-12}}=q(10-q)$

$0.0016=10q-q^2$

$q^2-10q+0.0016=0$

$10000q^2-100000q+16=0$

$q=\frac{100000\pm\sqrt{(100000)^2-4\times 10000\times 16}}{2\times 10000}$

Using the formula

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$q=9.999$ and $q=0.00016$

$q_2=10-9.9998=0.0002$

$q_2=10-0.00016=9.99984$

Hence, two charges are

$q_1=9.9998\mu C$ and $q_2=0.0002\mu C$

Or

$q_1=0.00016\mu C$ and $q_2=9.99984\mu C$

5 0

3 years ago