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Wewaii [24]
4 years ago
9

A tank contains 0.568 mol of molecular nitrogen (N2). Determine the mass (in grams) of nitrogen that must be removed from the ta

nk in order to lower the pressure from 44.7 to 22.8 atm. Assume that the volume and temperature of the nitrogen in the tank do not change.
Physics
1 answer:
Marizza181 [45]4 years ago
8 0

Answer:

\Delta M = 7.812 gm

Explanation:

we know that for ideal gag we have

pV =nRT

Since volume, gas constant R and T are constant, so we have

\frac{p}{n]  = constant

\frac{44.7}{0.568} =\frac{22.8}{n}

n = 0.289 mole

hence mass removed\Delta M =( 0.568 - 0.289)*( molecular\ weight\ of \ nitrogen)

\Delta M = (0.568 - 0.289) *28 gm

\Delta M = 7.812 gm

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A tennis player swings her 1000 g racket with a speed of 10 m/s. She hits a 60 g tennis ball that was approaching her at a speed
Mashutka [201]

(a)

consider the motion of the tennis ball. lets assume the velocity of the tennis ball going towards the racket as positive and velocity of tennis ball going away from the racket as negative.

m = mass of the tennis ball = 60 g = 0.060 kg

v₀ = initial velocity of the tennis ball before being hit by racket = 20 m/s

v = final velocity of the tennis ball after being hit by racket = - 39 m/s

ΔP = change in momentum of the ball

change in momentum of the ball is given as

ΔP = m (v - v₀)

inserting the above values

ΔP = (0.060) (- 39 - 20)

ΔP = - 3.54 kgm/s

hence , magnitude of change in momentum : 3.54 kgm/s

7 0
3 years ago
An 0.80-m aluminum bar is held with its length parallel to the east-west direction and dropped from a bridge. Just before the ba
Dimas [21]

Answer:

a) B=2.9891\times 10^{-5}\,T

b)  west end of the bar is positive.

Explanation:

Given:

  • emf induced in the bar, \epsilon=5.5\times 10^{-4}\,V
  • length of the bar, l=0.8\,m
  • velocity of the bar at the given instant, v=23\,m.s^{-1}

(a)

The magnitude of the horizontal component of the Earth's magnetic field(B):

We know:

\epsilon=B.l.v

5.5\times 10^{-4}=B\times 0.8\times 23

B=2.9891\times 10^{-5}\,T

(b)

Using Fleming's left hand rule we determine that the current is flowing towards east end of the bar i.e. west end of the bar is positive.

4 0
3 years ago
The coefficient of static friction between car's tires and a level road is 0.80 If car to be stopped in time of 3.0 sec its spee
Vlad1618 [11]

Answer:

23.5 m/s

Explanation:

The velocity of the car in decelerated motion is given by

v = u + at

where

v = 0 is the final velocity

u is the initial velocity

a is the acceleration of the car

t = 3.0 s is the time it takes for the car to stop

The acceleration of the car is given by the frictional force, which is the only force acting on the car along the direction of motion, so:

ma = -\mu mg\\a = -\mu g = -(0.80)(9.8 m/s^2)=-7.84 m/s^2

where

\mu=0.80 is the coefficient of friction

Solving the previous equation for u, we find the initial velocity:

u=v-at=0-(-7.84 m/s^2)(3.0 s)=23.5 m/s

4 0
4 years ago
a bowling ball of mass 7.3 kg and radius 9.6 cm rolls without slipping down a lane at 3.1 m/s . part a calculate its total kinet
erma4kov [3.2K]

49 J   is the total kinetic energy. If a bowling ball of mass 7.3 kg and radius 9.6 cm rolls without slipping down a lane at 3.1 m/s. Kinetic energy is the energy an bowling ball has because of its motion.

Given:    m = 7.3 Kg ;  r = 9.4 cm = 0.094 m   ;   v = 3.1 m

Now total kinetic energy in this case is given by KE = Kinetic energy due to rotation  + Kinetic energy due to translation

i,e     KE = 1/2*m*v2   +   1/2*I*ω2      where   I is the moment of inertia of the bowling ball about it's center and ω is the angular velocity

Now for pure rotation (without slipping)    v = rω  

also for the ball (solid sphere)  I = 2/5*m*r2

Hence our kinetic energy becomes  

 KE = 1/2*m*v2 +  1/5*m*v2 = 7/10*m*v2

so   KE = 0.7*7.3*(3.1)2 = 49.10 J = 49 J

Learn more about kinetic energy here

brainly.com/question/12669551

#SPJ4

5 0
2 years ago
The ATC notices the airplanes NJ446 and DL267 are flying at the same speed on intersecting courses. What is the problem and what
Inessa05 [86]

Answer: Have one plane change altitude

Explanation:

8 0
3 years ago
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