1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
soldi70 [24.7K]
3 years ago
15

A partially evacuated airtight container has a tight-fitting lid of surface area 79.9 cm2 and negligible mass. If the force requ

ired to remove the lid is 388 N and the atmospheric pressure is 1.00 × 105 Pa, what is the air pressure in the container before it is opened?
Physics
1 answer:
Julli [10]3 years ago
8 0

Answer:

P_1 = 5.14 \times 10^4 Pa

Explanation:

As we know that the air container is fixed by the lid on it and it is removed by external force

F = 388 N

now this external force must be same as the force due to pressure difference of the object

so it is given as

F = P_2 A - P_1 A

here we know that

A = 79.9 cm^2 = 79.9 \times 10^{-4} m^2

here we have

P_2 = 1.00 \times 10^5 Pa

now pressure is given as

P_1 = P_2 - \frac{F}{A}

P_1 = 1.0 \times 10^5 - \frac{388}{79.9 \times 10^{-4}}

P_1 = 5.14 \times 10^4 Pa

You might be interested in
f an arrow is shot upward on the moon with velocity of 35 m/s, its height (in meters) after t seconds is given by h(t)=35t−0.83t
inysia [295]

Answer:

The velocity of the arrow after 3 seconds is 30.02 m/s.

Explanation:

It is given that,

An arrow is shot upward on the moon with velocity of 35 m/s, its height after t seconds is given by the equation:

h(t)=35t-0.83t^2

We know that the rate of change of displacement is equal to the velocity of an object.

v(t)=\dfrac{dh(t)}{dt}\\\\v(t)=\dfrac{d(35t-0.83t^2)}{dt}\\\\v(t)=35-1.66t

Velocity of the arrow after 3 seconds will be :

v(t)=35-1.66t\\\\v(t)=35-1.66(3)\\\\v(t)=30.02\ m/s

So, the velocity of the arrow after 3 seconds is 30.02 m/s. Hence, this is the required solution.

7 0
3 years ago
Car 1 brakes to a stop on a dry road. Car 2 does the same thing, at the same speed, on a road where it has been raining. Explain
Zepler [3.9K]

Answer: car 1 is going how fast

Explanation: no need to answer without speed I won't know distance.

8 0
2 years ago
Two charged particles are placed 2.0 meters apart. The first charge is +2.0 E-6 C, and the second charge is +4.0 E-6 C. What is
ipn [44]
F = kq1q2/r^2 

<span>q1 is first charge </span>
<span>q2 is second charge </span>
<span>k is 9 E9 </span>
<span>r is distance between them </span>

<span>F = (9E9)(2 E-6)(4 E-6)/2^2 = 0.018 N </span>

<span>A postive answer indicates a repulsive force</span>
4 0
3 years ago
A train goes up a hill with a 15º incline. If the train has constant speed of 22 m/s, what are the vertical and horizontal compo
Kobotan [32]
Any two-dimensional vector in cartesian (x,y) coordinates can be broken down into individual horizontal and vertical components using trigonometry. If a train goes up a hill with 15 degree incline at a speed of 22 m/s, the horizontal component is 22cos(15)=21.3 m/s and the vertical component is 22sin(15)=5.5 m/s. 
8 0
3 years ago
you push a shopping cart with 2 packs of water bottles. you stop the cart and add two more packs. you push the cart again. does
HACTEHA [7]

Answer:

Yes

Explanation:

The cart will definitely behave differently because more weight is added to it.

In order to successfully push a cart, the applied force must exceed the force of the weight of the cart along with its constituents and the frictional force between the tyres and the floor.

<em>When more weights are added (the 2 packs of water bottles), it means that more force would be needed to overcome the opposing forces to the movement of the cart in order to successfully push the cart again.</em>

4 0
2 years ago
Other questions:
  • PART ONE
    7·1 answer
  • Convert 11 ppm into a percent
    11·1 answer
  • Frank has a sample of steel that has a mass of 80 grams if the density is 8g/cm3 what is the volume
    9·1 answer
  • A 96.0 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.240 m/s. How much work must be done on
    15·1 answer
  • What means of motion
    12·1 answer
  • Why do protons repel protons but attract electrons ??
    6·1 answer
  • Which is greater, an acceleration from
    5·1 answer
  • My Notes An electron is released from rest on the axis of a uniform positively charged ring, 0.500 m from the ring's center. If
    12·1 answer
  • An airplane flies for 1.25 hours with a constant speed of 1080 km/hr and then for another 2.5 hours with a constant speed of 984
    14·2 answers
  • Development occurs:
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!