Question

Under normal atmospheric pressure on Earth: a. The pressure on you is 0. b. Going under 0.76 m of water in a pool will double the total amount of pressure on you. c. A total vacuum sucking on a tube dipped in a pool of mercury will not be able to pull mercury more than 0.76 m up the tube. d. Air has approximately the same density as it does at the top of the atmosphere. e. The pressure on you is equal to the force of gravity. f. The force on you is equal to 9.8 times the density of air. A block of Styrofoam and a block of lead both have the same volume. Under what conditions will they experience the same buoyant force? a. Both are completely submerged in the same fluid. b. The Styrofoam is floating and the lead is submerged. c. The Styrofoam is completely submerged in melted Styrofoam and the lead is completely submerged in melted lead. d. If the buoyant force is down. e. They are both submerged at the same depth of a fluid. f. If the depth of each is proportional to its density. If an AC/DC concert is at 120 dB and the intensity of the sound is 1 W/m2, what would be the intensity of the sound of a 140 dB jet engine? a. 1.166 W/m2. b. 1.33 W/m2. c. 1.5 W/m2. d. 2 W/m2. e. 21 W/m2. f. 100 W/m2. If person A is pushing with 20 N of force on a door 0.1 meters from the hinge and person B is pushing in the same direction with 20 N of force, but 0.2 meters from the hinge, how much force must be applied by person C in the opposite direction to keep the door from rotating, if he/she is pushing 1.0 meter from the hinge? (Assume all pushing is being done at right angles to the door.) a. 6 N. b. 10 N. c. 15 N. d. 20 N. e. 22 N. f. 40 N. Six objects are released in an identical manner at the same time on the same inclined plane. Which will be the LAST to roll all the way to the bottom? a. A solid sphere. b. A hollow sphere. c. A solid cylinder. d. A hollow cylinder. e. A hard boiled egg. f. A barbell (two solid round cylinders on each end connected by a narrow rod in the middle). Two waves each have amplitude A. They come together. At the point where they meet, the combined amplitude is: a. 0. b. A. c. 2A. d. âˆš2 * A. e. Anywhere from 0 to 2A. f. Anywhere from A to 2A. What can be said about an object that is in uniform circular motion? I. It is constantly accelerating inward toward the center of the circle. II. It is constantly accelerating outward away from the center of the circle. III. It is being pulled by a force toward the center of the circle. IV. It is being pulled by a force away from the center of the circle. V. It has a constant speed. VI. It has a constant velocity. A jet engine starts wide and gets narrower. As air goes from the wide to the narrow part, the air's: a. Speed increases and its pressure increases. b. Speed decreases and pressure increases. c. Speed increases and pressure decreases. d. Speed decreases and pressure decreases. e. Speed increases and pressure remains constant. f. Speed remains constant and pressure increases. g. Both speed and pressure remain constant.

Name: under normal atmospheric pressure on earth a the pressure on you is 0 b going under 076 m of water in a pool will double the total amount of pressure on you c a total vacuum sucking on a tub 27433
Uploaded: 2022-08-09T23:04:24-08:00
Duration: 13 min 30 s
Channel: Morgan Cheatham
Description: under normal atmospheric pressure on earth a the pressure on you is 0 b going under 076 m of water in a pool will double the total amount of pressure on you c a total vacuum sucking on a tub 27433

A block of Styrofoam and a block of lead both have the same volume. Under what conditions will they experience the same buoyant force?
a. Both are completely submerged in the same fluid.
b. The Styrofoam is floating and the lead is submerged.
c. The Styrofoam is completely submerged in melted Styrofoam and the lead is completely submerged in melted lead.
d. If the buoyant force is down.
e. They are both submerged at the same depth of a fluid.
f. If the depth of each is proportional to its density.

If an AC/DC concert is at 120 dB and the intensity of the sound is 1 W/m2, what would be the intensity of the sound of a 140 dB jet engine?
a. 1.166 W/m2.
b. 1.33 W/m2.
c. 1.5 W/m2.
d. 2 W/m2.
e. 21 W/m2.
f. 100 W/m2.

If person A is pushing with 20 N of force on a door 0.1 meters from the hinge and person B is pushing in the same direction with 20 N of force, but 0.2 meters from the hinge, how much force must be applied by person C in the opposite direction to keep the door from rotating, if he/she is pushing 1.0 meter from the hinge? (Assume all pushing is being done at right angles to the door.)
a. 6 N.
b. 10 N.
c. 15 N.
d. 20 N.
e. 22 N.
f. 40 N.

Six objects are released in an identical manner at the same time on the same inclined plane. Which will be the LAST to roll all the way to the bottom?
a. A solid sphere.
b. A hollow sphere.
c. A solid cylinder.
d. A hollow cylinder.
e. A hard boiled egg.
f. A barbell (two solid round cylinders on each end connected by a narrow rod in the middle).

Two waves each have amplitude A. They come together. At the point where they meet, the combined amplitude is:
a. 0.
b. A.
c. 2A.
d. âˆš2 * A.
e. Anywhere from 0 to 2A.
f. Anywhere from A to 2A.

What can be said about an object that is in uniform circular motion?
I. It is constantly accelerating inward toward the center of the circle.
II. It is constantly accelerating outward away from the center of the circle.
III. It is being pulled by a force toward the center of the circle.
IV. It is being pulled by a force away from the center of the circle.
V. It has a constant speed.
VI. It has a constant velocity.

A jet engine starts wide and gets narrower. As air goes from the wide to the narrow part, the air's:
a. Speed increases and its pressure increases.
b. Speed decreases and pressure increases.
c. Speed increases and pressure decreases.
d. Speed decreases and pressure decreases.
e. Speed increases and pressure remains constant.
f. Speed remains constant and pressure increases.
g. Both speed and pressure remain constant.

Added by Anna S.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Morgan Cheatham

08/09/2022

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- a. The pressure on you is 0. (Incorrect, atmospheric pressure is not zero) - b. Going under 0.76 m of water in a pool will double the total amount of pressure on you. (Incorrect, the pressure increase is not enough to double the atmospheric pressure) - c. A Show more…

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Under normal atmospheric pressure on Earth: a. The pressure on you is 0. b. Going under 0.76 m of water in a pool will double the total amount of pressure on you. c. A total vacuum sucking on a tube dipped in a pool of mercury will not be able to pull mercury more than 0.76 m up the tube. d. Air has approximately the same density as it does at the top of the atmosphere. e. The pressure on you is equal to the force of gravity. f. The force on you is equal to 9.8 times the density of air. A block of Styrofoam and a block of lead both have the same volume. Under what conditions will they experience the same buoyant force? a. Both are completely submerged in the same fluid. b. The Styrofoam is floating and the lead is submerged. c. The Styrofoam is completely submerged in melted Styrofoam and the lead is completely submerged in melted lead. d. If the buoyant force is down. e. They are both submerged at the same depth of a fluid. f. If the depth of each is proportional to its density. If an AC/DC concert is at 120 dB and the intensity of the sound is 1 W/m2, what would be the intensity of the sound of a 140 dB jet engine? a. 1.166 W/m2. b. 1.33 W/m2. c. 1.5 W/m2. d. 2 W/m2. e. 21 W/m2. f. 100 W/m2. If person A is pushing with 20 N of force on a door 0.1 meters from the hinge and person B is pushing in the same direction with 20 N of force, but 0.2 meters from the hinge, how much force must be applied by person C in the opposite direction to keep the door from rotating, if he/she is pushing 1.0 meter from the hinge? (Assume all pushing is being done at right angles to the door.) a. 6 N. b. 10 N. c. 15 N. d. 20 N. e. 22 N. f. 40 N. Six objects are released in an identical manner at the same time on the same inclined plane. Which will be the LAST to roll all the way to the bottom? a. A solid sphere. b. A hollow sphere. c. A solid cylinder. d. A hollow cylinder. e. A hard boiled egg. f. A barbell (two solid round cylinders on each end connected by a narrow rod in the middle). Two waves each have amplitude A. They come together. At the point where they meet, the combined amplitude is: a. 0. b. A. c. 2A. d. âˆš2 * A. e. Anywhere from 0 to 2A. f. Anywhere from A to 2A. What can be said about an object that is in uniform circular motion? I. It is constantly accelerating inward toward the center of the circle. II. It is constantly accelerating outward away from the center of the circle. III. It is being pulled by a force toward the center of the circle. IV. It is being pulled by a force away from the center of the circle. V. It has a constant speed. VI. It has a constant velocity. A jet engine starts wide and gets narrower. As air goes from the wide to the narrow part, the air's: a. Speed increases and its pressure increases. b. Speed decreases and pressure increases. c. Speed increases and pressure decreases. d. Speed decreases and pressure decreases. e. Speed increases and pressure remains constant. f. Speed remains constant and pressure increases. g. Both speed and pressure remain constant.

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Transcript

00:01 So you've got a bunch of multiple choice questions here.

00:05 Often what's really useful when solving multiple choice questions is to identify key words or phrases and then look up those words or phrases in your textbook, in your notes, or online to help you try and solve the problem.

00:22 So as we move into problem one under normal atmospheric pressure on earth, we're given a bunch of different options and they're all very different.

00:32 And so i think that in order to do this, we want to go process of elimination thinking about each individual option.

00:41 So for a, it says the pressure on you is zero.

00:44 Atmospheric pressure is not equal to zero.

00:47 Atmospheric pressure is 101 ,000 pascales.

00:51 So a can't be the correct answer.

00:55 For b, it says going under 0 .76 meters of water in a pool will double the total amount of pressure on you.

01:04 So now you want to try and determine what would be the pressure under 0 .76 meters of water.

01:13 That's something you can look up or calculate easily, and you'll find that it is not equal to atmospheric pressure.

01:21 So, again, that one can't be correct.

01:25 See a total vacuum sucking on a tube in a pool of mercury will not be able to pull mercury more than 0 .76 meters up the tube.

01:36 If you search for like mercury, height of mercury in a tube with a vacuum or something along those lines, you will see that the maximum height for mercury is 0 .76 meters.

01:54 So c seems to be true, but because i didn't know that off the bat, i want to make sure to look at the other answer choices.

02:03 So for d, air has approximately the same density as it does at the top of the atmosphere.

02:08 That is just not true.

02:10 The density of the atmosphere decreases as you move up.

02:15 And then e, the pressure on you is equal to the force of gravity.

02:21 That is not true because atmospheric pressure at sea.

02:26 C level is the same or very similar.

02:31 Whereas if it were equal to the force of gravity, the force of gravity is different for every object, but the atmospheric pressure on me and by computer are the same right now.

02:43 So that is not true.

02:46 And then lastly, f, the force on you is equal to 9 .8 times the density of air.

02:54 That is also not true.

02:56 If you do a simple unit analysis to try and figure out what the units of that would be.

03:04 If you were to multiply g times the density of air, you end up with units that are not the units of force.

03:12 So that also is not correct.

03:13 So c is our answer here.

03:17 For problem two, a block of styrofoam and a block of lead both have the same volume.

03:23 Under what conditions will they experience the same buoyant force? so for this, buoyant force is the sort of important piece of information.

03:33 And if we look up the buoyant force, we'll see that the buoyant force is going to be equal to the density of the fluid times the volume displaced times g.

03:48 So if both are in order for them to experience the same buoyant force, g is going to always be the same, but you also want the displaced volume and the density of the fluid to be the same.

04:08 So if they're both submerged in the same fluid and they are completely submerged because we know their volumes are the same, that means the displaced volume would be the same.

04:22 And so a here is the best answer choice.

04:28 For problem three, we're asked if an acdc concert is at 120 decibels, and the intensity of the sound is one watt per square meter, what would be the intensity of the sound of a 140 decibel jet engine? so for this one, you want to think about the relationship between intensity of a sound and sound level in decibels.

05:03 And i see when i do that, that when you add 10 to the decibel levels, that's the same as multiplying by 10 on the intensity level.

05:22 So from 120 to 140, we've added 20.

05:28 And so that's the same as multiplying by 10 twice or multiplying by 100.

05:38 So f here is the best answer.

05:44 For problem four, we have person a pushing with 20 newtons of force on a door, person b pushing in the same direction.

05:54 We want to know how much force should be applied by person c in the opposite direction to keep it from rotating...

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