All categories

3 years ago

People, animals, and all matter on Earth are

Physics

1 answer:

NemiM [27]3 years ago

6 0

Answer:

Explanation:

To answer this, we can use process of elimination.

B: This question states that all matter has gravity. This is not correct. All matter is *effected* by gravity, but we do not have gravity inside of us.

C: If this were the case, we would all be floating off into space.

D: Same issue as question B.

You might be interested in

) to keep a door closed, a wooden stick is wedged between the floor and the doorknob. the stick exerts at b a 175 n force direct

zhenek [66]

The 175 N force is in the path A to B since a stick can’t pull the doorknob, this can be written as:

(F ) ⃗= 175⋅(73i ⃗+990 j ⃗+494 k ⃗)/(√73² +990²+ 494² )
(F ) ⃗=(11.5i ⃗+156 j ⃗+78.0k ⃗ )N

The displacement form C to B is:
(r ⃗ )_(B/C)=(683 i ⃗+860 j ⃗+0k ⃗ )mm

The formula for the moment about C is
M ⃗_c= (r ⃗ )_(B/C) x (F ) ⃗
M ⃗_c= (683 i ⃗+860 j ⃗ ) x (683 i ⃗+860 j ⃗+0k ⃗ )mm.N
M ⃗_c= (67.1 i ⃗+53.3 j ⃗+116 k ⃗ )m.N

7 0

3 years ago

How many electrons does a neutral atom of oxygen-18 have? 8 O 16.00

galina1969 [7]

Answer:

A. 8

Explanation:

Atomic number of oxygen = 8

Oxygen is the 8th element in periodic table.

Atomic no. = 8, means one oxygen atom has 8 protons. Now, because the atom is neutral, so number of electrons = no. of protons in an atom.

Hence, the number of electrons in a neutral oxygen atom is 8.

7 0

3 years ago

Read 2 more answers

A 7.5kg block is sliding down a wall with constant velocity. The coefficient of static friction between the block and the wall

weqwewe [10]

Ok, a couple of things have to be accounted for here. First, since the block is moving relative to the wall we have to use the kinetic coefficient of friction, 0.40. The second consideration is that since the block is moving at a constant velocity, the acceleration is zero. This means, by Newton's second Law, that the net force is zero. So the force of gravity must be equal to the friction force of the wall resisting its fall. This friction force is the product of the normal force (which we are seeking) and the kinetic coefficient of friction. We can then set these two forces equal:

$F_{gravity}=mg \\ \\ F_{friction}=F_{norm} \mu_k \\ \\ mg=F_{norm} \mu_k \\ \\ F_{norm}= \frac{mg}{ \mu_k} \\ \\ F_{norm}= \frac{7.5(9.79)}{0.4}=183.6N$

8 0

4 years ago

How much potassium nitrate, KNO3, would completely dissolve in 100g of water at 40℃?

const2013 [10]

Ok I know this from other stuff potassium nitrate would completely dissolve in a 100 g on was at 30 c would be 60 but this is 40 so I’m not really sure and I don’t what to ok give you a bad grade but if I had to guess I would go with 65 grams

8 0

3 years ago

A person stands 35.0 m from a flag pole. With a protractor at eye level, he finds that the angle to the top of the flag pole is

Phoenix [80]

Answer:

The flag is 16.321 meters high.

Explanation:

The situation is represented in the attached figure

In the figure we have

$tan(\theta )=\frac{H}{D}$

Given that

θ = 25.0 degrees

D = 35.0 meters

Applying values in the above equation we have

$tan(25)=\frac{H}{35.0}\\\\\therefore H=35.0\times tan(25^{o})=16.321meters$

6 0

3 years ago