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3 years ago

During a test, what can a student use to identify what type and how many atoms are in a chemical compound?

Physics

2 answers:

taurus [48]3 years ago

8 0

Answer:

the answer is actually chemical names

Explanation:

I took the test :p

11111nata11111 [884]3 years ago

5 0

Answer:

C- ths answer is the letter C

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You need to know the height of a tower, butdarkness obscures the ceiling. You note thata pendulum extending from the ceiling alm

AysviL [449]

Answer:

The towers height is 322m

Explanation:

We can assume that a simple pendulum hangs from the top of the tower.

In this case, the length of the pendulum will be the same as the height of the tower.

We will use the next expression then:

$T=(2pi)(\sqrt{L/g})$

Where T is the period, L is the pendulum length and g is the gravity $(9.81m/s^2)$

From the previous expression we will have then that the length will be:

$L=(g)*((T/2pi)^2)$

Replacing:

$L=(9.81m/s^2)*((36s/2pi)^2)$

The towers height will be then: 322m

8 0

3 years ago

What statement about energy transfer in a wave is true?

laila [671]

Answer:

Energy moves between the particle of the medium.

Explanation:

8 0

3 years ago

To determine an athlete's body fat, she is weighed first in air and then again while she's completely underwater. it is found th

il63 [147K]

The difference in weight is due to the displacement of water (the buoyancy of water is acting on the athlete thus giving her smaller weight).

The amount of weight displaced or the amount of buoyant force is:

Fb = 690 N - 48 N

Fb = 642 N

From newtons law, F = m*g. Using this formula, we can calculate for the mass of water displaced:

m of water displaced = 642N / 9.8m/s^2

m of water displaced = 65.5 kg

Assuming a water density of 1 kg/L, and using the formula volume = mass/density:

V of water displaced = 65.5kg / 1kg/L = 65.5 L

The volume of water displaced is equal to the volume of athlete. Therefore:

V of athlete = 65.5 L

The mass of athlete can also be calculated using, F = m*g

m of athlete = 690 N/ 9.8m/s^2

m of athlete = 70.41 kg

Knowing the volume and mass of athlete, her average density is therefore:

average density = 70.41 kg / 65.5 L

average density = 1.07 kg/L = 1.07 g/mL

5 0

3 years ago

Read 2 more answers

A scientific theory is_____.

natta225 [31]

Answer:

B. A well-tested explanation for a widely accepted hypothesis

Explanation:

This is true about a scientific theory going by the fact of it being a well tested explanation. For example, in one of the Newtons law of motion which he stated to be "To every action, there is equal and opposite reaction", the hypothesis has been known till he was able to offer a well tested explanations with calculations showing that, it was actually true.

6 0

3 years ago

Can work be done on a system if there is no motion?

Minchanka [31]

Answer:

D) No, because of the way work is defined

Explanation:

The work done on an object is given by:

$W=Fd cos \theta$

where

F is the force applied on the object

d is the displacement of the object

$\theta$ is the angle between the direction of the force and the displacement

From the formula, we observe that if there is no motion involved, then the displacement of the object is zero:

d = 0

As a result, the product in the formula is also zero, therefore the work done will be zero as well.

5 0

3 years ago