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2 years ago

What is the atomic mass of an element?

1 answer:

5 0

Atomic mass is the mass of an atom, particle, or molecule. The atomic mass is determined by the number of protons and neutrons in the atom. For example, Oxygen has 8 protons (as seen by the atomic number) and 8 neutrons which gives oxygen an atomic mass of 16.

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You place a 55.0 kg box on a track that makes an angle of 28.0 degrees with the horizontal. The coefficient of static friction b

Radda [10]

Answer:

$\theta=34 \textdegree$

Explanation:

From the question we are told that:

Mass $m=55kg$

Angle $\theta =28.0$

Coefficient of static friction $\alpha =0.680$

Generally, the equation for Newtons second Law is mathematically given by

For

$\sum_y=0$

$N=mgcos \theta$

for

$\sum_x=0$

$F_{s}=mgsin\theta$

Where

$F_{s}=\alpha*N\\\\F_{s}=\alpha*m*gcos \theta$

$F_{s}=0.68*55*9.8*cos 28$

$F_{s}=323.62N$

Therefore

$\alpha mgcos \theta=mg sin \theta$

$\theta=tan^{-1}(0.68)$

$\theta=34 \textdegree$

6 0

1 year ago

Total resistance across any branch of a circuit can be found by analyzing whether the branch is connected in

atroni [7]

Answer: A.

series or parallel

Explanation:

Total resistance across any branch of a circuit can be found by analyzing whether the branch is connected in series or parallel.

The resistors are connected either in series or parallel. Therefore, the resistance of resistors across a circle can be calculated in series and parallel.

7 0

2 years ago

When water droplets in clouds become heavy, they fall to earth as _______ ?

nexus9112 [7]

Answer:D: Precipitation please give brainliest

Explanation: As liquid is heated by the sun's warmth, it changes into a gas form and rises in the atmosphere. In the air, water vapor cools and returns to a liquid form. ... These water droplets cling together and form clouds. When the droplets become heavy enough, they fall to the ground as precipitation.

6 0

2 years ago

The process of thinking that involves considering an overall general idea or theory and drawing specific conclusions or making s

Zigmanuir [339]

<h2>Answer:</h2>

Deductive reasoning

<h2>Explanation:</h2>

The process of using pre-existing knowledge to make logical conclusions, make predictions and draw out explanations is called reasoning. Reasoning are basically of two types:

i. Deductive reasoning: This takes a general rule, idea, or theory as foundation and then proceeds from there to draw meaningful conclusions or predictions. For example;

From above, following from equations (i) and (ii), it can be concluded that (iii) should be true.

ii. Inductive reasoning: While deductive reasoning moves from a general rule to specific rule, inductive reasoning does the opposite - moves from specific to a general rule.

7 0

2 years ago

a rescue line is to be thrown horizontally from the bridge of a cruise ship at 40.0 m above sea level to a life boat 50.0 m away

Gemiola [76]

There is a 40m drop from the bridge, so we can work out the time of the vertical component first (how long it will take to reach the water)

do this by using a SUVAT equation s=ut+0.5at^2
this rearranges to t= sqrt(2s/a)
- note that u has been removed since there is no initial velocity.

sqrt((2*40)/9.81)= 2.86 seconds

this means that the horizontal component of 50m has so be covered in 2.86s
and speed = distance/ time

50m/2.86s=17.48ms^-1

the line has to be thrown at 17.48ms^-1 or more to reach the life boat.

8 0

2 years ago