Find the sum of 46 and -46

defon

The correct answer is I disagree. Elements form all pure substances, but some pure substances include elements bonded together to form molecules and compounds.

Elements are pure substances but these elements also make other things such as water. The water molecule is made of two elements called oxygen and Hydrogen. Now water itself is a pure substance as it is chemically bonded hydrogen and Oxygen but it is composed of more than one element

3 0

4 years ago

A marble runs off the edge of a table that is 1.5 m high and the marble lands 0.50 m from the base of the table. a. How much tim

Free_Kalibri [48]

Answer:

t = 0.55[sg]; v = 0.9[m/s]

Explanation:

In order to solve this problem we must establish the initial conditions with which we can work.

y = initial elevation = - 1.5 [m]

x = landing distance = 0.5 [m]

We set "y" with a negative value, as this height is below the table level.

in the following equation (vy)o is equal to zero because there is no velocity in the y component.

therefore:

$y = (v_{y})_{o}*t - \frac{1}{2} *g*t^{2}\\ where:\\(v_{y})_{o}=0[m/s]\\t = time [sg]\\g = gravity = 9.81[\frac{m}{s^{2}}]\\ -1.5 = 0*t -4.905*t^{2} \\t = \sqrt{\frac{1.5}{4.905} } \\t=0.55[s]$

Now we can find the initial velocity, It is important to note that the initial velocity has velocity components only in the x-axis.

$(v_{x} )_{o} = \frac{x}{t} \\(v_{x} )_{o} = \frac{0.5}{0.55} \\(v_{x} )_{o} =0.9[m/s]$

3 0

4 years ago

An object is launched upwards at an initial speed of 3 m/s. What is the maximum height reached by the object from where it was l

ollegr [7]

Answer:

the maximum height reached by the object from where it was launched is 0.4591 m

Explanation:

initial speed of the object, u= 3 m/s

The velocity at the maximum height will always be 0.

Therefore, final velocity, v= 0 m/s

Using the Newton's equation of motion,

v^2 - u^2 = 2*g*h(max)

0 - u^2= 2*g*h(max)

h(max) = -u^2 /2* g

where g is the gravitational acceleration.

g= - 9.8 m/s^2

substituting the values in equation,

h(max)= - (3*3) / 2*(-9.8)

h(max) = 0.4591 m

the maximum height reached by the object from where it was launched is 0.4591 m

learn more about maximum height reached here:

brainly.com/question/20001249

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4 0

2 years ago

Which halogen is least likely to react?

ELEN [110]

Answer:

Iodine

Explanation:

fluorine is the most reactive

7 0

3 years ago

Choose the definition of: Kinesics

pav-90 [236]

Kinesics is the study of the interpretation body motion communication such as facial expressions and gestures. It does not include the verbal communication because you can communicate through words. Kinesics is a nonverbal communication that does not involve words. Example of this is when you are in a different country in which you do not know how to speak their native language. To understand their feelings, you don’t listen to their words but you observe their actions and facial structure when communicating. So the answer is letter A.

7 0

3 years ago