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2 years ago

What is the most likely reason that Mendeleev placed tellurium before iodine?

2 answers:

4 0

<span>Mendeleev observed that tellurium has chemical properties like other elements in its group, and he did not know that neutrons cause the greater atomic mass is the most likely reason.</span>

Law Incorporation [45]2 years ago

3 0

Answer:

Mendeleev observed that tellurium has chemical properties like other elements in its group, and he did not know that neutrons cause the greater atomic mass.

Explanation:

i just took the test and got a 100

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What are the change in internal energy if 250 j of hear is added to a system of 80 j of work is done by the system

Sphinxa [80]

Answer:

Explanation:

dU= dq+w

dU is change in internal energy of the system

dq is the amount heat added or released by the system which be positive or negative respectivelý

And w is the amount of work done by the system or on the system which will be positive or negative respectively.

Hence,

dU= 250+80= 330 J

The change will be positive

5 0

3 years ago

What is the average speed of a cheetah that runs 88 m in 5 seconds

vovangra [49]

So, the average speed of the Cheetah is 17.6 m/s.

<h3>Introduction</h3>

Hello ! I'm Deva from Brainly Indonesia. This time, I will help regarding the average speed. The average speed is obtained from finding the average of the speeds that occur or can be detected from the division between distance and travel time. The average speed can be formulated by :

$\boxed{\sf{\bold{\overline{v} = \frac{s}{t}}}}$

With the following condition :

$\sf{\overline{v}}$ = average speed (m/s)
s = shift or distance objects from initial movement (m)
t = interval of the time (s)

<h3>Problem Solving</h3>

We know that :

s = shift = 88 m
t = interval of the time = 5 seconds

What was asked :

$\sf{\overline{v}}$ = average speed = ... m/s

Step by step :

$\sf{\overline{v} = \frac{s}{t}}$

$\sf{\overline{v} = \frac{88}{5}}$

$\boxed{\sf{\overline{v} = 17.6 \: m/s}}$

So, the average speed of the Cheetah is 17.6 m/s.

5 0

2 years ago

While frying French fries, Wanda burned her hand. Burns are examples of a:

Alja [10]

Answer:

d. homeostatic imbalance

Explanation:

8 0

2 years ago

Read 2 more answers

A young 34-kg ice hockey goalie, originally at rest, catches a 0.145-kg hockey puck slapped at him at a speed of 34.5 m/s. In th

irinina [24]

The concept that we need to give solution to this problem is collision equation given by momentum conservation,

Our values are,

$m_2 = 0.145 kg\\u_2 = 34.5 m/s\\m_1 = 34 kg\\u_1 = 0$

Then,

Part A) We can here note that the velocity for the puck is zero (there is not a velocity in that direction)

$V_{goalie} = \frac{m_1-m_2}{m_1+m_2}V_{01} + \frac{2m_2}{m_1+m_2}V_{02}$

$V_{goalie} = \frac{34-0.145}{34+0.145}(0)+\frac{2*0.145}{34+0.145}(34.5)$

$V_{goalie} = 0.2930m/s$

Part B ) We apply the same solution but know we note that in the collision for the Goalie the velocity is zero.

$V_{puck} = \frac{m_1-m_2}{m_1+m_2}V_{02} + \frac{2m_2}{m_1+m_2}V_{01}$

$V_{puck} = \frac{34-0.145}{34+0.145}(34.5)+\frac{2*0.145}{34+0.145}(0)$

$V_{puck} = 34.20m/s$

7 0

2 years ago

Is there a change in speed from when a tennis ball first starts bouncing to when it is near the end of the bounce? How can you t

spin [16.1K]

Explanation:

The potential energy is stronger at the start of the bounce and when it is near the end bounce the balls accelerated rate will be lower because the force has decreased . Also I love your profile picture miraculous rocks !

8 0

2 years ago