All categories

3 years ago

How was Mendeleev first periodic table like the periodic table today

Physics

1 answer:

Mila [183]3 years ago

5 0

Answer:

He began organizing the known elements according to their atomic weights and chemical properties.

Explanation:

You might be interested in

Consider the voltage/time graph shown below. What power supply is likely to be involved? Select one:

solniwko [45]

C a domestic power socket

5 0

4 years ago

Dimas reads that it takes 270 N to lift a firefighter's equipment. If a firefighter does 5400 J of work carrying the equipment u

Alex787 [66]

Answer:

h = 20 m

Explanation:

Given that,

Force to lift a firefighter's equipment, F = 270 N

Work done, W = 5400 J

We need to find the height climbed by the firefighter. We know that,

Work done, W = Fd

So,

$d=\dfrac{W}{F}\\\\d=\dfrac{5400}{270}\\\\d=20\ m$

So, the firefighter climb from a height of 20 m.

7 0

3 years ago

Read 2 more answers

Explain whether there can be forces act-

Xelga [282]

Technically friction is acting on the car because it is still rubbing against the street and gravity is pulling the car down preventing it from floating??? lol

5 0

3 years ago

A bowling ball has an initial momentum of +30 kg m/s and hits a stationary bowling pin. After the collision, the bowling ball le

mr Goodwill [35]

Answer:

+17 kg m/s

Explanation:

Question is missing. Found it on google:

"<em>What is the magnitude of the final momentum of the bowling pin if it has a mass of 1.5 kg</em>?"

Solution:

we can solve this problem by using the law of conservation of momentum. In fact, the total momentum of the system must be conserved, so we can write:

$p_i = p_f\\p_b+p_p=p_b'+p_p'$

where

$p_b = +30 kg m/s$ is the momentum of the ball before the collision

$p_p = 0$ is the momentum of the pin before the collision (zero because the pin is stationary)

$p_b' = +13 kg m/s$ is the momentum of the ball after the collision

$p_p'$ is the momentum of the pin after the collision

Solving the equation for $p_p'$ , we find:

$p_p' = p_b + p_p - p_b' = +30 +0 -(+13)=+17 kg m/s$

4 0

4 years ago

Imagine that you drop a shot put from a tower on the moon. How much

ella [17]

Answer: y = yo + Vyot + ayt = =2ay y− yo . 5. vy. 2. −voy. 2. =−2 g y− yo

Explanation: since both the displacement and acceleration are negative, they cancel each other when divided, so the result is positive. ... As you can see, as the height displacement (height) increases, the longer it takes for the robocopter to fall.

4 0

3 years ago