Answer:
Here's what I get
Explanation:
Potassium is in Group 1 and Period 4 of the Periodic Table.
Group 1 elements are called alkali metals.
In general, alkali metals have the following physical properties:
- Silvery white
- Soft enough to cut with a knife
- Relatively low melting points
- Good conductors of heat and electricity.
Their most obvious chemical properties are that they are highly reactive.
They react with atmospheric oxygen to form a dull coating of the metal oxide.
They all react with water to form hydrogen and a basic metal hydroxide.
The reaction of potassium with water (below) is quite vigorous.
Answer:
This question appear incomplete
Explanation:
This question appear incomplete because of the absence of the time the honeybee spent while travelling from the hive. However, if we are to assume that the honeybee spent the same amount of time leaving/travelling as when it was returning. Then the formula to be used is
Speed = distance ÷ time
distance = speed × time
distance = 4 × 1
distance = 4 miles
To determine the displacement of the honeybee, the total distance covered by the honeybee in both to and fro journey will have to be summed (this is because displacement is a vector quantity).
Assuming the the speed and time spent while returning is the same with those spent while leaving, then the displacement will be distance × 2 (sum of all the distance covered)
Thus; 4 × 2 = 8 miles
Explanation:
Formula to determine the critical crack is as follows.
= 1, = 24.1
[/tex]\sigma_{y}[/tex] = 570
and,
= 427.5
Hence, we will calculate the critical crack length as follows.
a =
=
=
Therefore, largest size is as follows.
Largest size = 2a
=
=
Thus, we can conclude that the critical crack length for a through crack contained within the given plate is .
A substance could have physical characteristics and chemical ones too, which are unique to the certain substance.
Color, odor, and how hard the substance, are all examples of physical characteristics of a substance.
Toxicity, flammability, and acidity, are all examples of chemical characteristics of a substance.
Answer:
Gravitational potential energy,
Explanation:
Mass of an Egyptian pyramid,
It is placed 19 m above the surrounding ground, h = 19 m
We need to find the gravitational potential energy store in the pyramid. This energy is possessed by an object due to its position. It is given by :
So, the gravitational potential energy store in the pyramid is . Hence, this is the required solution.