Answer: The poker stick should have low thermal conductivity and high specific heat.
Explanation: For a poker stick that is non flammable, it should have some properties which will not let it heat up faster.
Two properties that satisfy the poker stick are:
- Specific heat
- Thermal conductivity
Specific heat is defined as the amount of heat require to raise the temperature of a mass M by 1 °C. More the specific heat, more amount of heat will be required to raise the temperature of a substance.
Thermal conductivity is defined as the ability of a substance to conduct heat. More thermal conductivity means that the substance will get hot faster as it will conduct more amount of heat.
So, for a substance that should not conduct more heat like the poker stick must have high specific heat and low thermal conductivity.
if we can't see air do fish see water ?
7(a) transpiration is faster in warmer dry air
(b)(I)xylem
(ii) 1. They are stacked end-to-end
2. Consists of dead cells
Mars Global Surveyors (MGS) and later orbiters found the following minerals on the Martian surface;
- Carbonate
- Sulfates
- Iron oxide
The Mars Global Surveyors (MGS) and later orbiters suggest that the Martian crust contains a higher percentage of volatile elements such as Sulphur and chlorine than the Earth's crust does.
These scientists also conclude that the most abundant chemical elements in the Martian crust are those found in Igneous rock.
These elements include the following;
- Silicon,
- Oxygen,
- Iron,
- Magnesium,
- Aluminum,
- Calcium, and
- Potassium.
They also, suggest that hydrogen is found in ice (water) while carbon is found in carbon dioxide and carbonates.
From the given options the minerals found in Martian surface include;
- Phyllosilicates ------ these are sheet of silicate minerals
- Carbonate
- Sulfates
- iron oxide
Learn more here: brainly.com/question/20470323
Answer:
1.64 rad/s
Explanation:
Given,
radius of merry-go-round, r = 1.80 m
mass of merry-go-round, M = 120 Kg
angular speed, ω = 0.350 rev/s
Initial angular speed = 2π x 0.350 = 2.12 rad/s
Mass of child, m = 36.5 Kg
Moment of inertia of the merry-go-round
L= I ω = 349.92 x 2.12 = 769.41 kgm²/s
Child moment of inertia
I₂ = m r^2 = 36.5 x 1.8² = 118.26 kg.m²
Final moment of inertia,
I_f = 349.92+118.26 = 468.18 kg.m²
Final speed = 
angular speed of the child is equal to 1.64 rad/s
