Pressure
A pin exerts a force of 1550N over an area of 0.05m^2 on a piece of paper. How much stress is on the paper from the pin?
31,000 N/m^2
State the definition of Density
The mass of a substance per unit volume
Which has more thermal energy?
A body of water in a swimming pool or water stored in a beaker?
A swimming pool has more thermal energy since it covers a larger area.
What is the Mars-sized plamet that collided with Earth millions of years ago?
Theia
What is moment?
The rotational or turning effect of a force
If a tire that has the constant temperature of 25°C inside then it decreases to 10°C the pressure drops. Why does gas pressure decrease?
There is less collisions of air particles in the tire resulting in less kinetic energy. This makes air molecules and particles collide the tires less frequently. Therefore, gas pressure decreases.
What is the reason Gold in its solid state has a higher density than in its liquid state?
The particles in its solid state, the particles are packed tightly and have a constant volume. However, if you melt solid gold, the volume increases this makes it that density of liquid gold is less than solid gold.
How is heat transferred in the process of conduction?
In conduction particles transfer energy by colliding with otherparticles when they vibrate.
What was the theory name that was originally thought that the moon split away?
Fission Theory
What is the formula for moment?
M = fd
Hypothetically, falling in quicksand is a deadly situation. What you do is spread your body. Why is this considered better than not spreading your body?
When you spread your body, you have a much larger surface area than just staying upright. This makes sure that the weight of your body si spread out over a large area making you sink slower. If you ever stand upright, your body's weight is concentrated over a small area which is your feet. This makes you sink faster
A cube has sides in a measurement of 2m and has a mass of 40kg. What is its density? Show your working out.
5kg/m3.
Volume of cube = 23 = 8m3
Density = Mass/Volume
Density = 40kg/8m3 = 5kg/m3
Why is metal a good conductor?
They have free electrons in their structures which lets heat adn energy transfer easily.
The gravity pulled the dust into a glowing ring of rock
If you apply 60N, 30cm away from the central point. What moment do you generate?
Give your answer in N/M
18 Nm
M=fd
M=(60N)*(0.3m)=18Nm
Two objects A and B reach underwater. Object A is at a depth of 17.80m underwater. While Object B is at a depth of 49.02m. Which Object has a higher chance of imploding from atmospheric pressure? Give your reasons.
(P.S: Ignore upthrust and other forces acting on the object.)
Object B has a higher chance of imploding. The reason for this is because the deeper you go underwater, the more particles there which results in more water particles colliding with Object B. Object A is only 17.80m underwater which means less particles are hitting Object A. This results in a lesser chance of implosion of Object A.
If an object has a density of 5kg/m3 and a volume of 10m3, what is its mass?
50kg
Mass = 5*10 = 50 = 50kg
3 processes of heat transfer?
Convection, Conduction and Radiation
What is the definition of a Satellite?
A satellite is any object, natural or artificial, that orbits a larger body in space, such as a planet or star.
If a seesaw has the turning effect of 500Nm and the force of a bike is applied with a force of 400N. What is the perpendicular distance away from the central point?
500Nm = 400N * dm
dm= 500Nm/400n
Dm= 1.25m
Pd= 1.25m
Two objects A and B have the same surface area of 10cm2. Object A has a mass of 10kg and Object B has a mass of 43kg. Object A and B are placed on two glass surfaces. Which object is more likely to break through the glass surface?
Make sure to include Earth's gravitational field of approximately 10N and also show your working out.
Object B is more likely to break through the glass surface.
Object A = 10kg * 10N = 100N
Object B = 43kg * 10N = 430N
P = N/A
Object A = 100N/10cm2 = 10N/cm2
Object B = 430N/10cm2 = 43N/cm2
Object B has more pressure than Object A with a difference of 33N/cm2
Explain the process of convection when you use an air conditioning system.
forced convection to cool rooms by using fans to push air over cold refrigerant coils, creating a circulating air current. The system releases cold, dense air from high positions (like ceiling units), which sinks, while warmer, less dense air rises to be captured and cooled, creating a continuous convective cycle that stabilizes room temperature
Types of satellites?
There two types
- Natural Satellites
- Artificial Satellites
If you have a seesaw, one cow is standing on the left side 2m away from the central point with a weight of 800N. Another cow is placed on the right side 2.5m away from the central point with a force of 600N. Which direction will the seesaw turn to? Make sure to also to find the difference between the turning effect of both animals to find which direction is directed to.
The seesaw will direct anti-clockwise with a difference of force 100N.
Cow 1 moment = 800*2 = 1600Nm
Cow 2 moment = 600*2.5 = 1500Nm
1600N-1500N = 100N