HEAT
What is heat
Heat is a form of energy that flows from a warmer object to a cooler object because of a difference in temperature
What is temperature?
Temperature is the measure of how hot or cold an object is.
What is motion?
Motion is a change in the position of an object over time with respect to its surroundings.
What is the standard International System of Units (SI unit) used for measuring length?
The standard SI unit for length is the metre (m).
An astronaut sees two asteroids collide in space but hears nothing. Why?
Sound needs a medium (like air) to travel, and space is a vacuum.
If you place a metal spoon in a cup of hot soup, the handle of the spoon soon becomes hot. Which method of heat transfer is this?
Conduction. This is the transfer of heat between objects that are touching each other directly.
What is wrong with the sentence: The boiling point of water in celsius is 98.265.
"C" should be capital in Celsius. The boiling point of Celsius is 100 °C, and the symbol C is not present after 98.265 °C
If a car is driving down a completely straight road without turning, what type of motion is it showing?
It is showing rectilinear motion (or straight-line motion).
Why can we not use a handspan, footstep, or arm length as a standard unit of measurement?
Body parts vary in size from person to person. Using them would cause inconsistent and inaccurate measurements. Standard units ensure that measurements are the same for everyone.
What is the closest star to Earth except the Sun?
Proxima Centauri.
Why does warm air rise above a burning campfire?
Convection. When air gets warm, it expands, becomes lighter (less dense), and floats upward.
212°F is
100oC or 373 K ("o" is degrees)
What is the difference between circular motion and rotational motion?
If a tailor wants to measure the circumference of your chest for a shirt, will they use a wooden meter scale or a flexible measuring tape? Why?
They will use a flexible measuring tape. A wooden meter scale is rigid and cannot bend around curved surfaces like a chest.
A funhouse mirror keeps your face normal but stretches your body out thin. What shape is the mirror?
A cylindrical convex mirror.
A thermometer. It measures temperature, usually in degrees Celsius (°C) or Fahrenheit (°F).
What is the average body temperature of a human?
37oC or 98.6°F.
Why is the swinging of a playground swing called periodic motion?
Because the swing moves back and forth and repeats its motion at regular intervals of time.
While measuring a notebook with a ruler, the ruler's zero mark is broken. If you start measuring at the 2.0 cm mark and read 17.5 cm at the other end, what is the notebook's actual length?
The actual length is 15.5 cm.
A virus invades a cell and injects a double-stranded molecule to hijack its machinery. What is this blueprint molecule?
DNA
How does the heat from the Sun reach the Earth through empty space?
Radiation. Heat travels from the Sun through electromagnetic waves, which do not need air or matter to travel through.
K = C + 273 rounded. The answer to this is
373 K
A toy car travels a distance of 50 metres in 5 seconds. What is its speed?
The speed is 10 metres per second (m/s). You calculate this by dividing the distance by the time.
The distance between two towns is 4.5 kilometres. Convert this total distance into both metres (m) and centimetres (cm).
The distance is 4,500 metres or 450,000 centimetres.
What is a black hole and name one?
A black hole is a region in space where gravity is so strong that nothing, not even light, can escape it. One black hole is Sagittarius A*, a supermassive black hole located at the very center of our own Milky Way galaxy. It has a mass equal to about 4 million suns. [1, 2]