Waves
How many colors are in the visible spectrum of a rainbow?
7
On Earth, about how many newtons does a 1 kg mass weigh?
10 N
What type of eclipse happens when Earth's shadow falls on the Moon?
lunar eclipse
How many chambers does the human heart have?
4 (Two atriums and two ventricles)
A tiny bird sings me high, and a big lion roars me low. Faster vibrations make me higher. What am I?
pitch
A 15 N force pushes a box right and a 35 N force pushes it left. What is the net force in newtons?
20
How many main layers does Earth have ?
4 (crust, mantle, outer core, inner core)
How many bones are in the adult human skeleton?
206
If the Sun suddenly stopped shining, the moon will disappear from night sky.why?
because , the moon reflects light
What force (in newtons) is needed to accelerate a 5 kg cart at 5 m/s²?
25 N
If Earth's axis had no tilt, what would happen to the seasons?
There would be no seasons; the weather would stay about the same all year
Which two body systems work together to get oxygen to your muscles when you run?
respiratory and circulatory system
A ball sitting at the top of a hill has this type of stored energy.
potential energy
Ali and his little sister each push an identical empty shopping cart with the same force. Then Ali fills his cart with heavy water bottles and pushes again with the same force.
Question: What happens to the motion of Ali's full cart, and why?
It speeds up more slowly. It has more mass, so the same force gives it less acceleration (Newton's Second Law)
When it is summer in Saudi Arabia, what season is it in Australia, and why?
Winter. The Southern Hemisphere is tilted away from the Sun, so it gets less direct sunlight
You touch a hot pan and pull your hand away before you even feel the pain. Which body system controls this fast reaction?
the nervous system Which called reflex
A student sees lightning first and hears the thunder a few seconds later. Why
"light travels faster than sound"
A swimmer pushes her feet hard against the pool wall at the start of a race and shoots forward through the water.
Question: What force moves the swimmer forward, and where does it come from?
The wall pushes back on her feet with an equal and opposite force. That reaction force moves her forward (Newton's Third Law).
What is the hardest natural material on Earth?
Diamond which is made up of carbon
Which tough bands of tissue connect muscles to bones?
tendons