Astronomy
What process powers the sun?
Nuclear fusion
vector- it includes direction
A net force is
the total force
What is the unit for work and the unit for power? Name both
work - Joule or J, power - Watt or W
What does the law of conservation of energy state?
Why do gamma rays have such high energy? Refer to the picture on page 2 of your study guide.
They have short wavelengths
What is the distance travelled of a runner that does 5 laps around the track? Each lap is 1 mile
5 miles
Calculate the force of an 3 kg object undergoing an acceleration of 5 m/s^2
15 N
How much work is done by a force of 20 N across a distance of 15 meters?
300 J
How do you calculate total mechanical energy?
Potential energy + kinetic energy
Which 2 factors does gravity depend on?
Mass and distance
What is the displacement of a runner that does 5 laps around the track? Each lap is 1 mile.
0
What is the net force on a box that is being pulled to the left with 10 N and pulled to the right with 25 N?
15 N to the right
How much power does a weightlifter have if they can exert 270 J of work in 3 seconds?
90 W
What is the PE of a 8 kg bowling ball that is at a height of 1.5 meters? Assume g =10
120 J
List the lifecycle of an average star (our sun)
1. protostar/stellar nebula
2. star
3. red giant
4. planetary nebula
5. white dwarf
What is the velocity of a paper airplane that travels 50 m East in 4 seconds?
12.5 m/s to the East
What are the 3 pieces of evidence for continental drift?
1. Fossils
2. Puzzle like fit
3. Glaciation
A 500 W lightbulb runs for 20 seconds. How much work was done?
2 J
What is the KE of a 2.5 kg cart that is traveling at a velocity of 5 m/s?
31.25 J
What are 3 pieces of evidence for the Big Bang Theory?
1) Cosmic Microwave Background Radiation
2) The universe is expanding
3) Element composition
What is the acceleration of a car that starts at rest and speeds up to 60 m/s in 3 seconds?
20 m/s ^2
Name and describe the 3 types of plate boundaries
1. convergent- collide
2. divergent- separate
3. transform- run along opposite directions
What work will gravity do when a 2 kg bowling ball is dropped a height of 3 meters? Assume g = 10
60 J
A ball is dropped from a height of 20 m and has a mass of 1 kg. What is the PE when it is halfway down? Assume g =10
100 J