Homework Statement
A satellite will crash int the Earth if its velocity:
stays constant
increases dramatically
decreases dramatically
Answer: decreases dramatically.??
Homework Statement
The acceleration due to gravity on the surface of the Earth is:
constantly changing
the same as on the moon
basically constant
Answer: Basically constant?
The gravity on Earth doesn't really change much day to day.
Thank you, I appreciate that. I am having a hard time figuring out how to put in the right formulas for this site.
But doing it again, I got 500 j. That right?
Homework Statement
If the velocity of a rocket is 10 meters per second and its mass is 10 kg, its kinetic energy is:
a. 5000 joules
b. 500 joules
c. 10000 joules
d. 1000 joules
[b]2. Homework Equations [/b)
Ek= (1/2) mv2
The Attempt at a Solution
e=(.5)10x10(2)
E=5000 j
1. Homework Statement
What type of energy does a blackboard eraser have when I hold it steady three feet about the ground?
a. potential energy
b. kinetic energy
c. electrical energy
d. spring elastic energy
I think it is kinetic energy. But I am confused on the differences of...
Homework Statement
What type of energy does a blackboard eraser have when I hold it steady three feet about the ground?
a. potential energy
b. kinetic energy
c. electrical energy
d. spring elastic energy
Homework Equations
none.
The Attempt at a Solution
I think it is...
Homework Statement
If I push on a chair with 20 Newtons of force, but it doesn't move, I have done _____ of work.
a. 20 joules
b. 200 joules
c. zero joules
d. 100 joules
Homework Equations
W=Force x Displacement
The Attempt at a Solution
0 joules =20x0
Homework Statement
Which object has the most momentum?
A. 5,000 kg truck parked on the road.
b. 2,000 kg car going 20 km/hour.
c. 3,000 kg car going 10 km/hour?
The Attempt at a Solution
I think it is C. 3,000 kg/10 km = 300