1. C and D are the same ... and correct
2. K.E. is directly related to the mass and the square of the velocity
... adding two more students triples the K.E.
... doubling the velocity quadruples the K.E. ... because of the square factor
1. how does an inclined plane help make it easier to do work on a heavy object?
A. it reduces the amount of friction on the object
B. it reduces the total amount of work needed by increasing the force
C. It reduces the amount of force needed by increasing the distance
D. It reduces the amount of force needed by increasing the distance
2. a student is sledding down a hill traveling 6 m/s. The sled can fit up to three students. which change would increase the kinetic energy of the sled the most?
A. decrease the speed of the sled to 3 m/s
B. Increase the speed of the sled to 12 m/s
C. Add two more students to the sled traveling 6 m/s
D. Add one more student to the sled and decrease the speed to 3 m/s
3 answers
Note for #1 that both C and D say the same thing. That's the correct answer.
2. KE = 1/2 *m*v^2
You get more bang for the buck by choosing 12 m/s.
2. KE = 1/2 *m*v^2
You get more bang for the buck by choosing 12 m/s.
I’m screwed for the test:(