Question

a 2646lb car is moving on the freeway at 69 mph.

(a) Find the magnitude of its momentum and its kinetic energy in SI units.

(b) At what speed, in m/s, will the car's momentum be half of what it is in part (a).

(c) At what speed, in m/s, will the cats kinetic energy be half of what it is in part (a)

Answer 1

on b), twice the mass means twice the momentum and twice the energy.

a) change 65mph to m/s. To check that, put this in your google search window:
65miles/hr in m/s

Answer 2

If you are a teacher, which I doubt, you should have failed physics in college. If you are an imposter, stop it.

chyene:
a. change to SI units, monetum=massinKg*velocityinm/s

b. halve the speed to halve the momentum.

c. reduce the speed to speed/sqrt(2)=.707 speed

Answer 3

bobpursley, i am sorry your that way i past it and i am sorry i wrote it wrong

Answer 4

Ms.Black -- do you mean?

"Bobpursley, I am sorry you're that way. I passed it and I am sorry I wrote it wrong."

Answer 5

I am a teacher i am a 2nd grade if has been 19 years since i have done this level physics

Answer 6

You should provide a better English model for your students. Heaven help them if they don't know to capitalize I and that you're means you are. You apparently are not teaching them to begin sentences with capital letters and end them with periods.

Answer 7

I am a math teacher.

Answer 8

For 2nd grade? Please!!

It doesn't really matter what grade or subject you teach, if you can't write better in English than that, you have no business in a classroom.

Answer 9

Amen!