Now really, I have replied three times now. Yes
http://www.jiskha.com/display.cgi?id=1391014223
4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast?
A.the train has less kinectic energy than the car.
B.the train has more kinectic energy than the car.(I PICK THIS)
C.the train has the same kinectic energy as the car.
4 answers
Oh sorry, slightly different, train going v
for train
(1/2) m v^2 = 5,000 * 10^2
for car
(1/2) m v^2 = 1300 * 4 * 10^2
= 5,200 * 10^2
so now it is the car number A
for train
(1/2) m v^2 = 5,000 * 10^2
for car
(1/2) m v^2 = 1300 * 4 * 10^2
= 5,200 * 10^2
so now it is the car number A
The answer to the test is:
1.C
2.B
3.C
4.A
I have done this test. These answers are correct.
1.C
2.B
3.C
4.A
I have done this test. These answers are correct.
You are welcome.
11 answers