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Carden
Questions (14)
A 0.409 kg block is attached to a horizontal spring that is at its equilibrium length, and whose force constant is 19.5 N/m. The
7 answers
1,570 views
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by
4 answers
816 views
You are holding a shopping basket at the grocery store with two 0.51 kg cartons of cereal at the left end of the basket. The
1 answer
1,106 views
Suppose now that the air carts below are both moving to the right initially. The cart to the left has a mass m1 and an initial
1 answer
659 views
A child sits in a wagon with a pile of 0.60 kg rocks. If she can throw each rock with a speed of 10 m/s relative to the ground,
1 answer
1,153 views
During a rescue operation, a 5350 kg helicopter hovers above a fixed point. The helicopter blades send air downward with a speed
1 answer
1,961 views
A 2.1 kg block slides with a speed of 1.1 m/s on a frictionless, horizontal surface until it encounters a spring.
(a) If the
1 answer
678 views
A 0.47 kg pendulum bob is attached to a string 1.2 m long. What is the change in the gravitational potential energy of the
7 answers
1,286 views
A 2.1 kg block slides with a speed of 1.1 m/s on a frictionless, horizontal surface until it encounters a spring.
(a) If the
0 answers
690 views
A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 27 m high. When it hits the ground at the base of the
5 answers
1,135 views
At a playground, a 18.7 kg child plays on a slide that drops through a height of 2.07 m. The child starts at rest at the top of
4 answers
2,585 views
At a playground, a 18.7 kg child plays on a slide that drops through a height of 2.07 m. The child starts at rest at the top of
1 answer
952 views
Catching a wave, a 65 kg surfer starts with a speed of 1.3 m/s, drops through a height of 2.10 m, and ends with a speed of 8.2
4 answers
465 views
The work required to stretch a certain spring from an elongation of 4.11 cm to an elongation of 5.11 cm is 32.0 J.
(a) Is the
2 answers
3,878 views
Answers (12)
when I set 1/2mv2 equal to 1/2kx2 I got .366
x = v * sqrt(m/k) correct?
I did m1v1 /(m1+m2) = vf = .252723 x = vf(m/k) x = .366
I got KE = 4.622 J and it isn't correct
I am just so confused by this problem. I have done other problems with ease and I'm having so much trouble with other ones.
KE initial = 0 PE initial = mgh = 68.8662 = KE final KE final = 1/2mv2 v = 23.01 That isn't right. What have I done wrong?
That's why I was getting it wrong. I kept using delta x which was one in both cases. Have I mentioned you are a lifeseaver.
Thank you, I understand that now.
I HAVE THE ANSWER. THANK YOU
thank you, I got it
1) my teacher is really bad. 2) Is delta potential energy = mgvf - mgvi
I'm still confused. How does that equal 1/2mv2 and how does that solve the problem.
