A ball of mass 5.0 kg is lifted off the floor a distance of 1.7 m. What is the g

Question

A ball of mass 5.0 kg is lifted off the floor a distance of 1.7 m. What is the gravitational potential energy of the ball at this height? Now the ball is released from rest and falls to the floor. What is the kinetic energy of the ball just before it hits the floor? Explain with & without calculation. What is its maximum velocity before hitting the floor? Which of the following is a definition of power? Power is the rate of change of flux. Power is the rate of change of energy. Power is the rate of change of momentum. Power is the rate of change of displacement. A 4.0 kilogram cart moving to the right and a 6.0 kilogram cart moving to the left on a horizontal frictionless surface. When the two carts collide they lock together. The magnitude of the total momentum of the two cart system after the collision is 30. kgm/s 6.0 kgm/s kgm/s 15 kgm/s

Explanation / Answer

A) PE=mgh
=(5kg)(9.8m/s^2)(1.7m) =83.3J

B) Total PE at the top =KE on the bottom
so, KE=PE therefore, KE= the PE found in part A
KE=1/2 mv^2
use PE for KE and find the velocity

C) Energy total= PE+KE
KE is same at different positions
Energy is conserved

2.power is the rate of change of energy

power is the rate of doing work. It is the amount of energy consumed per unit time.

3. It is the same as before the collision. Assume that momentum is positive when going toward the right then:

4x3 - 6x3 = -6kg.m/s

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.