Decide if the following statements are true or false. Add an explanation for you

Question

Decide if the following statements are true or false. Add an explanation for your answer if you are uncertain. This may get you partial credit if your choice is incorrect. 1) A machine can never have an efficiency value higher than 100%. ___ 2) If the total momentum of a group of objects is zero, then none of the objects can be moving. ___ 3) Impulse is defined as the change of an object's kinetic energy. ___ 4) If an object's momentum is "conserved", it must have a nonzero impulse. ___ 5) Kinetic energy in some types of collisions is often "lost" as heat or sound. ___ 6) If the kinetic energy of an object (w/constant mass) changes, it MUST be accelerating. ___ 7) If an object is lifted off a surface on Earth, it is losing gravitational potential energy. ___ 8) Work can point in a negative direction because it's a vector. ___ 9) If any two objects have the exact same kinetic energy, they MUST also have the exact same velocity. ___ 10) If an object (w/constant mass) feels a nonzero net force, its momentum MUST change. ___

Explanation / Answer

Response to the true/false

a) True ( a machine can have never efficiency greater than 100%)

b)False .( the momentums of diffferent obejcts can add up to give 0 , if they are moving in opposite direction)

c False , impulse is change in momentum

d)False, it will have 0 impulse

e)true

f)false ,,,not true,...it can be retarding also ( decrease in velocity)

7) false, ...it is gaining gravtattional pE = mgh

8)false, work is scalaor

9)false...kE is a product of mass and velocity

10)true

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

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