Which of the following is an example of the type of force that acts at a distance?
a. gravitational
b. magnetic
c. electrical
d. all of the above
d
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A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time?
A) 100 m B) 200 m C) 300 m D) 400 m E) none of the above
The amount of potential energy possessed by an elevated object is
A) relative to a chosen reference level. B) equal to the work done in lifting it. C) equal to the kinetic energy it will acquire when freely falling to its reference level. D) all of the above
Describe the seafloor spreading theory
What will be an ideal response?
If a doubly-ionized oxygen atom is accelerated from rest by going through a potential difference of 10 V, what will be the change in its kinetic energy?
a. 10 eV c. 20 eV b. 40 eV d. none of the above