A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the lowest point, where 
is the normal force, 
is weight, and ![]()
data-wiris-created="true" src="https://sciemce.com/media/2/ppg__cognero__Chapter_6_Applications_of_Newton_apos_s_Laws_of_Motion.__media__59f06246-91bf-453e-9918-b6af66fca219.PNG" style="vertical-align:middle;" /> is tension?
A.
B.
C.
D.
E.
Answer: B
You might also like to view...
A charged particle of enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T and the charge of the particle is +e, and the radius of the helical path is 8.9 cm, what is the particle’s mass?
a. 
b. 
c. insufficient information given.
d. 
Jovian planets
a. have rings and large numbers of moons. b. all have many moons, but only Saturn has rings. c. have moons, but Uranus and Neptune have only one or two. e. are massive and rotate slowly.
Total Internal Reflection: A light beam with wavelength 440 nm in a certain material then enters air and its wavelength becomes 577 nm.(a) What is the index of refraction for the material?(b) At what angle with the plane of the surface will the light be totally reflected back into the material?
Fill in the blank(s) with the appropriate word(s).
Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is
A) the wall pulling oppositely on the spring. B) the spring pulling on Harry. C) both the wall and the spring pulling on Harry. D) none of the above