If the lever arm of a 9-N force is 6 m, what is the torque acting on the object due to this force?
a. 54 Nm
b. 1.5 Nm
c. 0.67 Nm
d. 15 Nm
e. cannot be determined
a
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A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
Exploitation of a resource only occasionally leads to greater development
What will be an ideal response?
Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 230 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.84 s, 206 m/s b. 8.39 s, 119 m/s c. 6.85 s, 150 m/s d. 9.69 s, 103 m/s e. 3.43 s, 292 m/s
What is neutrino oscillation?
a. The three flavors of neutrino mutating into one another. b. The vibration of neutrinos to create cosmic background radiation. c. The emission of electron neutrinos from the Sun. d. Vibrational motion of neutrinos on their way to Earth. e. The vibration of muon neutrinos that causes the creation of tau neutrinos.