A rod of length L is pivoted about its left end and has a force F applied perpendicular to
A、F
B、2F
C、3F
D、4F
E、5F
F、6F
G、7F
A、F
B、2F
C、3F
D、4F
E、5F
F、6F
G、7F
A brass rod of length L = 0.75 m is twisted by torques T until the angle of rotation between the ends of the rod is. The allowable shear strain in the copper is 0.0005 rad. The maximum permissible diameter of the rod is approximately:
A、6.5 mm
B、8.6 mm
C、9.7 mm
D、12.3 mm
A uniform rod with lengthand masscan rotate about a horizontal axis from one end. A bullet with massstrikes the free end of the rod with a speed. The angular velocity of the rod after striking is
A、
B、
C、
D、
A rod of length 30.0 cm has linear density (mass per length) given by λ =50.0+20.0x where x is the distance from one end, measured in meters, and λ is in grams/meter. How far is its center of mass from the x =0 end? ___________cm
A.connecting rod
B.piston rod
C.bearing housing
D.none of the above
A thin rod is uniformly charged (Q, L). How much is the electric potential for point P in the figure? (3 significant numbers)
A thin rod is uniformly charged (Q, L). How much is the electric potential for point P in the figure?
A、
B、
C、
D、
A bullet hits into a hanged uniform rod, the total momentum and total angular momentum of the system are both conserved after collision. Where does the bullet hit?
A、r = l /3
B、r = l /2
C、r = 2l /3
D、r = 3l /4
For the cantilever beam with length l, the deflection at the free end is. If the beam length is reduced to one half of its original length, then the defection at the free end should be
A、
B、
C、
D、
The ratio of length (L) to diameter (D) of a reinforcing fiber is known as ______.
For the cantilever beam with length l, the deflection at the free end is. If the beam length is reduced to one half of its original length, then the deflection at the free end should be
A、
B、
C、
D、
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