Standing waves of frequency 57 Hz are produced on a string that has mass per unit length 0.0160 kg/m. With what tension must the string be stretched between two supports if adjacent nodes in the standing wave are to be 0.71 meters apart?
What will be an ideal response?
100 N
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A motor drives a shaft with diameter d 5 46 mm at f 5 5.25 Hz and delivers P 5 25 kW of power. The maximum shear stress in the shaft is approximately:
(A) 32 MPa
(B) 40 MPa
(C) 83 MPa
(D) 91 MPa
How many significant figures are in 0.0037010?
A) four B) five C) six D) seven E) eight
In a system with two moving objects, when a collision occurs between the objects:
a. the total kinetic energy is always conserved. b. the total momentum is always conserved. c. the total kinetic energy and total momentum are always conserved. d. neither the kinetic energy nor the momentum is conserved.
Lasers are used to create holograms because
A. they are cool B. they exhibit high coherence C. they are red D. they have lots of energy