A box of mass 72 kg is at rest on a horizontal frictionless surface. A constant horizontal force of magnitude F then is exerted on the box, accelerating it to the right. You observe that it takes the box 3.4 seconds to travel 13 meters
What is the magnitude of the force F?
160 N
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Wave Characteristics: Which one of the following is not an electromagnetic wave?
A. ultraviolet B. infrared C. radio waves D. sound waves E. gamma rays
An electron is briefly accelerated in the direction shown in the figure below and to the left. It creates an EM wave pulse that eventually reaches points P and S 
What is the direction of the wave’s motion at point P?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA
The last page of a book is numbered 764. The book is 3.0 cm thick. What is the average thickness of a sheet of paper in the book, in centimeters?
A) 0.0039 B) 0.0078 C) 127.3 D) 0.072 E) 254.7
The units gal/h can be converted to which of the following units?
(i) m/s (ii) cm/s2 (iii) mm3/y (iv) liters/acre
1.only (iii) 2.(i) and (iv) 3.(iii) and (iv) 4.(ii) and (iv)