A projectile is launched with an initial velocity of 80 m/s at 30° above the horizontal. Neglecting air, what is horizontal component of the projectile's acceleration?
A) 80 m/s2
B) 40 m/s2
C) 9.8 m/s2
D) 0 m/s2
E) 69 m/s2
D
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Ohm's Law: The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
Fill in the blank(s) with the appropriate word(s).
Water flows in a flexible tube of radius 1.5 cm at the floor level of a house. If the tube is joined to a second tube of smaller radius (1.2 cm), what is the speed of water in this smaller radius tube at a height of 7.2 m above the floor?
A. 8.9 m/s B. 4.5 m/s C. 13.9 m/s D. 11.1 m/s
What is the power of the combined lenses with individual powers of 8.0 diopters and 4.0 diopters?
A) 32 diopters B) 24 diopters C) 2.0 diopters D) 4.0 diopters E) 12 diopters
A charge of +80 ?C is placed on the x axis at x = 0 . A second charge of ?50 ?C is placed on the x axis at x = 50 cm. What is the magnitude of the electrostatic force on a third charge of 4.0 ?C placed on the x axis at x = 30 cm?
a. 13 N b. 77 N c. 39 N d. 25 N e. 45 N