A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?
a. 3.6 kN up
b. 4.3 kN up
c. 2.9 kN down
d. 2.9 kN up
e. 5.8 kN down
b
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A. 3750 K B. 4140 K C. 4250 K D. 4790 K E. 5030 K
What index of refraction halves the wavelength that light has in a vacuum?
A. 1.33 B. 1.50 C. 1.41 D. 2.00 E. 5.00
Energy in Capacitors: Two parallel circular plates, each with a radius of 7.0 mm and carrying equal-magnitude surface charge densities of ±3.0 ?C/m2, are separated by a distance of 1.0 mm with only air between them. How much energy is stored in these plates? (?0 = 8.85 × 10-12 C2/N ? m2)
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Four identical particles (mass of each = 0.40 kg) are placed at the vertices of a rectangle (2.5 m × 4.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the mid-points of the shorter sides and is parallel to the longer sides?
A. 2.2 kg?m2 B. 2.8 kg?m2 C. 2.5 kg?m2 D. 3.1 kg?m2 E. 1.6 kg?m2