A car is moving with a velocity (3.0 m/s)x + (1.0 m/s)y and 3.0 seconds later its velocity is (6.0 m/s)x - (3.0 m/s)y. What is the direction of the average acceleration of the car?
A)
67° from the x-axis
B)
-67° from the x-axis
C)
53° from the x-axis
D)
-53° from the x-axis
E)
60° from the x-axis
D
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A cylindrical capacitor is made of two thin-walled concentric cylinders. The inner cylinder has radius r1 = 4.0 mm, and the outer one a radius r2 = 8.0 mm. The common length of the cylinders is L = 150 m
What is the potential energy stored in this capacitor when a potential difference 4.0 V is applied between the inner and outer cylinder? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 9.6 × 10-8 J B) 1.3 × 10-8 J C) 6.3 × 10-8 J D) 0.34 × 10-8 J E) 4.6 × 10-8 J
Suppose we use optical radiation (l = 500 nm) to determine the position of the electron to within the wavelength of the light. What will be the resulting uncertainty in the electron's velocity?
When a star collapses to form a black hole, its mass
A) increases. B) decreases. C) remains the same.
If a charge is located at the center of a spherical volume and the electric flux through the surface of the sphere is ?0, what is the flux through the surface if the radius of the sphere doubles?
A) 0.125 ?0 B) ?0 C) 5 ?0 D) 8 ?0 E) 0.500 ?0