A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The brick is kept from sliding down the plane by an ideal spring that is aligned with the surface and attached to a wall above the brick
The spring has a spring constant (force constant) of 120 N/m. By how much does the spring stretch with the brick attached?
A) 36 cm B) 360 cm C) 24 cm D) 14 cm E) 240 cm
D
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A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points?
a. 23 V b. 30 V c. 15 V d. 45 V e. 60 V
Tensile Stress and Strain: Which of the following are SI units of Young's modulus? (There could be more than one correct choice.)
A. N/m ? s2 B. kg/m2 C. kg ? m/s2 D. kg/m ? s2 E. kg ? m2/s2
Explain why, even though there are sound waves in space, it is still true that "no one can hear you scream" (assuming that the sound of your scream travels only through space, not through radio communication).
What will be an ideal response?
Each 2.0-m length of a long cylinder (radius = 4.0 mm) has a charge of 4.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point 5.0 mm from the axis of the cylinder?
a. 9.9 kN/C b. 8.1 kN/C c. 9.0 kN/C d. 7.2 kN/C e. 18 kN/C