An object that is 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has magnitude 73 cm. (a) How far is the image from the vertex of the mirror? (b) What is the height of the image?
What will be an ideal response?
(a) 15 cm (b) 2.0 mm
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A steel plate weighing 27 kN is hoisted by a cable sling that has a clevis at each end. The pins through the clevises are 22 mm in diameter. Each half of the cable is at an angle of 358 to the vertical. The average shear stress in each pin is approximately:
(A) 22 MPa
(B) 28 MPa
(C) 40 MPa
(D) 48 MPa
A 0.38-kg block rests on a level surface and is attached to a horizontally aligned spring with a spring constant of 55.0 N/m. The block is initially displaced 4.8 cm from the equilibrium point and then released to set up a simple harmonic motion. A frictional force of 0.50 N exists between the block and surface. What is the speed of the block when it passes through the equilibrium point after
being released from the 4.8-cm displacement point? a. 0.21 m/s b. 0.32 m/s c. 0.64 m/s d. 0.46 m/s e. 1.8 m/s
Planet A has twice the mass of Planet B. From this information, what can we conclude about the escape speed for Planet A compared to that of Planet B?
A) The escape speed for Planet A must be twice as great as the escape speed from Planet B. B) The escape speed for Planet A must be four times as great as the escape speed from Planet B. C) The escape speed for Planet A is the same as the escape speed from Planet B. D) The escape speed for Planet A is greater than the escape speed from Planet B, but we cannot say how much greater. E) We cannot conclude anything about the escape speed for Planet A without knowing the radii of the two planets.
Equilibrium: A store's sign has a mass of 20 kg and is 3.0 m long. It is uniform, so its center of gravity is at the center of the sign. It is supported horizontally by a small loose bolt attached to the wall at one end and by a wire at the other end, as shown in the figure. What is the tension in the wire?
A. 460 N B. 230 N C. 120 N D. 200 N E. 300 N