A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. What is the speed of the block when it passes through the equilibrium point?
a. 2.1 m/s
c. 0.80 m/s
b. 1.6 m/s
d. 0.57 m/s
C
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Equilibrium: A 40-kg uniform ladder that is 5.0 m long is placed against a smooth wall at a height of h = 4.0 m, as shown in the figure. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction with the ladder is 0.40. An 80-kg bucket is suspended from the top rung of the ladder, just at the wall. What is the magnitude of the force that the ladder exerts on the wall?
A. 740 N B. 1300 N C. 980 N D. 900 N E. 1100 N
The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C. What is the charge on the object? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) -4.5 nC B) +4.5 nC C) -5.0 nC D) +5.0 nC
A straight wire of length l is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. If the resistance of the rod is R, what is the current through the rod?
a. R/Blv b. Blv/R c. B2l2v2/R2 d. not given
When a hydrogen electron is in its ground state, its principal quantum number is
a. zero. b. –13.6 eV. c. 1. d. +13.6 eV. e. none of these.