A mass of 0.40 kg, hanging from a spring with a spring constant of 75.0 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through the equilibrium point? The starting displacement from equilibrium is 0.20 m
a. zero
b. 2.7 m/s
c. 3.9 m/s
d. 3.4 m/s
e. 0.55 m/s
b
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The circuit below contains 5 identical light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
A. A: The one closest to the positive terminal of the battery. B. A and C: The bulbs closest to the positive terminal of the battery. C. A and B: Because they are closest to the terminals of the battery. D. C and D: Because they receive current from A and B and from E. E. E: Because the potential difference across E is that of the battery.
A 13.4-g bullet is fired into a 1.60-kg block of wood which is suspended as a ballistic pendulum. The combined mass swings up to a height of 8.50 cm. What was the kinetic energy of the combined mass immediately after the collision?
a. 1.32 J b. 1.33 J c. 0.0112 J d. 1.34 J e. 0.137 J
What evidence supports the theory that elliptical galaxies come from denser clouds?
A) Elliptical galaxies are denser than spiral galaxies. B) Elliptical galaxies are generally larger than spiral galaxies. C) Elliptical galaxies at high redshifts lack young, blue stars. D) Elliptical galaxies have more gas than spiral galaxies. E) Elliptical galaxies have denser stars than spiral galaxies.
In fluid flow, the character of the flow can be determined by the Reynolds number, Re, which is a dimensionless quantity that can be expressed in terms of the speed v of the fluid, the density ? (mass per unit volume) of the fluid, the viscosity ?
of the fluid, and a length D which is characteristic to the flow. Re can be expressed in the form Re = kv?a?bDc, where k, a, b, and c are dimensionless constants. What must be the values of b, c, and d? The dimensions of viscosity are [M]/[L][T]. A) b = 1, c = -1, d = 1 B) b = 1, c = -1, d = -1 C) b = -1, c = 1, d = 1 D) b = -1, c = 1, d = -1 E) b = -1, c = -1, d = 1