The position function x(t) of a particle moving along an x axis is x = 5.00 - 6.00t2, with x in meters and t in seconds. (a) At what time and (b) where does the particle (momentarily) stop? At what (c) negative time and (d) positive time does the particle pass through the origin?
Concept.
1. 1.Chan in distance with respect to the time called velocity.
2. Velocity is zero when particle at rest.
3. When particle pass through the origin x = 0.
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You use a spring scale to suspend an object. The spring scale reads 7.84 N when the object is in air and 6.86 N when the object is immersed in water of density 1000 kg/m3. What is the density of the object?
A) 6000 kg/m3 B) 7000 kg/m3 C) 8000 kg/m3 D) 9000 kg/m3
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T that are perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A
When light reflects and produces a clear image, this reflection is referred to as:
a. retroreflection. c. diffuse reflection. b. specular reflection. d. double reflection.
The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center b. the Copernican system used elliptical planetary orbits c. the Copernican system used uniform circular motion d. the Copernican system assumed all planets orbited the Sun