A car is initially moving at 30 m/s east and a little while later it is moving at 10 m/s north. Which of the following best describes the orientation of the average acceleration during this time interval?
a. north of west
c. west
b. northwest
d. north of east
A
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Regarding the energy efficiency of incandescent and fluorescent bulbs,
A) incandescent is more efficient because the electric current heats the wire filament directly. B) incandescent is more efficient because it uses electric current, which is a highly efficient energy form. C) fluorescent is more efficient because it does not use an actual electric current (a flow of electrons). D) fluorescent is more efficient because very little heating is involved. E) the two types have roughly equal efficiencies.
If a net force of 30 newtons is applied to a cart of mass 3 kg at rest, the velocity of the cart at the end of 5 meters will be ____ m/s
a. 5 b. 10 c. 12 d. 25 e. 30
Nanometer is a unit of _____
A) frequency B) energy C) mass D) length
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V b. 1.4 V c. 2.2 V d. 2.8 V e. 4.0 V