Traditional incandescent light bulbs were used for many years and produce bright light, but the bulbs rapidly become too hot to touch. Halogen bulbs are slightly more efficient. Compact fluorescent light bulbs (CFL) and light-emitting diode light bulbs (LED) generate less thermal energy. Based on this information, what types of bulbs are most likely indicated by the illustration.
A) incandescent and halogen
B) incandescent and LED
C) halogen and CFL
D) CFL and LED
Answers: 3
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If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s
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(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?
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