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ipn [44]
3 years ago
13

A constant voltage is applied across a circuit. If the resistance in the circuit is doubled, what is the effect on the power dis

sipated by the circuit? A) The power dissipated is quadrupled B) The power dissipated is reduced by a factor of 2.  C) The power dissipated is reduced by a factor of 4.  D) The power dissipated is doubled.  E) The power dissipated remains constant.        
Physics
1 answer:
kolbaska11 [484]3 years ago
6 0
B is the correct answer
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A train traveling at 27.5 m/s accelerates to 42.4 m/s over 75.0 s. What is the displacement of the train in this time period
Sergio [31]

Answer:

2621.25 meters

Explanation:

First, write down what we are given.

Initial velocity = 27.5 m/s

Final velocity = 42.4 m/s

Time = 75 seconds

We need to look at the kinematic equations and determine which one will be best.  In this case, we need an equation with distance.  I am going to use v_{f}^{2} = v_{i}^{2} +2ad, but you can also use the other equation, x = v_{o}t+\frac{1}{2}at^{2}

We need to find acceleration.  To find it, we need to use the formula for acceleration: a = \frac{v_{f}-v_{i}}{t}.  Plugging in values, a = \frac{42.4-27.5}{75} = .199\ m/s^{2}

Next, plug in what we know into the kinematics equation and solve for distance.  42.4^{2} = 27.5^{2} + 2(.199)(d)\\d = 2621.25\ meters

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