4 years ago

What is a good example of instantaneous speed

2 answers:

7 0

The speed indicated on your car's speedometer.

It tells nothing about what your speed was 1 second, 1 minute, or 1 hour ago, or what speed you've been averaging for the past 3 minutes. It only tells you what your speed is <em>RIGHT NOW</em>.

olga nikolaevna [1]4 years ago

3 0

Instantaneous speed is the motion rate of object at a particular time period or moment. If we take an example of a cheetah who is running with speed of 80 miles per hour then it is his instantaneous speed because it is shown as in per hour speed

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(a) What is the best coefficient of performance for a refrigerator that cools an environment at −30.0ºC and has heat transfer to

kari74 [83]

Answer:

a) 3.242

b) 1291.178 KJ

c) 3.59 cents

Explanation:

a) First all the temperature units should be in Kelvin. -30°C + 273.15 = 243.15K and 45°C + 273.15 = 318.15K. Coefficient of performance for refrigerator is COP = TL/(TH-TL) where TL is Lower Temperature and TH is the Higher Temperature. COP = 243.15/(318.15-243.15) = 3.242

b) COP = Cooling Effect/Work Input. Cooling Effect (or Desired Output) is 4186 kJ.

So Work Input = Cooling Effect/COP = 4186KJ/3.242= 1291.178 KJ

c) 3.6 MJ (3600kJ) is for 10 cents, using ratio for cost: energy used

$\frac{10}{3600 kJ} =\frac{x}{1291.178kJ}$