Answer:
4hrs
Explanation:
speed =72km/hr
distance= 300km
time =?
<h3>
<u>speed = distance/time</u></h3>
using this formula we make time the subject of the formula
time = distance/speed
time = 300/72
time = 4.1
therefore,
<em>time is equal to 4hrs</em>
Answer: that’s chemistry not physics
Explanation:
By using unit conversion, the energy released in kilocalories is 9.42 kcal.
We need to know about unit conversion to solve this problem. There are several energy units which able to explain how much the energy is such as calories and joule. The energy unit can be converted to another unit by unit conversion. The unit conversion of calorie to joule is
1 cal = 4.184 joule
From the question above, we know that
E = 39.4 kJ
By using the unit conversion, we can convert the energy into calorie
E = 39.4 kJ
E = 39.4 x 10³ J
E = 39.4 x 10³ / 4.184 cal
E = 9.42 x 10³ cal
E = 9.42 x 10³ /10³ kcal
E = 9.42 kcal
Hence, the energy released in kilocalories is 9.42 kcal.
Find more on unit conversion at: brainly.com/question/141163
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For this problem, you should be able to differentiate the variables presented from each other in order to substitute them in their corresponding places in the formula or formulas to be utilized in this problem. As for this problem, the only formula to be utilized would be the formula for power which is force multiplied to distance over time or simply have force multiplied to speed since speed is equal to distance over time.
The formula would like this:
Power = force x distance / time Power = force x speed
P = 490 N x 2 m / 10 s P = 490 N x (2 m / 10 s)
P = 980 N m / 10 s P = 490 N x 0.2 m / s
P = 98 W P = 98 W
So the average power required to lift a 490-newton object a vertical distance of 2.0 meters in 10 seconds would be 98 watts.
Answer:
Resistance
Explanation:
The energy is changed into light and heat energy in the case of light bulbs providing resistance. In the case of the toaster, it changes the electricity into heat, causing resistance.
