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zimovet [89]
3 years ago
15

you travel at an average speed of 20km/h in a straight line to get to your grandmother's house. it takes you 3 hours to get to h

er house. how far away is her house from where you started?
Physics
1 answer:
Serjik [45]3 years ago
4 0
Average Speed= Distance Travelled/Time Taken

20km/h=Distance Travelled/3hours

Distance Travelled=60 km
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One kilowatt-hour is equal to which of these values?
padilas [110]
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One hour = 60 × 60 = 3600 seconds

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Please answer all of these questions and you will get the brainlist
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Answer:

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3 years ago
A 234.0 g piece of lead is heated to 86.0oC and then dropped into a calorimeter containing 611.0 g of water that initally is at
Vaselesa [24]

Answer:24.70 ^{\circ}C

Explanation:

Given

mass of lead piece m_l=234 gm\approx 0.234 kg

mass of water in calorimeter m_w=611 gm\approx 0.611 kg

Initial temperature of water T_w=24^{\circ}C

Initial temperature of lead piece T_l=24^{\circ}C

we know heat capacity of lead and water are 125.604 J/kg-k and 4.184 kJ/kg-k respectively

Let us take T ^{\circ}C be the final temperature of the system

Conserving energy

heat lost by lead=heat gained by water

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0.234\times 125.604(86-T)=0.611\times 4.184\times 1000(T-24)

86-T=\frac{0.611\times 4.184\times 1000}{29.391}(T-24)

86-T=86.97T-2087.49

T=\frac{2173.491}{87.97}=24.70^{\circ}C

3 0
3 years ago
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