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Ksju [112]
3 years ago
7

If in 30 mins Alex runs to a store that is 4 km away, what is her average speed in km/h

Physics
1 answer:
masha68 [24]3 years ago
6 0
15 km 30 divided by 4 is 7.5 km in 30 min times that by 2 the answer is 15
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The heating element of a water heater in an apartment building has a maximum power output of 37 kW. Four residents of the buildi
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Answer:

maximum possible temperature is 34.088°C

Explanation:

Given data

power output Q = 37 kW

volume flow rate = 11 x 10^-5 m3/s

temperature t = 14°C

to find out

maximum possible temperature T

solution

we can say

total water volume  = 4 residents  × volume flow

total water volume = 4 × 11 x 10^-5  = 44 × 10^-5 m³/s

so we say total water mass = 1000 × volume

total water mass = 1000 kg/m³ ×  44 × 10^-5  

total water mass = 0.44 kg

we know

dQ/dt = (dm/dt)× (S)× ( T - t)

so here we know specific heat of water S = 4.186 joule/gram °C

37 = 0.44 × 4.186 × (T-14)

T = 34.088°C

maximum possible temperature is 34.088°C

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3 years ago
True or False?<br><br> There are equal numbers of protons and electrons in neutral atoms.
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8 0
3 years ago
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A box is pulled 6 meters across the ground at a constant velocity by a horizontally applied force of 50 newtons. At the same tim
Vikentia [17]

Answer:

(a) Friction force = 50 N

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Explanation:

We have given that the box is pulled by 6 meter so d = 6 m

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We have have given that velocity is constant so acceleration will be zero

So to applied force will be utilized in balancing the friction force

So friction force F_{friction}=50N

Work done by friction force W_{friction}=F_{friction}\times d=50\times 6=300j

Work done by applied force W=F\times d=50\times 6=300j

So net work done = 300-300 = 0 j

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increase of green house gases is warming the oceans and melting sea ice at the poles. This causes changes in climate. Name three
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core, surface atmosphere

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