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ValentinkaMS [17]

3 years ago

15

QUESTION 1

1 answer:

Xelga [282]3 years ago

8 0

Answer:the car is speeding up

Explanation:

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You are approaching a railroad crossing with no warning devices and are unable to see 400 feet down the tracks in one direction.

azamat

Answer: The speed limit is 15 mph when you come within 100 feet of a railroad crossing and you cannot see the tracks for 400 feet in both directions. You may go faster than 15 mph if the crossing is controlled by gates, a warning signal, or a flagman.

Explanation: hope this helps

4 0

2 years ago

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Adrianne has just poured a cup of hot coffee. When she grabs the cup, it is very hot because the heat has transferred from the c

andrezito [222]

Answer:

A

Explanation:

because it produces heat very fast

4 0

4 years ago

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A sharp knife cut things easily

Lostsunrise [7]

Answer:

its due to less surface area of action

pressure is high

4 0

3 years ago

Two kilograms of air is contained in a rigid wellinsulated tank with a volume of 0.6 m3 . The tank is fitted with a paddle wheel

wolverine [178]

Answer:

$0.3\ \text{m}^3/\text{kg}$

$36\ \text{kJ}$

$18\ \text{kJ/kg}$

Explanation:

V = Volume of air = $0.6\ \text{m}^3$

P = Power = 10 W

t = Time = 1 hour

m = Mass of air = 2 kg

Specific volume is given by

$v=\dfrac{V}{m}\\\Rightarrow v=\dfrac{0.6}{2}\\\Rightarrow v=0.3\ \text{m}^3/\text{kg}$

The specific volume at the final state is $0.3\ \text{m}^3/\text{kg}$

Work done is given by

$W=Pt\\\Rightarrow W=10\times 60\times 60\\\Rightarrow W=36000\ \text{J}=36\ \text{kJ}$

The energy transfer by work, is $36\ \text{kJ}$

Change in specific internal energy is given by

$\Delta u=\dfrac{Q}{m}+\dfrac{W}{m}\\\Rightarrow \Delta u=0+\dfrac{36}{2}\\\Rightarrow \Delta u=18\ \text{kJ/kg}$

The change in specific internal energy of the air is $18\ \text{kJ/kg}$

8 0

3 years ago

On Distance Displacement Position vs. Time graphs. Velocity vs. Time graphs, and Acceleration vs. Time graphs, which vanable is

MArishka [77]

Answer:

your question dosent make sense?

Explanation:

6 0

3 years ago