Answer:
<em>The stopping distance if the car skids is 225 ft</em>
Explanation:
<u>Friction</u>
It's a force that opposes movement and requires the interaction of two surfaces. If the interaction occurs from relative rest, then the friction force is greater than the case where the interactions occur from relative speed. The static coefficient is greater than the kinetic friction, and the relation is
If the car needs 180 ft to stop with slipping impending (no relative speed between the tires and the road), we can find the distance needed to stop the car in skidding conditions, which we expect to be greater.
This indicates that the friction forces have the same relation
Since the mass is the same:
Simplifying
Now we'll focus on the dynamic formulas. The acceleration can be computed from the initial speed vo, the final speed vf and the distance x:
This relation stands for both accelerations, which happen to be decelerations:
Where xk and xs are the distances needed to stop the car in each case. Note that vf and vo are the same since the test is done with the same values for both. Knowing the relation between the accelerations, we can have the relationship between the distances
Simplifying
Thus
Answer:
true
Explanation:
Throwback Thursday: When Volleyball Was Invented in Massachusetts. On this day in 1895, a Holyoke man created a game called 'mintonette
Answer:
100°C
Explanation:
The heat gained by the ice equals the heat lost by the steam, so the total heat transfer equals 0.
Heat lost by the steam as it cools to 100°C:
q = mCΔT
q = (3 kg) (2.00 kJ/kg/K) (100°C − 120°C)
q = -120 kJ
Total heat so far is negative.
Heat lost by the steam as it condenses:
q = -mL
q = -(3 kg) (2256 kJ/kg)
q = -6768 kJ
Heat absorbed by the ice as it warms to 0°C:
q = mCΔT
q = (6 kg) (2.11 kJ/kg/K) (0°C − (-40°C))
q = 506.4 kJ
Heat absorbed by the ice as it melts:
q = mL
q = (6 kg) (335 kJ/kg)
q = 2010 kJ
Heat absorbed by the water as it warms to 100°C:
q = mCΔT
q = (6 kg) (4.18 kJ/kg/K) (100°C − 0°C)
q = 2508 kJ
The total heat absorbed by the ice by heating it to 100°C is 5024.4 kJ.
If the steam is fully condensed, it loses a total of -6888 kJ.
Therefore, the steam does not fully condense. The equilibrium temperature is therefore 100°C
These are listed on the map, but A & B are 900', C is 1500', and D is 1000'
Answer:
17×10² km/h
10×10² mph
east to west
Explanation:
Circumference of Earth
Speed = Distance / Time
Converting to mph
The velocity of the plane must be 17×10² km/h or 10×10² mph
The plane must fly east to west