2. A student fires a 0.07 kg arrow at an object with mass m that is initially at rest on a frictionless surface. The speed of the arrow before the collision is 90 m/s. The speed when the arrow emerges from the object is v. What is the resulting velocity of the object?

The answer is: velocity of the object is 0.7m/s

Explanation:

Here , the explanation for the above answer is being explained below:-

Student fired an arrow object of mass 0.07kg which is initially at rest

Speed when the object emerged is v .

Object mass m = 1.5 kg Arrow emerging velocity v = 75 m/s

mv + mv = mv + mv

(0.07kg)(90m/s) + (1.5kg)(0m/s) = (0.07kg)(75m/s) + (1.5kg)(V2)

(6.3) + (0) = (5.25) + (1.5)(V2)

1.05 = (1.5)(V2)

V2 = 0.7m/s

So the resulting velocity of the object is 0.7m/s .

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).