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3 years ago

15

Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles pe

r hour

2 answers:

Lorico [155]3 years ago

8 0

Speed = (distance / (time)

Speed = (60 miles) / (1.5 hours)

Speed = (60 / 1.5) (mile/hour)

<em>Speed = 40 miles/hour</em>

mafiozo [28]3 years ago

6 0

Answer: 40

Explanation:

I believe this is correct. I did 60/1.5 to get 40/mph

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After a package is dropped from the plane, how long will it take for it to reach sea level from the time it is dropped? assume t

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Time taken by the package to reach the sea level= 13.7 s

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3 years ago

Examine the lightbulbs in the circuit below. Write a sentence explaining what would happen if lightbulb A burned out. Repeat thi

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3 years ago

A lightweight vertical spring of force constant k has its lower end mounted on a table. You compress the spring by a distance d,

shusha [124]

Answer:

$v=d\sqrt{\frac{k}{m}}$

Explanation:

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$U_{0}+K_{0}=U_{f}+K_{f}$

In this case, since the block is moving from rest, the initial kinetic energy is zero. When the block loses contact with the spring, the final potential energy of the spring will be zero, so the equation simplifies to:

$U_{0}=K_{f}$

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$U_{0}=\frac{1}{2}kd^{2}$

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$K_{f}=\frac{1}{2}mv_{f}^{2}$

so we can now set them both equal to each other, so we get:

$=\frac{1}{2}kd^{2}=\frac{1}{2}mv_{f}^{2}$

This new equation can be simplified if we multiplied both sides of the equation by a 2, so we get:

$kd^{2}=mv_{f}^{2}$

so now we can solve this for the final velocity, so we get:

$v=d\sqrt{\frac{k}{m}}$

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2 years ago

Positive charge Q is placed on a conducting spherical shell with inner radius R1 and outer radius R2. The electric field at a po

gregori [183]

Answer:

E = 0 r <R₁

Explanation:

If we use Gauss's law

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6 0

2 years ago