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3 years ago

The table shows the potential energy and kinetic energy of a skier at two different positions on a hill.

Physics

2 answers:

Rasek [7]3 years ago

8 0

Answer:

30,000 Units because, It remains unchanged.

Explanation:

Did the test, It's correct

Serggg [28]3 years ago

6 0

Answer:

30,000 units, because total energy remains unchanged

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Salem and Vernonville are 160 miles apart. A car leaves Salem traveling towards Vernonville, and another car leaves Vernonville

Paul [167]

Answer:

The speed of car leaves Vernonville = 45 miles per hour

The speed of car leaves Salem = 55 miles per hour

Explanation:

Given that distance between Salem and Vernonville = 160 miles

Lest take speed of car which leaves from Vernonville = V miles per hour

So the speed of car which leaves from Salem = V +10 miles per hour

These two car meet at time = 1 hr 36 min = 1.6 hr

Distance travel by car leaves from Salem = x

x= (V+10) x 1.6 --------1

Distance travel by car leaves from Vernonville = 160 - x

160 - x= V x 1.6 ----------2

From equation 1 and 2

160 - (V+10) x 1.6 = V x 1.6

V= 45 miles per hour

The speed of car leaves Vernonville = 45 miles per hour

The speed of car leaves Salem = 55 miles per hour

8 0

3 years ago

What force causes oppositely charged particles to attract each other?

Natasha_Volkova [10]

Answer:

The electromagnetic force.

8 0

3 years ago

You need to design a photodetector that can respond to the entire range of visible light. True or False

Rasek [7]

Answer: True

Explanation:

A photo detector that can respond to the entire rang of visible light can be design, it is true.

Photo detector is a device in an optical receiver which receives optical signals and convert it to electric signal. It is the key device position in front of the optical receiver.

7 0

3 years ago

I have an object that I want to know when it was made. I calculate that the object contains 0.12g of Iodine-131 but started with

Sav [38]

Answer: 71.72 days

Explanation:

This problem can be solved using the <u>Radioactive Half Life Formula: </u>

$A=A_{o}.2^{\frac{-t}{h}}$ (1)

Where:

$A=0.12 g$ is the final amount of Iodine-131

$A_{o}=60 g$ is the initial amount of Iodine-131

$t$ is the time elapsed

$h=8 days$ is the half life of Iodine-131

Knowing this, let's substitute the values and find $t$ from (1):

$0.12 g=(60 g)2^{\frac{-t}{8 days}}$ (2)

$\frac{0.12 g}{60g}=2^{\frac{-t}{8 days}}$ (3)

Applying natural logarithm in both sides:

$ln(\frac{0.12 g}{60g})=ln(2^{\frac{-t}{8 days}})$ (4)

$-6.21=-\frac{t}{8 days}ln(2)$ (5)

Finding $t$ :

$t=71.72 days$

7 0

4 years ago

A monkey runs 10\,\text m10m10, start text, m, end text to the right and then climbs 10 \,\text m10m10, start text, m, end text

Eduardwww [97]

Answer:

45º

Explanation:

6 0

3 years ago