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3 years ago

Which of the following statements are true?

Physics

1 answer:

Likurg_2 [28]3 years ago

4 0

Answer:

Explanation:

(A) True: It is true.

In junction law, the current entering at a junction is equal to teh current leaving at the junction.

(B) False: It is false.

The kirchhoff's junction law is based on the conservation of charge.

Energy is used in the circuit.

(D) True: It is true.

It is based on the conservation of charge.

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ear the end of a marathon race, the first two runners are separated by a distance of 45.0 m. The front runner has a velocity of

sesenic [268]

Answer:

a) $V_{2/1}=0.8m/s$

b) The second runner will win

c) d = 10.54m

Explanation:

For part (a):

$V_{2/1} = V_{2} - V_{1} = 0.8m/s$

For part (b) we will calculate the amount of time that takes both runners to cross the finish line:

$t_{1} = \frac{X_{1}}{V_{1}}=\frac{250}{3.45}=72.46s$

$t_{2} = \frac{X_{2}}{V_{2}}=\frac{250+45}{4.25}=69.41s$

Since it takes less time to the second runner to cross the finish line, we can say the she won the race.

For part (c), we know how much time it takes the second runner to win, so we just need the position of the first runner in that moment:

X1 = V1*t2 = 239.46m Since the finish line was 250m away:

d = 250m - 239.46m = 10.54m

6 0

3 years ago

Read 2 more answers

What is the change in momentum of a 50-kg rock that falls freely for 3 seconds?

Elan Coil [88]

Answer:

1470kgm/s

Explanation:

Given parameters:

Mass of the rock = 50kg

Time taken for the free fall = 3s

Unknown:

Change in momentum = ?

Solution:

The change in momentum will be difference between the ending momentum and finishing momentum.

Momentum is the product of mass and velocity

Momentum = mass x velocity

Initial momentum = 0, the velocity is 0

Final momentum = mass x final velocity

let us find the final velocity;

V = U + gt

V is the final velocity

U is the initial velocity

g is the acceleration due to gravity = 9.8m/s²

t is the time

V = 0 + 9.8x3 = 29.4m/s

So;

Change in momentum = 50 x 29,4 = 1470kgm/s

6 0

3 years ago

The word “virtual” refers to something that exists in effect but not in actual fact. How does this definition relate to the virt

atroni [7]

Because you see yourself the opposite way in a mirror. So yes your “seeing” yourself but not how everyone else sees you.

8 0

3 years ago

Read 2 more answers

Scientific laws explain_____.

arsen [322]

Howdy! I have your answer:

Scientific laws explain repeated observations that are experimental.

It also describes aspects of the universe.

~sofia

3 0

3 years ago

The concept of photons applies to which regions of the electromagnetic spectrum?

Amanda [17]

Answer:

D. all regions of the spectrum

Explanation:

I did some research ; )

7 0

3 years ago