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3 years ago

"The toy car is about 3 inches long" is an example of a what observation?

Physics

1 answer:

Crazy boy [7]3 years ago

5 0

Answer:

It's a quantitative observation because it includes numerical data.

Explanation:

please mark brainliest if im correct

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On a transverse wave, the crest isa. the highest part of the wave.

Greeley [361]

I think it is C) the resting position of the wave.

3 0

3 years ago

You have a radioactive sample with a half-life of 1 hour. At t = 1 hour, a Geiger counter measures its radiation at 40 counts/mi

Mama L [17]

Answer:

Explanation:

Given that, .

The half-life of a radioactive element is

t½ = 1 hr.

At the first hour, the radioactive element has 40 counts/minute

After 4 hours it has 5 counts/minute

So,

We want to filled the table.

0 hours, I.e at the start

40 counts/mins × 2 = 80 counts / mis

First half-life (first hour) is

40 counts/mins

Second half-life (second hour)

40 counts/mins × ½ = 20 counts/mins

Third half-life (third hour)

40 counts/mins × ¼ = 10 counts / mins

Fourth half life (fourth hour)

40 counts/mins × ⅛ = 5 counts / mins

So, the table is

Time........................Geiger Counter Rate

0 hours.................... 80 counts / minutes

1 hour........................ 40 counts / minutes

2 hours..................... 20 counts / minutes

3 hours..................... 10counts / minutes

4 hours...................... 5 counts / minute

6 0

3 years ago

Why was Thompson's Plum pudding model a significant departure from previous models?

PSYCHO15rus [73]

Answer:

Thomson's cathode-ray tube experiments led him to develop the plum-pudding model, which stated that each atom had positively charged particles spread throughout its negatively charged matter. Reword the statement so it is true. ... More alpha particles were deflected than he expected.

Explanation:

Well.. I hope it helps you..

Just correct me if I'm wrong..

5 0

3 years ago

What is the energy in the spark produced by discharging the second capacitor? 1. The same as the discharge spark of the first ca

Nastasia [14]

Complete Question

The two isolated parallel plate capacitors be- low, one with plate separation d and the other with D > d, have the same plate area A and

are given the same charge Q.

What is the energy in the spark produced by discharging the second capacitor?

1. The same as the discharge spark of the first capacitor

2. More energetic than the discharge spark of the first capacitor

3. Less energetic than the discharge spark of the first capacitor

Answer:

The correct option is 2

Explanation:

The formula for the energy stored in the capacitor is

$U = \frac{Q^2}{2C}$

And generally the formula for finding the capacitance of a capacitor is

$C = \frac{\epsilon_oA}{d}$

We can denote the capacitance of the first capacitor as $C_1 = \frac{\epsilon_oA}{d}$

and denote the capacitance of the second capacitor as $C_2 = \frac{\epsilon_oA}{D}$

Looking at this formula we can see that C varies inversely with d

as D > d it means that $C_1 > C_2$

Since the charge is constant

$U\ \alpha\ \frac{1}{C}$ i.e U varies inversely with C

So $C_1 > C_2$ => $U_2 >U_1$

This means that the energy of spark would be more for capacitor two compared to capacitor one

The correct option is 2

6 0

4 years ago

What is the net work done on the 20kg block while it moves the 4 meters?

Vinil7 [7]

Answer:

The answer to your question is 784.8 J. None of your answer, did you forget some information?

Explanation:

Data

mass = 20 kg

distance = 4 m

work = ?

Formula

Work = force x distance

Force = mass x gravity

Process

1.- Calculate the weight of the block

Weight = 20 x 9.81

Weight = 196.2 N

2.- Calculate the work done

Work = 196.2 x 4

Work = 784.8 J

5 0

4 years ago