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4 years ago

Why is a control group important?

Physics

1 answer:

Likurg_2 [28]4 years ago

4 0

Answer:

A. It changes all the time, allowing us to see if the experimental group stays the same.

control group mean the thing the stay the same during the Experiment.

I hope this help

I hope this is correct

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If I wanted to generate a maximum emf of 20 V, what angular velocity (radians/sec, aka Hz) would be required given a circular co

MissTica

Answer:

35.36776 Hz

Explanation:

B = Magnetic field = $9\times 10^{-3}}\ T$

$E_m$ = Maximum voltage = 20 V

d = Diameter of coil = 40 cm = 0.4 m

A = Area = $\pi \frac{d}{2}^2=\pi 0.2^2$

N = Number of turns = 500

$\omega$ = Angular velocity

Maximum emf is given by

$E_m=NAB\omega\\\Rightarrow \omega=\frac{E_m}{NAB}\\\Rightarrow \omega=\frac{20}{500\times \pi\times 0.2^2\times 9\times 10^{-3}}\\\Rightarrow \omega=35.36776\ Hz$

The angular velocity would be 35.36776 Hz

8 0

4 years ago

The half-life of iodine-131 is 8 days. Chan Hee examines two samples of iodine-131. Sample 1: 10 g Sample 2: 20 g What can Chan

Illusion [34]

Chan Hee can expect to observe about the samples after 16 days is that three-fourths of each sample will have undergone radioactive decay. The best answer is letter B.

4 0

4 years ago

what mass of lead has the same volume as 1600 of alcohol ( density of lead =11300kg\m³ and density of alcohol=790kg\m³)

Misha Larkins [42]

The mass of lead = 22,939 kg

<h3>Further explanation</h3>

Given

mass alcohol=1600 kg

The density of lead =11300kg\m³ and density of alcohol=790kg\m³

Required

mass of lead

Solution

volume of alcohol

$\tt V=\dfrac{mass}{\rho}\\\\V=\dfrac{1600}{790}\\\\V=2.03~m^3$

the volume of lead=volume of alcohol=2.03 m, so the mass of lead :

$\tt m=\rho\times V\\\\m=11300\times 2.03\\\\m=22,939~kg$

7 0

3 years ago

When scientists publish experimental results their results are often criticized by other scientists how is this process a source

stiv31 [10]

Answer: It encourages scientists to give convincing evidence for the results

5 0

3 years ago

Speed is the ratio of the distance an object moves to (1 point)the amount of time needed to travel the distance.

Dennis_Churaev [7]

a) the distance an object moves to the amount of time needed to travel the distance.

i hope this helps :3

6 0

4 years ago