PHYSICS HIGH SCHOOL

A mass of 2kg has a kinetic energy of 16J.what is the momentum of the body?

Answers

Answer 1

Answer:

Explanation:

mass - 2kg

energy - 16 j

k.e- 1/2mv

16j=1/2×2×v

16×2/2=v

16=v

√16=v

V=4m/s

then momentum =mv

= 2×4

= 8 kgm/s

Answer 2

Answer: Isisheikrsbgsueurihsjsbshwn

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PLEASE HELP ME Color corresponds to the ______________ of light waves. wave speed cycles wavelength

Which of the following does not represent a mechanical wave?sound
waves in the ocean
waves in a wheat field
light

Answers

The example that does not represent a mechanical wave is light. A mechanical wave requires a medium in order for it to travel and propagate. Examples of such is sound waves that travel through the air or ocean. Light is an electromagnetic wave because it makes use of particles called photons to propagate.

Which of the following does not represent a mechanical wave?

light

Of the waves listed, the one with the longest wavelength is a(n)a. X ray.
b. radio wave.
c. microwave.
d. visible light wave.

Answers

Of the waves listed, the one with the longest wavelength is the radio wave. The answer is letter B. They are the longest wave in the electromagnetic spectrum. It can either be a long wave or a short wave.

The sentence Walking the wire, my dog waited for the squirrel to fall is an example of _____.split infinitive
parallel structure
dangling participle
none of these

Answers

The answer is dangling participle. The dog wasn't walking the wire, the squirrel was. It is modifying the wrong noun.

Answer:

dangling participle

Explanation:

Britain and France signed an entente and became thea. Central Forces.
c. Central Powers.
b. Allied Forces.
d. Axis Powers.

Answers

Allied Forces. they became the allies.

I think B. Allied forces

Radium-226 is unstable. What is the process that allows the nucleus of radium-226 to become more stable? Question 14 options: A. ionic bonding B. radioactive decay C. hydrogen bonding D. covalent bonding E. nuclear fusion

Answers

Answer: The correct answer is Option B.

Explanation:

We are given a radioisotope which is unstable in nature. For this isotope to become stable, it has to undergo radioactive decay. There are various processes by which a radioisotope may decay:

1. Alpha decay: In this decay process, a heavier nuclei decays into lighter nuclei. The particle released is alpha particle.

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)\textrm{Y}+_2^4\alpha$

2) Gamma decay: In this decay process, an unstable nuclei gives excess energy by a process of spontaneous electromagnetic process. This decay process releases $\gamma -radiations$ .

$_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma$

3) Beta-plus decay: In this decay process, a neutron gats converted into a proton and an electron. The particle released is $\beta-particle$

$_Z^A\textrm{X}\rightarrow _(Z+1)^A\textrm{Y}+_0^(-1)\beta$

4) Beta-minus decay: In this decay process, a proton gets converted into a neutron and an electron neutrino which is known as a positron particle. This is also known as $\beta ^+$ -decay.

$_Z^A\textrm{X}\rightarrow _(Z-1)^A\textrm{Y}+_(+1)^0e$

Radium-226 nuclei undergoes alpha decay to form Radon-222 nuclei by releasing alpha-particle.

$_(88)^(226)\textrm{Ra}\rightarrow _(86)^(222)\textrm{Rn}+_2^4\alpha$

Hence, the answer is Option B.

the correct answer for this question is radio active decay or option b ! press brainliest...

A motorist is driving at 20m/s when she sees that a traffic light 200m ahead has just turned red. She knows that this light stays red for 15s, and she wants to reach the light just as it turns green again. It takes her 1.0s to step on the brakes and begin slowing. What is her speed as she reaches the light at the instant it turns green?

Answers

Answer:

8.57 m/s

Explanation:

let's list out available parameters:

Initial velocity, u = 20 m/s

Time = 15 - 1 = 14 s

Distance, s = 200 m

Final velocity = ?

We are assuming a uniformly accelerated motion.

Using one of the equations of motion $s = \left((u+v)/(2)\right)t$

$v = (2s)/(t)-u$

$v=(2*200)/(14)-20$

$v=28.6 - 20$

$v=8.6$ m/s

Final answer:

To stop just as the light turns green, the motorist needs to decelerate in a controlled manner. The effective time to cover the distance after seeing the red light is 14 seconds, disregarding the 1 second it takes to react and press the brakes. Therefore, as she reaches the traffic signal when it turns green, her speed is 0 m/s.

Explanation:

This situation can be approached using the concept of kinematics in Physics. To solve it, we need to consider total time and total distance traveled. The motorist is driving towards the traffic light, which is 200m away, and the light stays green for 15 seconds. However, since it takes her 1 second to step on the brakes, effectively, she has 14 seconds to travel to the light.

Since she starts braking the car, she begins to decelerate. While decelerating, time is the only determinant of the distance covered, not the speed. As she reaches the light, the speed would be zero regardless of the initial speed or distance if the deceleration is constant. So, when the light turns green, her speed will be 0 m/s.