How do different cells in your body help you survive?

Answers

Answer 1

Answer: Different cells in our bodies perform different functions,hense they work together to make sure that the body functions well

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If two runners take the same amount of time to run a mile, they have the same __________.A.accelerationB.forceC.massD.velocity
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Choose the answer that explains the photoelectric effect.

Answers

Photoelectric effects occurs in metals. When light or electromagnetic radiation shines upon these metals, electrons jump or are emitted freely. These emitted electrons are therefore called photoelectrons. This phenomenon can be measured in electric currents. Photoelectric effect also denotes the wave-like property of light.

Answer:

Metallic plates emit electrons only when light of a certain minimum frequency shines on them.

Explanation:

Gravitational force decreases with distance. what does this mean for a space traveler who leaves earth in a spaceship?

Answers

This means that the farther away the astronaut is from the Earth, the less force gravity will be applying to his/her spacecraft. With this being said, once the astronaut breaks Earth's atmosphere, he can reduce the throttles a little to save on fuel, because he doesn't need all of that power to escape such a weak gravitational pull :D.

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.

Learn more about Deceleration here:

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How much will you pay for 5 pounds of shrimp if the cost is 2 pounds for $10.99?

Answers

10.99 = 2 pounds
10.99 / 2 = 5.495
5.495 x 5 = 27.475
= $27.48

I think that should be it

Anyone knows what this is?

Answers

I think it is D.) “Cycles around” but I am not positive.

What is the term used to describe the energy needed to get a reaction started

Answers

Activation Energy is the amount of energy needed to get a reaction started.

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Sunlight is a form of electromagnetic energy. a. True b. False

When light passes through an object unchanged scientists call that process

Which of the following is an acceptable description of the frequency of a transverse wave?