PHYSICS HIGH SCHOOL

a boy runs from his house to school at speed 5m/s on a straight road and returns with speed of 10m/s.The distance between the house and school is 100m. Find his average velocity.... with explaination please

Answers

Answer 1

Answer:

Explanation:

time spent to run from house to school=100/5=20s

time spent to return from school=100/10=10s

average velocity=200m/(10+20)

=6.66m/s

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As a diligent physics student, you carry out physics experiments at every opportunity. At this opportunity, you carry a 1.05 m 1.05 m long rod as you jog at 3.27 m/s 3.27 m/s , holding the rod perpendicular to your direction of motion. What is the strength of the magnetic field that is perpendicular to both the rod and your direction of motion and that induces an EMF of 0.275 mV 0.275 mV across the rod? Express the answer in milliteslas.

Answers

Answer:

The strength of the magnetic field is 0.08 mT

Explanation:

Given:

Length of rod $l = 1.05$ m

Velocity of rod $v = 3.27$ $(m)/(s)$

Induced emf $\epsilon = 0.275 * 10^(-3)$ V

According to the faraday's law

We know that the induced emf of rod is given by,

$\epsilon = Blv$

Where $B =$ magnetic field

For finding the magnetic field,

$B = (\epsilon )/(lv)$

$B = (0.275 * 10^(-3) )/(1.05 * 3.27)$

$B = 0.08 * 10^(-3)$

$B = 0.08$ mT

Therefore, the strength of the magnetic field is 0.08 mT

A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees kelvin. When the temperature of the gas is raised to 533 degrees kelvin, what is the new volume of the gas? (Assume that there's no change in pressure.) A. 0.0006 m3
B. 0.2333 m3
C. 0.2146 m3
D. 0.3198 m3

Answers

pV = n R T => if pressure is constant => p = n R T / V = const. => p / n R = T/ V = const. => T / V = const. T1 = 333 K T2 = 533 K V1 = 0.2 m3
T1 / V1 = T2 / V2 => V2 = V1 x T2 / V2 = 0.2 x 533 / 333 = 0.32 m^3 answer D is correct

how far can a person run in 15 minutes if he or she runs a at an average speed of 16 km/hr? what is the runners distance traveled in miles

Answers

To find this, we would divide 60 by 15 because there is 60 minutes in an hour and we're trying to find how much of 16 km he can run in 15 minutes. When we divide 60 by 15 we get 4. Now we divide 16 by 4 to get 4. So he can run 4 km in 15 minutes.

Answer:

2.5

Explanation:

2 examples of all 7 wave behaviors

Answers

Answer:

radio waves

microwaves

All waves behave in certain characteristic ways. They can undergo refraction, reflection, interference and diffraction.

Name the scientist that showed copernicus's theory of a moving earth reasonable?

Answers

The name of the Scientist that showed Copernicus theory of a moving earth reasonable was Galileo. Hope this helps you.

The scientist was Galileo Galelei

How can a protein outside the cell cause events to happen inside the cell?

Answers

Answer:

Explained

Explanation:

The proteins(sometimes are called celluar ligands) outside the cell can bind to a receptor protein( generally found on the cell membranes) on the cell surface, causing it( receptor protein) to change the shape and sending a signal inside the cell.

Final answer:

A protein exterior to a cell can influence intracellular processes through receptors on the cell's surface. This change can affect DNA transcription, regulate cell cycle, or stimulate cell death. Malfunctions in these proteins can lead to health issues like cancer, asthma, and hypertension.

Explanation:

A protein outside the cell can cause events to happen inside the cell with the help of the protein receptors on the cell's plasma membrane. When a molecule binds to the receptor on the cell's surface, it triggers a change in the receptor's structure. This change then affects the microfilaments inside the cell, which in turn initiates a series of chemical signals inside the cell affecting the transcription of DNA. This process can regulate activities such as the cell cycle or initiate cell death, also known as apoptosis, under certain conditions.

For example, external events such as cellular crowding or hormonal changes can influence cell division. Another example can be seen in T-cells. They target foreign cells for destruction by the immune system. If these T-cells accidentally target the cells of their own organism, this can lead to autoimmune diseases. In such cases, the T-cell binds to the 'self' proteins which triggers apoptosis to remove the harmful cell.

Errors in the structure of these receptor proteins can lead to various health issues like hypertension, asthma, heart disease, and cancer.