PHYSICS HIGH SCHOOL

A tortoise is walking in the desert. It walks6.4 meters in
4 minutes. What is its speed?

Answers

Answer 1
Answer:
It's speed is exactly 6.4 meters per 4 minutes.

In the more familiar units, that's

       (6.4 m / 4 min) = 1.6 meters per minute

(1.6 m / min) (100 cm/m) ( 1 min / 60 sec)  =  2-2/3 cm per sec.

                                                                       (1.05 inch per second, rounded)

                                                                       (160.3 furlongs per fortnight, rounded)
Answer 2
Answer:

The speed of the tortoise can be calculate as follows:

v=(S)/(t)

where

S is the distance travelled by the tortoise

t is the time taken


In this problem, S=6.4 m, while we should convert the time into seconds:

t=4 min= 4\cdot 60 =240 s


Substituting the numbers into the equation, we find the speed:

v=(S)/(t)=(6.4 m)/(240 s)=0.027 m/s

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Calculate the man’s mass. (Use PE = m × g × h, where g = 9.8 N/kg.)A man climbs a wall that has a height of 8.4 meters and gains a potential energy of 4,620 joules. His mass is about
kilograms

Answers

Answer:

mass=56.12kg

Explanation:

PE=mgh

4620=m×9.8×8.4

make msubject of the formula...

m =4620/(9.8×8.4)

m=4620/82.32

m=56.12kg

A wave a strong undertow. What kind of wave is it

Answers

Hey there! 

Answer: A swell

A wave which creates a strong undertow is called a swell. These types of waves are also known as surface gravity waves. 

Thank you!

Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following situation?Heat traveling through the ceiling from your bedroom to the attic.
A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.
B) Warm air rising in a room where the air is moving.
C) The sun warming up the roof on a house.
D) Cold water sinking in a pot of water being warmed up on the stove.

Answers


The situation (heat going through the ceiling) describes
conduction ... heat going from one place to another by
soaking through some material.

A).  This is the one.  Heat goes from from the marshmallow
to your hand by soaking through the wire.   This is conduction too.

B).  No.  The heat in the room goes from the floor to the ceiling
because the warm air rises and carries it there.  This is convection.

C).  No.  There's nothing for the heat to soak through between
the sun and the roof, and nothing that can move from the sun
to the roof and bring the heat with it.  This is radiation.

D).  No.  Cold water sinks from the surface to the bottom because
warm water rose from the bottom to the surface, taking heat with it. 
This is convection.

The answer is


A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.


HOPE I HELPED (:

How should you test a hypothesis?

Answers

The only way you can test a hypothesis is when you done your experiment or whatever you're doing, then you look back to your hypothesis statement then you see if you're right or wrong!

A diver shines light up to the surface of a smooth pond at a 10 degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of __________. A) less than 10 degrees. B) 10 degrees. C) more than 10 degrees.

Answers

When light passes from one medium (water in this case) into another medium with a different refractive index (air), it follows the law of reflection and refraction.

The law of reflection states that the angle of incidence (the angle at which the light enters the second medium) is equal to the angle of reflection (the angle at which the light reflects back into the first medium), both measured with respect to the normal (a line perpendicular to the surface).

In this scenario, the diver shines light into the pond at a 10-degree angle to the normal. When the light reaches the air-water interface, some of it reflects back into the water. According to the law of reflection, the angle of reflection will be equal to the angle of incidence.

So, the correct answer is:

B) 10 degrees.

The angle at which the light reflects back into the water is 10 degrees, the same as the angle of incidence.

What is required to cause acceleration?

Answers

F = ma

Where m = mass of body,  a = acceleration.

F = ma = m(v - u)/t

So for an acceleration to occur, a force is required.

Also a change of velocity is required for acceleration to occur.
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