PHYSICS HIGH SCHOOL

Which type of thermal energy transfer does a wrapping of cotton or plastic reduce the most? O A. Radiation O B. Conduction O C. Convection O D. Translation

Answers

Answer 1

Answer:

Answer:

RADIATION

Explanation:

JUST TOOK IT ON APEX

Answer 2

Answer:

Answer: Translation

Explanation:

Apex

Thanks

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The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, the gravitational force would become: Option a) F/4 Option b) F/2 Option c) 2F Option d) F^2

Answers

Answer:F/4

Explanation:

F1=G M1M2/R^2

F2=G M1M2/4R^2 (1/2*1/2)

F1/F2=G M1M2/R^2 *G M1M2/4R^2

NOW everything gets canceled and we are left with-

F1/F2=4

F1/4=F2

so Option a is right.

[01.02]The captain told the passengers that the plane is flying at 450 miles per hour. This information describes the plane's

1 velocity.
2 speed.
3 acceleration.
4 direction.

Answers

Answer : speed

Explanation :

Speed is defined as the distance travelled per unit time. It is a scalar quantity.

Velocity is displacement covered per unit time. It is a vector quantity. This means it have both magnitude as well as direction.

When captain told the passengers that the plane is flying at 450 miles per hour, then this shows the speed of plane. He is not talking about the direction in which the plane is flying.

So, this information describes the speed of plane.

Correct option is (2).

That information describes the plane's speed.
If he had also told them what direction they were flying, then
they would have been able to put the two pieces of information
together, and they would know the plane's velocity.

You have a cylindrical balloonship with the mass of 25 000kg, how should I calculate the airfriction on it's speed?

Answers

That is some advanced aerodynamics you have there.

You'll need to know at least the dimensions of the whole ship, and
the coefficient of friction between air and whatever material the bag
is made of. I don't think the total mass is going to be too important.

Approximately, how far is the earth from the Sun? 15,000 km 150,000 km 150,000,000 km 150,000,000,000 km

Answers

Answer: Earth is around 150,000,000 km far from the Sun.

Explanation:

Earth is the third planet in Our Solar System which revolves around the Sun.

The distance of Earth from Sun is 149.6 million kilometers which can be approximated to 150 million km.

Using the conversion factor:

$\text{1 million km}=10^6km$

Now, converting 150 million km to kilometers, we get:

$\text{150 million km}=150*n 10^6km=150,000,000km$

Hence, Earth is around 150,000,000 km far from the Sun.

the earth is approximately 150,000,000 km away from the sun

(a) What is the magnitude of the tangential acceleration of a bug on the rim of a 12.5-in.-diameter disk if the disk accelerates uniformly from rest to an angular speed of 75.0 rev/min in 3.80 s