PHYSICS HIGH SCHOOL

Calculate surface tension of an enlarged radius of 4cm to 6cm and amount of work necessary for enlargement was 1.5×10^-4 joules

Answers

Answer 1

Answer:

$T=7.5*10^(-5)$

Explanation:

From the question we are told that:

Radius $r=2cm$

Work done $W=1.5×10^-4 joules$

Generally the equation for Work done is mathematically given by

$W=T.dA$

Therefore

$T=(W)/(dr)$

$T=(1.5*10^(-4))/(2)$

$T=7.5*10^(-5)$

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Most of the stars in the Milky Way will end their lives as

Answers

Most of the stars in the Milky Way will end their lives as white dwarfs

Most of the stars in the Milky Way will end their lives as white dwarfs.

If you are in a spaceship that is sitting on the surface of a planet, you feel your weight. How does this compare to the weight you feel in an accelerating spacecraft?

Answers

Answer:

You will feel more weight if it is accelerating out of the planet.

You will feel less weight if it is accelerating towards the planet.

Explanation:

The weight that you are observing or feeling is basically due to the change in acceleration of your fall or rising up in the spaceship. When the acceleration is stationary on the surface, you experience your normal weight due to the gravitational acceleration of that planet.

When the spaceship accelerates above or out of the planet you experience acceleration more than the acceleration of gravity hence more weight.

When the spaceship accelerates towards the planet you experience acceleration less than the acceleration of gravity hence less weight.

If the spaceship is free falling at the gravitational acceleration you experience a zero weight

What is the process of preparing a person to perform strenuous work and to recover from that work as quickly as possible?

Answers

The process of preparing a person to perform strenuous work and to recover from that work as quickly as possible is called training, I bet. Such warm up exercises as like stretching and other should lead person to the recovery. Hope it will help.

Air is a good conductor of heat. Please select the best answer from the choices provideda. True
b. False

Answers

the answer would be true because air can be heated easily

A 60-kg person is traveling in a car moving at 16 m/s, when the car hits a barrier. The person is not wearing a seat belt, but is stopped by an air bag in a time interval of 0.20 s. Determine the average force that the air bag exerts on the person?

Answers

Using conservation of momentum, we can solve for the force that the air bag exerts on the person.

Recall the equation for momentum (p):

$p = mv = F*dt$

We can solve for total momentum, then divide by out time interval. This gets us:

$(60kg)(16m/s) = F(0.2s)F = 4800N$

F = 4800N

At which point on this electric field will a test charge show the maximum strength?A
B
C
D

Answers

Answer:

Explanation:

The figure shows the electric field produced by a spherical charge distribution - this is a radial field, whose strength decreases as the inverse of the square of the distance from the centre of the charge:

$E\propto (1)/(r^2)$

More precisely, the strength of the field at a distance r from the centre of the sphere is

$E=k(Q)/(r^2)$

where k is the Coulomb's constant and Q is the charge on the sphere.

From the equation, we see that the field strength decreases as we move away from the sphere: therefore, the strength is maximum for the point closest to the sphere, which is point A.

This can also be seen from the density of field lines: in fact, the closer the field lines, the stronger the field. Point A is the point where the lines have highest density, therefore it is also the point where the field is strongest.

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Manuel releases a pendulum bob. The drawing shows its path. At which point does the pendulum bob have the most gravitational potential energy? a. no differences b. point D c. point B d. point C

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