PHYSICS HIGH SCHOOL

Which of the following is an example of a measurement of velocity?a. 1 m
b. 1 m/s
c. 1 m/s²
d. 1 m/s north

Answers

Answer 1
Answer:  velocity is magnitude and direction. its unit is meter per second

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on a small planet, an astronaut uses a vertical force of 175 newton to lift an 87.5 kg boulder at constant velocity to height of 0.350 meter above the planet's surface. What is the magnitude of the gravitation field strenght on the surface of the planet

Answers


                                                         Weight =  (mass)  x  (gravity)

                                                          175 N  =  (87.5 kg) x (gravity)

Divide each side by  87.5 kg :      Gravity = (175 N) / (87.5 kg)

                                                                      =  2 m/s²

We don't care how far he lifted it.

A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

Answers

Answer: The kinetic energy of the ball at the maximum height is zero.

Explanation -

As per the question, the ball is moving vertically upwards. Every time it's velocity will decrease and it becomes zero at the maximum height.


Whole of ball's initial kinetic energy is converted into potential energy at maximum height.


Thus we can conclude that the kinetic energy is zero at the maximum height.

The maximum height is the point where the ball runs out of gas,
stops rising, starts falling, and it's velocity changes from upward
to downward.  At that instant, it has no speed, so its kinetic energy
is zero.

Table salt is blank mixed with other compunds

Answers

sodium mixed with chloride 

The kinetic energy of the diver is 5040 J. The speed of the diver is 12 m/s. Calculate the mass of the diver.What's the mass of the diver?​

Answers

Answer:

  • 70 kg

Explanation:

We know that,

  • Kinetic energy = 1/2 mv²

Where m is mass and v is velocity or speed.

Putting the required values,

  • 5040 = 1/2 × m ( 12 × 12)
  • 5040 × 2 = m × 144
  • 10080 = m × 144

divide both side by 144

  • m = 70 kg

So the mass of the diver is 70 kg respectively.

Atomic mass unit

a standard unit of mass used for _____ particies

Answers

Answer:

Atomic particle.

Explanation:

It is used to calculate mass at atom level .

1 amu is the mass of 1 atom of C12 carbon

Which formula correctly shows how to calculat the time taken, given the average velocity and the displacement

Answers

We're so good here on Brainly, we can answer it
even WITHOUT seeing the choices.

     Time = (displacement) / (magnitude of average velocity) .
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