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3 years ago

Is the strange solid/liquid changing behavior of Oobleck the SAME as an ice cube melting?

1 answer:

6 0

I don’t think so because an ice cube melting needs heat and relies on temp while ooblecks transition from solid to quickly depends on force and speed

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The diameter of a hydrogen atom is 0.000000000106 m. How can this

Andreas93 [3]

Answer:

The diameter of a hydrogen atom based on scientific notation is 1.06 x 10^-10 m

8 0

3 years ago

This particle is found in the nucleus and adds mass to the nucleus, but changing its number does not change what the element is.

Sliva [168]

Adding neutron to the nucleus creates new isotopes of that element. Mass of the nucleus will increase if you add neutron to it but element will remain the same. If you add proton to the nucleus, mass of the nucleus will change but also element will also change. That is, atom of the element will change.

5 0

3 years ago

What is a characteristic of atoms

Vilka [71]

Answer:

Atoms cannot be divided using chemicals. They do consist of parts, which include protons, neutrons,...

Each electron has a negative electrical charge.

Each proton has a positive electrical charge.

Each neutron is electrically neutral. In other words, neutrons do not have a charge

Explanation:

8 0

3 years ago

Review Conceptual Example 16 as background for this problem. The water skier there has a mass of 73 kg. Find the magnitude of th

Slav-nsk [51]

Answer:

a) F = 100.375 N

b) F = 38.252 N

Explanation:

a) she is accelerated from rest to a speed of 11 m/s in 8.0 s

We get the acceleration we use this equation,

v = u + at

where v is the final velocity - 11 m/s

u = initial velocity = 0 m/s (from rest)

t is time taken = 8 s

Since v = u + at

11 = 0 + a×8

8a = 11

a = 11/8 = 1.375

a = 1.375 m/s²

The force equation is given by:

F = ma

F is the force, m is mass = 73 kg and a is acceleration

F = 73 × 1.375 = 100.375

F = 100.375 N

(b) she lets go of the tow rope and glides to a halt in 21 s.

We get the acceleration we use this equation,

v = u + at

where v is the final velocity = 0 m/s (to a halt)

u = initial velocity = 11 m/s

t is time taken = 21 s

Since v = u + at

0 = 11 + a×21

21a = -11

a = -11/21 = -0.524

a = 0.524 m/s²

The force equation is given by:

F = ma

F is the force, m is mass = 73 kg and a is acceleration

F = 73 × 0.524 = 38.252

F = 38.252 N

6 0

3 years ago

A weight lifter picks up a barbell and

kodGreya [7K]

Answer:

From highest to lowest: $W_1>W_2>W_3$

Explanation:

The work done by a force is given by

$W=Fd cos \theta$

where:

F is the force applied on the object

d is the displacement of the object

$\theta$ is the angle between the direction of the force and of the displacement

In case 1), the barbell is lifted upward. This means that:

- the force applied is upward

- the displacement of the object is upward

This means that $0$ , so the work done is positive: $W_1>0$

In case 2), the barbell is held stationary: this means that the displacement is zero,

$d=0$

And therefore, this means that the work done is also zero:

$W_2=0$

In case 3), the barbell is put down slowly, without dropping it. This means that:

- The force applied is still upward (in fact, the force applied must be upward in order to overcome the force of gravity downward, and avoid the barbell to fall down)

- The displacement of the barbell is downward

This means that $90^{\circ}$ , so $cos \theta$ , and therefore the work done is negative:

$W_3$

So the ranking from greatest to smallest work is

$W_1>W_2>W_3$

8 0

3 years ago