How is it technically correct to say that a car making a u-turn can have a constant speed but cannot have a constant velocity?

1 answer:

5 0

During the "U" part of the turn, the car would follow an approximately circular path, and if it's moving at a constant speed, it would have to accelerate toward the center of the circle in order to change its direction.

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When a substance experiences a phase change (state of matter change) is this a chemical or physical change? How do you know?

makkiz [27]

Answer:its a physical change as state of matter changes without any reactions

Explanation:when a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring

4 0

3 years ago

Use the concept of fields to describe how forces can act from a distance.

Leni [432]

The strength of a field force changes with distance from the sourceof the field-stronger closer to the source, weaker farther away from the source. The source can be either a mass, a charged particle, or a magnetic pole.

8 0

3 years ago

If two protons and two neutrons are removed from the nucleus of an oxygen atom, a nucleus of which element remains?

trapecia [35]

Answer:

Carbon 12

Explanation:

I don't 100% know what to put here, but...

When you remove the nucleus from an oxygen atom, almost everything of the base oxygen is essentially stripped away. Since almost everything is made of carbon, and Carbon 12 is one of the most common forms of Carbon, Carbon 12 would be what is left.

5 0

3 years ago

A rescue airplane is diving at an angle of 37o below the horizontal with a speed of 250 m/s. It releases a survival package when

igomit [66]

Answer:

796.2 m.

Explanation:

A sketch of the given question forms a right angled triangle with two given sides and a non included angle. Applying the appropriate trigonometric function, we have;

Tan θ = $\frac{opposite}{adjacent}$

Let the horizontal distance required be represented by x, so that;

Tan $37^{o}$ = $\frac{600}{x}$

0.7536 = $\frac{600}{x}$

⇒ x = $\frac{600}{0.7536}$

= 796.1783

x = 796.2 m

Thus, the horizontal distance of the point of impact is 796.2 m.

5 0

2 years ago

The c-cl bond dissociation energy in cf3cl is 339 kj/mol. What is the maximum wavelength of photons that can rupture this bond?

ruslelena [56]

Answer:

3.53*10^{-7} m

Explanation:

Photon that can rupture the bonds are those with the energy of the bond dissociation energy. If we want to know the energy for each molecule we have to take into account that:

$1mol=6.022*10^{23}molecule$