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3 years ago

What are at least 3 examples of sublimation?

Physics

2 answers:

Step2247 [10]3 years ago

5 0

Answer:

dry ice, air fresheners, polar evaporation, arsenic treatment

barxatty [35]3 years ago

3 0

Dry ice, ice crystals inside boxes of frozen food, snow under certain conditions, iodine crystals, Arsenic, bathroom fresheners,

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In which direction does centripetal force act on an object? in the opposite direction of the tangential speed of the object in t

RideAnS [48]

Answer:

towards the center of the circle

(which appears to be the last option in your list of possible answers)

Explanation:

The centripetal force points always towards the center of the circle described by the object moving.

5 0

4 years ago

The floor of a railroad flatcar is loaded with loose crates having a coefficient of static friction of 0.480 with the floor. If

elena-14-01-66 [18.8K]

Answer:30.50 m

Explanation:

Given

coefficient of friction between railroad and crates $\mu =0.48$

Train initial velocity (u) $=61 kmph \approx 16.94 m/s$

To get the shortest distance brakes applied should be order of friction force between crates and railroad floor

$a=\mu g=0.48\times 9.8=4.704 m/s^2$

using $v^2-u^2=2as$

where v=final velocity

u=initial velocity

a=acceleration or deceleration

s=distance

here v=0 , u=16.94 m/s

$0-(16.94)^2=2\times (-4.704)\times s$

$s=\frac{(16.94)^2}{2\times 4.704}$

s=30.502 m

7 0

4 years ago

2. A tiny pig is dropped from the top of a building and lands safely on a trampoline. The tiny pig will have

allsm [11]

Answer:

c. Kinetic energy

Explanation:

The two types of energy involved in this problem are:

- Potential energy: it is the energy possessed by an object due to its position. It is calculated as

$PE=mgh$

where

m is the mass of the object

g is the acceleration due to gravity

h is the height of the object relative to the ground

From the formula, we see that the higher the object is above the ground (higher h), the larger the potential energy of the object. In this problem, the pig is falling down, so the value of h is decreasing, therefore the potential energy is decreasing as well.

- Kinetic energy: it is the energy possessed by an object due to its motion. It is given by:

$KE=\frac{1}{2}mv^2$

where

m is the mass of the object

v is its speed

In this problem, as the pig falls down, it accelerates, so its speed increases: since the kinetic energy is proportional to the square of the speed, as the speed increases, its kinetic energy increases too. So, the correct answer is

c. Kinetic energy

4 0

4 years ago

The cornea of the eye has a radius of curvature of approximately 0.40 cm , and the aqueous humor behind it has an index of refra

My name is Ann [436]

Answer:

0.64814 cm

Explanation:

$n_1$ = Refractive index of air = 1

$n_2$ = Refractive index of aqueous humor = 1.35

u = Object distance = $\infty$

v = Image distance = 25 mm

R = Radius of curvature of the cornea

Lens equation

$\dfrac{n_2-n_1}{R}=\dfrac{n_1}{u}+\dfrac{n_2}{v}\\\Rightarrow \dfrac{1.35-1}{R}=\dfrac{1}{\infty}+\dfrac{1.35}{2.5}\\\Rightarrow \dfrac{1.35-1}{R}=\dfrac{1.35}{2.5}\\\Rightarrow \dfrac{0.35}{R}=\dfrac{1.35}{2.5}\\\Rightarrow R=\dfrac{0.35\times 2.5}{1.35}\\\Rightarrow R=0.64814\ cm$

Radius of curvature of the cornea is 0.64814 cm

5 0

4 years ago

A scuba diver shines a flashlight from beneath the surface of water (n = 1.33 such that the light strikes the water-air boundary

Len [333]

The beam is refracted at 53.17-degree angle (asin 0.800414 = 53.17-degree). This problem can be solved by using the Snell's Law which described the refracted beam angle which traveled through a different media, in this case, through water and air. The formula of Snell's Law is stated as n1 sin θ1= n2 sin θ2. In this formula n1 is the refraction index of medium 1, θ1 is the normal light angle in the medium 1, n2 is the refraction index of medium 2, and θ2 is the normal light angle in the medium 2<span>. </span>

7 0

3 years ago