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4 years ago

What is the definition of speed

Physics

2 answers:

lana [24]4 years ago

4 0

The rate at which someone or something can move or operate very fast.

Brums [2.3K]4 years ago

4 0

A rate that someone or something is able to move or operate.

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I need help idk if it’s C or D?

alex41 [277]

I think the answer is D.

6 0

3 years ago

A 30 kg box sits on the floor it requires 275N of force to get it moving once it is moving it only takes 225N of force.what are

gavmur [86]

1) The coefficient of static friction is 0.935

2) The coefficient of kinetic friction is 0.765

Explanation:

When a force is applied on a box sitting on the floor, the force that must be applied in order to make the box moving is equal to the maximum force of static friction between the floor and the box, which is:

$F = \mu_s mg$

where

$\mu_s$ is the coefficient of static friction

m is the mass of the box

g is the acceleration of gravity

Here we have:

m = 30 kg

$g=9.8 m/s^2$

F = 275 N

Therefore, the coefficient of static friction is

$\mu_s = \frac{F}{mg}=\frac{275}{(30)(9.8)}=0.935$

Once the box is in motion, the force that must be applied in order to make the box moving at constant velocity is equal to the force of kinetic friction between the floor and the box, which is:

$F = \mu_k mg$

where

$\mu_k$ is the coefficient of kinetic friction

m is the mass of the box

g is the acceleration of gravity

Here we have:

m = 30 kg

$g=9.8 m/s^2$

F = 225 N

Therefore, the coefficient of kinetic friction is

$\mu_k = \frac{F}{mg}=\frac{225}{(30)(9.8)}=0.765$

Learn more about friction:

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#LearnwithBrainly

8 0

3 years ago

An incident ray strikes a piece of diamond at an angle of 40.5 degrees. The index of refraction of air is 1.0003 and the index o

horrorfan [7]

The angle of refraction is 15.6 deg.

When a ray of light passes from medium 1 to medium 2, the refractive index of medium 2 with respect to 1 is the ratio of the absolute refractive index of medium 2 and medium 1

$_1n_2 =\frac{n_2}{n_1}$

When light passes from air into diamond, with the given values of refractive indices,

$_an_d =\frac{n_d}{n_a} =\frac{2.42}{1.0003} =2.4193$

According to Snell's law,

$_an_d=\frac{sini}{sinr} \\ sinr=\frac{sini}{_an_d} =\frac{sin(40.5)}{2.4193}=0.2684\\ r=arcsin(0.2684)=15.57 deg$

The angle of refraction is 15.6 deg

7 0

4 years ago

Read 2 more answers

Which substance is a combination of different atoms?

inysia [295]

<span>A pure substance is an element or compound. If it's an element, then it's made of only one kind of atom. If it's a compound, then it's made of only one kind of formula unit. For example, hydrogen (H2) and oxygen (O2) are elements. In pure samples of H2 and O2, you find only one kind of element. H2O is a compound, water. In pure samples of H2O, you find only formula units of H2O (called molecules because H2O is covalent). Neither the components that make up H and O atoms, nor the atoms that make up H2O can be separated by physical means. H2, O2, and H2O are all considered substances. </span>

5 0

3 years ago

Read 2 more answers

6. A car accelerates from rest to 5m/s in 20 s. The force from the engine is 2000N. The force of air resistance and friction act

otez555 [7]

Answer:

net force= 2000-1000=1000

a=v-u/t=5/20=1/4

m=?

m=f/a

=1000÷1/4=4000kg

4 0

3 years ago