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3 years ago

Which two surfaces have the lowest coefficient of friction

Physics

1 answer:

jok3333 [9.3K]3 years ago

5 0

Answer:

Explanation:

As an example, ice on steel has a low coefficient of friction – the two materials slide past each other easily – while rubber on pavement has a high coefficient of friction – the materials do not slide past each other easily. The coefficients of friction ranges from near 0 to greater than 1.

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A car starts from rest with an acceleration of 2.84 m/s2 at the instant when a second car moving with a velocity of 25.7 m/s pas

vredina [299]

Answer:

464.69 m

Explanation:

First car

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=0\times t+\frac{1}{2}2.84t^2\\\Rightarrow s=1.42t^2$

Second car

Distance = Speed × Time

$\text{Distance}=25.7t$

Here, the time taken and the distance traveled will be the same

Equating the two equations

$1.42t^2=25.7t\\\Rightarrow t=\frac{25.7}{1.42}\\\Rightarrow t=18.09\ s$

So, the first would have to move $1.42t^2=1.42\times 18.09^2=464.69\ m$ in order to overtake the second car.

7 0

4 years ago

A housekeeper is cleaning the kitchen and decides to to use a ladder to reach a top shelf. As he/she is cleaning he/she is start

pshichka [43]

The amount of gravitational force between both objects will be the same.

The magnitude of the Earth's gravitational force exerted on the housekeeper is calculated by applying Newton's second law of motion;

F = mg

where;

m is the mass of the housekeeper

g is acceleration due to gravity

According to Newton's third law of motion, action and reaction are equal and opposite.

The force exerted on the housekeeper by the Earth is equal in magnitude to the force exerted on the Earth by the housekeeper.

$F_{H} = - F_{E}$

The two forces are equal in magnitude but opposite in direction.

Thus, the correct option is " the amount of gravitational force between both objects will be the same"

The missing part of the question is below:

a. the Earth exerts the largest amount of gravitational force

b. the housekeeper exerts the largest amount of gravitational force

c. the amount of gravitational force between both objects will be the same

Learn more about Newton's third law of motion here: brainly.com/question/15507

3 0

2 years ago

A monochromatic red laser beam emitting 1 mW at a wavelength of 638 nm is incident on a silicon solar cell. Find the following:

tia_tia [17]

Answer:

Explanation:

First we calculate the energy of the photon

E=(Planck constant × speed of light in vacuum)÷ wave length

E= $\frac{6.626*10^{34}*2.998*10^{8} }{638*10^{-9} } = 3.114*10^{49}$

Next we find the total energy per second

total energy= $1*10^{-3}W *\frac{1JS^{-1} }{1W} = 1*10^{-3} JS^{-1}$

Next we calculate the number the photon per second

= total energy ÷ energy of 1 photon

= $\frac{1*10^{-3} JS^{-1} }{3.114*10^{49} } = 3.21*10^{-53} \ photons/sec$

8 0

3 years ago

What has to be true about mass if a small object (like a metal ball) has a high density? A: The mass has to be high compared to

inysia [295]

Since density is equal to mass divided by volume, we can determine the relationship between mass, density, and volume. Therefore, we can automatically know that the answer must either be A or B, since this information is determinable. The prompt lists the object as small. Therefore, we know that density is high, but volume is low. Let's examine the equation (D = M/V), where d = density, m = mass, and v = volume. In order for any number to be divided by a smaller number and have the end result be a higher number, the numerator (i.e. mass) must be bigger than the denominator (i.e. volume). We can also see that this is true by substituting in somewhat random numbers for d, m, and v. D = M / V 5 = 10 / 2 10 > 2 M > V In conclusion, your answer is D.

6 0

3 years ago

Read 2 more answers

The volume V of a python egg is given by the formula V=43πabc. For some python eggs, a=2a=2 inches, b=2b=2 inches, and c=3c=3 in

NARA [144]

Answer:

V=516πin^2

Explanation:

you must replace a, b, and c in the first formula for the python egg

a=2inches

b=2inches

c=3inches

REPLACING IN THE ORIGINAL EQUATION

V=43πabc

V=43π(2)(2)(3)

V=43(12)π

V=516πin^2

The volume of the piton egg is 516π in^2

4 0

3 years ago