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3 years ago

What is constant velocity in comparison to instantaneous velocity?

Physics

1 answer:

sergij07 [2.7K]3 years ago

8 0

Answer:

Please find the answer in the explanation

Explanation:

Constant velocity is the uniform velocity. That is, the velocity is steady and it does not change. You will have a constant velocity when you maintain a certain velocity for a long time without changing it.

At constant velocity, acceleration is equal to zero.

Instantaneous velocity is the change in distance in a specific direction per specific time. It is a velocity at a certain time. It is not uniform.

Change in instantaneous velocity is equal to acceleration.

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Polonium, the Period 6 member of Group 6A(16), is a rare radioactive metal that is the only element with a crystal structure bas

Burka [1]

Answer:

Approximate atomic radius for polonium-209 is 167.5 pm .

Explanation:

Number of atom in simple cubic unit cell = Z = 1

Density of platinum = $9.232 g/cm^3$

Edge length of cubic unit cell= a = ?

Atomic mass of Po (M) = 209 g/mol

Formula used :

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

ρ = density

Z = number of atom in unit cell

M = atomic mass

$(N_{A})$ = Avogadro's number

a = edge length of unit cell

On substituting all the given values , we will get the value of 'a'.

$9.232 g/cm3=\frac{1 \times 209 g/mol}{6.022\times 10^{23} mol^{-1}\times (a)^{3}}$

$a = 3.35\times 10^{-8} cm$

Atomic radius of the polonium in unit cell = r

r = 0.5a

$r=0.5\times 3.35\times 10^{-8} cm=1.675\times 10^{-8} cm$

$1 cm = 10^{10} pm$

$1.675\times 10^{-8} cm=1.675\times 10^{-8}\times 10^{10}=167.5 pm$

Approximate atomic radius for polonium-209 is 167.5 pm.

7 0

3 years ago

After a traffic light turns green, a car is observed to accelerate from rest for 6.0 seconds. If the speed limit on that stretch

nataly862011 [7]

congratulations oh feedcounsel Ozark Ozark

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3 years ago

The same car now travels on a straight track and goes over a hill with radius 101 m at the top. What is the maximum speed that t

denis-greek [22]

Answer:

The maximum speed of the car is 31.46 m/s.

Explanation:

Given that,

Radius = 101 m

We need to calculate the maximum speed that the car can go over the hill without leaving the road

Using relation of normal force and centripetal force

$\dfrac{mv^2}{r}=mg$

Where, m = mass of car

$v=\sqrt{rg}$

Put the value into the formula

$v=\sqrt{101\times9.8}$

$v=31.46\ m/s$

Hence, The maximum speed of the car is 31.46 m/s.

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3 years ago

(100 POINTS!!!!!) What type of solar radiation does not reach the surface of the Earth?

Kobotan [32]

Gamma radiations do not reach the surface of the Earth

Explanation:

Sun radiates all of these radiations but one of them does not reach the surface of the Earth. Most of the radiation switch reaching the Earth's surface are visible and infrared radiations.

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3 years ago

A man in a boat is lookinh dtraight down at a fish in the water (n = 1.333) directly beneath him. The fish is looking straight u

maria [59]

Answer:

To the fish the man appears to be 3.06m above its eyes

Explanation:

We know that refractive index n

n = real dept/ apparent depth

While apparent depth is the distance the fish appears to the man which is 2.3m so using the equation

Real dept= n x apparent depth

= 1.333* 2.3= 3.06m

8 0

3 years ago