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3 years ago

What force must be overcome to set an object in motion

Physics

2 answers:

forsale [732]3 years ago

8 0

Newtons Law of motion
HOPE IT HELPS:)

podryga [215]3 years ago

7 0

Friction must be overcome

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A student wants to draw a model of an atom. Which statement describes how to find the number of neutrons to include in the model

katrin2010 [14]

Answer:

The number of electrons is not important (eliminate B and C)

The mass number is equal to or greater than the atomic number

(this leaves only D)

Mass number is the total mass of the nucleus (neutrons + protons)

Subtracting the atomic number from the mass number gives:

Mass number - Atomic number = number of neutrons

3 0

2 years ago

An astronaut landed on a far away planet that has a sea of water. To determine the gravitational acceleration on the planet's su

TiliK225 [7]

The concept required to solve this problem is hydrostatic pressure. From the theory and assuming that the density of water on that planet is equal to that of the earth $(1000kg / m ^ 3)$ we can mathematically define the pressure as

$P = \rho g h$

Where,

$\rho$ = Density

h = Height

g = Gravitational acceleration

Rearranging the equation based on gravity

$g = \frac{P_h}{\rho h}$

The mathematical problem gives us values such as:

$P = 2.4 atm (\frac{101325Pa}{1atm}) = 243180Pa$

$\rho = 1000kg/m^3$

$h = 28.6m$

Replacing we have,

$g = \frac{243180}{(1000)(28.6)}$

$g = 8.5m/s^2$

Therefore the gravitational acceleration on the planet's surface is $8.5m/s^2$

3 0

2 years ago

A group of 25 particles have the following speeds:

svp [43]

Answer:

Part a: The average speed is 24.12 m/s

Part b: The rms speed is 25.55 m/s

Part c: The most probable speed is 17 m/s.

Explanation:

Part a

Average Speed

<em>Average speed is given as </em>

<em /> $v_{avg}=\frac{\sum}{n}$

$v_{avg}=\frac{(2 \times 11) +(7 \times 17)+(4 \times 19)+(3 \times 27) +(6 \times 32) +(1 \times 33)+(2 \times 40) }{25}\\v_{avg}=\frac{22+119+76+81+192+33+80}{25}\\v_{avg}=\frac{603}{25}\\v_{avg}=24.12 m/s$

So the average speed is 24.12 m/s

Part b

RMS Speed

$v_{rms}=\frac{\sum v^2}{n}$

$v_{rms}=\sqrt{\frac{(2 \times 11^2) +(7 \times 17^2)+(4 \times 19^2)+(3 \times 27^2) +(6 \times 32^2) +(1 \times 33^2)+(2 \times 40^2) }{25}} \\v_{rms}=\sqrt{\frac{242+2023+1444+2187+6144+1089+3200}{25}}\\\\v_{rms}=\sqrt{\frac{16329}{25}}\\v_{rms}=\sqrt{653.16}\\v_{rms}=25.55 m/s$

So the rms speed is 25.55 m/s

Part c

Most Probable Speed

As 7 particles have speed of 17 m/s i.e. 7 is the highest frequency so 17 m/s is the most probable speed.

3 0

2 years ago

When the motion of one or both of the particles is at an angle to the line of impact, the impact is said to be ________

Nana76 [90]

Answer: Oblique impact

Explanation:

When the motion of one or both of the particles is at an angle to the line of impact, the impact is said to be oblique impact.

On the other hand, when the directions of motion of the two colliding particles are moving along a line of impact, then it's refered to as central impact.

7 0

2 years ago

_______is a speed in a certain direction.

Law Incorporation [45]

D. velocity
Velocity depends on speed and direction

6 0

2 years ago