Nikki has a momentum of 45 Kilogram meters per second and a mass of 30 Kilograms. What is her velocity?

Which of these statements correctly describe the atom? Check all that apply. All matter on Earth is made up of atoms. The subato

Irina18 [472]

True: All matter on earth is made up of atoms.

False: Subatomic particles don't identify an element. I give you an electron. Can you tell me where it came from?

False: (1/2) A neutron has no charge [That's the True part]. It identifies the element. (Not true).

True: description of an electron.

True: description of a proton

3 0

3 years ago

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It requires a force of 100 N to stretch a spring of negligible mass by a distance of 0.1 m. If the spring instead stretches a di

Mariana [72]

by the formula of spring force we know that

$F = kx$

here we know that

$F = 100 N$

$x = 0.1 m$

now we will have

$100 = k \times 0.1$

$k = 1000 N/m$

now by similar way if the stretch in spring is 0.25 m

force is given by

$F = kx$

$F = 1000 \times 0.25$

$F = 250 N$

so it will require F = 250 N force

5 0

3 years ago

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Using the conservation of mechanical energy, calculate the final speed and the acceleration of a cylindrical object of mass M an

kati45 [8]

Answer:

speed is 4/3 × g × sin β

acceleration is g sin θ

Explanation:

Given data

mass = M

radius = R

distance = s

angle = β

to find out

final speed and the acceleration

solution

we know that cylinder is rolling on inclined plane

so from conservation of mechanical energy

energy at top = energy at bottom

energy at top will be

= m ×g×h

= m ×g×s sinβ ................1

and

energy at bottom will be

= 1/2 ×m × v² + 1/2 × z × ω²

= 1/2 ×m × v² + 1/2 × 1/2 ×m× r² × (v/r)²

= 3/4 × v² .................2

equating now equation 1 and 2

m ×g×s sinβ = 3/4 × v²

so v = 4/3 × g × sin β

so speed is 4/3 × g × sin β

and acceleration is

= mg sin θ ............3

and

acceleration = ma ............4

now equation equation 3 and 4

ma = mg sin θ

so acceleration is g sin θ

5 0

3 years ago

A stone initially moving at 8.0 m/s on a level surface comes to rest due to friction after it travels 11 m. What is the coeffici

Ivenika [448]

Answer:

Coefficient of friction will be 0.296

Explanation:

We have given initial speed of the stone u = 8 m /sec

It comes to rest so final speed v = 0 m /sec

Distance traveled before coming to rest s = 11 m

According to third equation of motion

$v^2=u^2+2as$

So $0^2=8^2+2\times a\times 11$

$a=\frac{-64}{22}=-2.90m/sec^2$

Acceleration due to gravity $g=9.8m/sec^2$

We know that acceleration is given by

$a=\mu g$

So $2.90=9.8\times \mu \\$

$\mu =\frac{2.9}{9.8}=0.296$

So coefficient of friction will be 0.296

3 0

3 years ago

Answer True or False to each case. Coulomb's law states that the force between static charges Q1 and Q2 is K Q1Q2/r2 where K is

Julli [10]

Explanation:

The Coulomb's law states that the force acting on two charges is directly proportional to the product of charges and inversely proportional to the square of distance between them . Mathematically, it is given by

$F=k\dfrac{q_1q_2}{r^2}$

Where

k is the electrostatic constant

q₁ and q₂ are charges

r is the distance between them.

The SI unit of electric force is Newton. It can be attractive or repulsive. The attraction or repulsion depend on charges. If both charges are positive, the force is repulsive and if both are opposite charges, the force is attractive.

4 0

3 years ago