A cobalt atom contains 27 protons, 32 neutrons, and 27 electrons. What is

an ice Puck travels 18 m in 3 S before it slides into the goal what is the speed of the traveling puck

DiKsa [7]

Answer:

$\boxed {\boxed {\sf 6 \ meters \ per \ second}}$

Explanation:

Speed can be found by dividing the distance by the time.

$s=\frac{d}{t}$

The distance is 18 meters and the time is 3 seconds.

$d= 18 \ m \\t= 3 \ s\\$

Substitute the values into the formula.

$s=\frac{18 \ m }{ 3 \ s }$

Divide.

$s= 6 \ m/s$

The speed of the puck is <u>6 meters per second.</u>

4 0

2 years ago

Read 2 more answers

9) A bug of mass 0.020 kg is at rest on the edge of a solid cylindrical disk (M = 0.10 kg, R = 0.10 m) rotating in a horizontal

natima [27]

Answer:

a. ω₂ = 14rad/s

b. ∇K.E = 0.014J

c. The bug does not conserve force while moving on the disk (non-conservative force).

Explanation:

Mass of the bug (m) = 0.02kg

Mass of the cylindrical disk (M) = 0.10kg

Radius of the disk (r) = 0.10m

Initial angular velocity ω₁ = 10rad/s

final angular velocity ω₂ = ?

a.

To calculate the new angular velocity, we relate it to the conservation of angular momentum of the system I.e when the bug was at the edge of the disk and when it is located at the centre of the disk.

I = Mr² / 2

I₁ = Mr₂ / 2 + mr²

I₁ = moment of inertia when the bug was at the edge

I₁ = [(0.10 * 0.10²) / 2 ] + (0.02 * 0.1²)

I₁ = 0.0005 + 0.0002

I₁ = 7.0*10⁻⁴kgm²

I₂ = moment of inertia when yhe bug was at the center of the disk.

I₂ = Mr² / 2

I₂ = (0.01 * 0.01²) 2

I₂ = 0.0005kgm²

for conservation of angular momentum,

I₁ω₁ = I₂ω₂

solve for ω₂

ω₂ = (I₁ * ω₁) / I₂

ω₂ = (7.0*10⁻⁴ * 10) / 5.0*10⁻⁴

ω₂ = 14 rad/s

b. the change in kinetic energy of the system is

∇K = K₂ - K₁

∇K = ½I₂*ω₂² - ½I₁*ω₁²

∇K = ½(I₂*ω₂² - I₁ω₁²)

∇K = ½[(5.0*10⁻⁴ * 14²) - (7.0*10⁻⁴ * 10²)]

∇k = ½(0.098 - 0.07)

∇K = ½ * 0.028

∇K = 0.014J

c.

The cause of the decrease and increase in kinetic energy is because the bug uses a non-conservative force. To conserve the mechanical energy of a system, all the forces acting in it must be conservative.

The work W produced by this force brings the difference in kinetic energy of the system

W = K₂ - K₁

6 0

3 years ago

The angle of incidence is the angle between the incident ray and the:

kirill115 [55]

The angle of incidence is the angle between the incident ray and the normal.

<u>Explanation:</u>

In attached diagram, a light ray approaching the mirror is known as an incident ray (I) whereas the light beam coming out of the mirror is called the reflected ray (R). At the intersection where the beam meets the mirror, you can draw a line perpendicular to the mirror surface.

This line is called as the normal (N) line. Normal divides the angle between the incident and the reflected rays into two equal angle. The angles between the incident and normal beam is called the incidence angle ( $\theta_{i}$ ). The angle between the reflected beam and the normal one is called the reflection angle( $\theta_{r}$ ).

4 0

3 years ago

Urgent!!!! Timed quiz. Calculate the velocity of the pink car.

dem82 [27]

Answer:

Option A

20 m/s

Explanation:

From the law of conservation of linear momentum, the sum of momentum before and after collision equals zero hence for this case also, the sum of momentum of the two cars before collision should be equal to momentum after collision.

Momentum is given as the product of mass and velocity, where velocity considers the direction. Momentum, p=mv where m is the mass of the object and v is the velocity.

Momentum before collision

Since the velocities of both cars before collision are zero hence their momentum are zero ie 0.5*0+(1*0)=0

Momentum after collision

For 0.5 Kg car, its momentum will be 0.5*-40=-20 Kg.m/s

For the 1 kg car its momentum will be 1*v=1v

v-20=0

v=20 m/s

3 0

3 years ago

A parallel-plate capacitor has an area of

nikdorinn [45]

Answer: what

Explanation:

6 0

3 years ago