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4 years ago

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disk mass 2kg sliding on smooth surface velocit 5m/s when it strikes 4kg disk b sliding forward at 2m/s. direct cnetral impact C

oefficient of restitution is 0.4. compute velocities after

1 answer:

jonny [76]4 years ago

8 0

Explanation:

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10.0-g wad of sticky clay is hurled horizontally at a 110-g wooden block initially at rest on a horizontal surface. The clay sti

Iteru [2.4K]

Answer:

v₁ = 1146.6 m / s

Explanation:

This problem must be solved in two parts, a first part of the crash or another with energy after the crash.

Let's start by analyzing the crash.

Definition the system as formed by the clay block and the wooden block, in this case the moment is conserved because the forces are of action and reaction type

Let's use subscript 1 for the clay block and subscript 2 for the wood block

Initial. Before the crash

p₀. = m₁ v₁

Final. Right after the crash

$p_{f}$ = (m₁ + m₂) v

p₀ = p_{f}

m₁ v₁ = (m₁ + m₂) v

v₁ = v (m₁ + m₂) / m₁

Now the body is formed by the joint of the plug + the wooden block

W = ΔK

-fr x = Kf - K₀

The final velocity is zero, so the final kinetic energy is zero

The equation for friction force is

fr = μ N

From Newton's second law, on the horizontal surface

N- W = 0

N = (m₁ + m₂) g

fr = μ (m₁ + m₂) g

We substitute

- μ (m₁ + m₂) g x = 0 - ½ (m₁ + m₂) v

v = 2 μ g x

v = 2 0.650 9.8 7.50

v = 95.55 m / s

We substitute in the moment equation

v₁ = v (m₁ + m₂) / m₁

v₁ = 95.55 (10 + 110) / 10

v₁ = 1146.6 m / s

4 0

3 years ago

Which statement best describes the atoms in a solid?

k0ka [10]

<span>A solid formed is described when its resistance is tightly secured, and when it refuses to change shapes. It is one of the four fundamental elements. The best answer would be: The atoms are packed together and cannot move around.</span>

3 0

3 years ago

Read 2 more answers

Two long, straight parallel wires 8.2 cm apart carry currents of equal magnitude I. The parallel wires repel each other with a f

o-na [289]

Answer:

36.22 mA

Explanation:

i1 = I , i2 = I, d = 8.2 cm = 0.082 m

Force per unit length = 3.2 nN/m = 3.2 x 10^-9 N/m

μo = 4 π × 10^-7 Tm/A

The formula for the force per unit length between the two wires is given by

F = μo / 4π x (2 i1 x i2) / d

3.2 x 10^-9 = 10^-7 x 2 x I^2 / 0.082

I = 0.0362 A = 36.22 mA

4 0

4 years ago

An electron moves north at a velocity of 4.5 × 104 m/s and has a magnetic force of 7.2 × 10-18 n exerted on it. if the magnetic

Mice21 [21]

The magnetic force on a moving charge is given by:

$F=qvB \sin \theta$

where q is the charge, v is the speed of the charge, B is the magnetic field intensity and $\theta$ is the angle between the directions of B and v.

In our problem, the charge is an electron ( $q=1.6 \cdot 10^{-19}C$ ), the velocity of the charge is $v=4.5 \cdot 10^4 m/s$ , the magnetic force is $F=7.2 \cdot 10^{-18} N$ and the angle between the direction of v and B is $\theta=90^{\circ}$ , so $\sin \theta=1$ and we can ignore the sine in the formula. Therefore, if we rearrange the equation and we put these numbers in, we can find the intensity of the magnetic field:

$B=\frac{F}{qv}=\frac{7.2 \cdot 10^{-18} N}{(1.6 \cdot 10^{-19}C)(4.5 \cdot 10^{-4} m/s)}=0.001 T$

8 0

4 years ago

a backpack has a mass of 8 kg. it is lifted and given 54.9 J of gravitational potential energy. how high is is lifted? accelerat

dalvyx [7]

P=mgh
h=P/mg
h=(54.9)/(8*9.8)= 0.7m

8 0

3 years ago