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lisabon 2012
7 days ago
13

To practice Problem-Solving Strategy 10.1 for energy conservation problems. A sled is being held at rest on a slope that makes a

n angle θ with the horizontal. After the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. Find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.
Physics
1 answer:
serg [3.2K]7 days ago
5 0
μk = (d1)sin(θ) / [(cosθ)(d1) + (d2)]. According to the work/energy theorem, the change in kinetic energy of an object is equal to the total work done by all forces on it. As the object starts and ends at rest, the change in kinetic energy is zero, which indicates that the cumulative work done must also equal zero.
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Two objects are placed in thermal contact and are allowed to come to equilibrium in isolation. The heat capacity of Object A is
kicyunya [2911]
Heat capacity of A is three times that of B

and the initial temperature for A is twice that of B

with TA = 2 TB

Let T denote the final temperature of the system.

The heat lost by A equals the heat gained by B:

mass of A x specific heat of A x (TA - T) = mass of B x specific heat of B x ( T - TB)

which simplifies to heat capacity of A x ( TA - T) = heat capacity of B x ( T - TB)

resulting in 3 x heat capacity of B x ( TA - T) = heat capacity of B x ( T - TB).

This leads us to the equation: 3 TA - 3 T = T - TB

which rearranges to yield 6 TB + TB = 4 T

thus giving us T = 1.75 TB

8 0
16 days ago
The amount of energy necessary to remove an electron from an atom is a quantity called the ionization energy, Ei. This energy ca
Keith_Richards [2897]

Answer:

The resulting value is E_i = 1.5596 *10^{-18} \ J.

Explanation:

The question specifies that

The wavelength is \lambda = 48.2 nm = 48.2 *10^{- 9 }\ m.

The velocity is v = 2.371*10^6 \ m/s.

The mass of the electron is m_e = 9.109*10^{-31} \ kg.

The energy of the incoming light is typically depicted mathematically as

E = \frac{h * c}{\lambda}.

Here, c represents the speed of light with the value c = 3.0 *10^{8} \ m/s.

h stands for Planck's constant with a value of h = 6.62607015 * 10^{-34 } J\cdot s.

Thus,

E = \frac{6.62607015 * 10^{-34 }* 3.0 *10^{8}}{48.2 *10^{- 9 }}

=> E = 4.12 *10^{-18} \ J.

Typically, kinetic energy is represented as

E_k = \frac{1}{2} * m_e * v^2

=> E_k = \frac{1}{2} * 9.109*10^{-31} * (2.371*10^6 )^2.

=> E_k = 2.56 *0^{-18} \ J.

The ionization energy is generally expressed mathematically as

E_i = 4.12 *10^{-18} - 2.56 *0^{-18}

=> E_i = 1.5596 *10^{-18} \ J.

8 0
1 month ago
HELP !! Maura is deciding which hose to use to water her outdoor plants. Maura noticed that the water coming out of her garden h
Yuliya22 [2962]
THE GREEN HOSE: Define the (x,y) coordinates at a height of 4 feet, which corresponds to where Majra holds the green hose. This indicates the equation for the green hose takes the form y = a(x - h)² + 4. Water from the hose lands on the ground 10 feet away from Majra, thus y(10) = -4. Given that the curve passes through (0,0), this leads to ah² + 4 = 0; therefore, ah² = -4. To satisfy the previous equation, we find a(10 - h)² + 4 = -4, simplifying to a(10 - h)² = -8. Dividing (3) by (4) gives a ratio of h²/(10-h)² = 1/2, leading to 2h² = (10 - h)² = 100 - 20h + h², and resolving yields h² + 20h - 100 = 0. Applying the quadratic formula, we get x = 0.5[-20 +/- √(8400)] = 4.142, - 24.142. We discard the negative solution. The vertex locates at (4.142, 4). From (3), we deduce a = -4/4.142² = -0.2332, leading to the equation for the green hose: y = 0.2332(x - 4.142)² + 4. THE RED HOSE: The vertex of the red hose is positioned at (3,7), represented by the equation y = -(x-3)² + 7. A graph depicting y(x) for both hoses is included in the attached figure. Answers: a. The red hose throws water higher. b. The green hose's equation is y = -0.2332(x - 4.124)² + 4, starting at a height of 4 feet. c. The feasible domain for the green hose is between 0 ≤ x ≤ 10 feet, with the corresponding range being -4 ≤ y ≤ 4 feet.
3 0
19 days ago
A uniform magnetic field makes an angle of 30o with the z axis. If the magnetic flux through a 1.0 m2 portion of the xy plane is
Yuliya22 [2962]

Response:

(b) 10 Wb

Clarification:

Given;

angle of the magnetic field, θ = 30°

initial area of the plane, A₁ = 1 m²

initial magnetic flux through the plane, Φ₁ = 5.0 Wb

The equation for magnetic flux is;

Φ = BACosθ

where;

B denotes the magnetic field strength

A represents the area of the plane

θ is the inclination angle

Φ₁ = BA₁Cosθ

5 = B(1 x cos30)

B = 5/(cos30)

B = 5.7735 T

Next, calculate the magnetic flux through a 2.0 m² section of the same plane:

Φ₂ = BA₂Cosθ

Φ₂ = 5.7735 x 2 x cos30

Φ₂ = 10 Wb

<pHence, the magnetic flux through a 2.0 m² area of the same plane is 10 Wb.

Option "b"

3 0
1 month ago
A 2.0 kg bird lands on a 1.0 x 10^1 kg bit of tree bark sitting on a frictionless ice-covered pond. The bird’s initial horizonta
ValentinkaMS [3084]
In this scenario, the principles of momentum conservation can be applied since there are no external forces acting on the system. Consequently, the conservation of momentum principle is applicable here. After the bird lands on it, both the bird and the bark will have a unified final speed. Thus, this final speed will be 1 m/s.
7 0
8 days ago
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