Everything is in the pic.

3)A mass of 4 kg rests on a horizontal plane. The plane is gradually inclined until at an angle o=15° with the horizontal, the m

Veronika [31]

Answer:

A mass of 4 Kg rest on the horizontal plane. The plane is gradually inclined until at an angle of θ=15

∘

with the horizontal,the mass just being to slide what is the coffeficient of static friction between the block & the surface.

Explanation:

7 0

3 years ago

An object slides on a level surface in the +x direction. It slows and comes to a stop with a constant acceleration of -2.45 m/s2

Stolb23 [73]

Answer:

uk = 0.25

Explanation:

Given:-

- An object comes to stop with acceleration, a = -2.45 m/s^2

Find:-

What is the coefficient of kinetic friction between the object and the floor?

Solution:-

- Assuming the object has mass (m) that slides over a rough surface with coefficient of kinetic friction (uk). There is only Frictional force (Ff) acting in the horizontal axis on the object opposing the motion (-x direction).

- We will apply equilibrium equation on the object in vertical direction.

N - m*g = 0

N = m*g

Where, N : Contact force exerted by the surface on the floor

g : Gravitational acceleration constant = 9.81 m/s^2

- Now apply Newton's second law of motion in the horizontal ( x-direction ):

- Ff = m*a

- The frictional force is related to contact force (N) by the following expression:

Ff = uk*N

- Substitute the 1st and 3rd expressions in the 2nd equation:

uk*m*g = -m*a

uk = a / g

- Plug in the values and solve for uk:

uk = - (-2.45) / 9.81

uk = 0.25

8 0

3 years ago

An ideal transformer has 60 turns in its primary coil and 360 turns in its secondary coil. If the input rms voltage for the 60-t

Ber [7]

Answer:

Voltage of the secondary coil is 720 volts.

Explanation:

Number of turns in primary coil, N₁ = 60

Number of turns in secondary coil, N₂ = 360

Input rms voltage of primary coil, V₁ = 120 V

We have to find the output rms voltage of the secondary coil. The relationship between the number of coil and voltage is given by :

$\dfrac{N_1}{N_2}=\dfrac{V_1}{V_2}$

$\dfrac{60}{360}=\dfrac{120}{V_2}$

V₂ = output rms voltage of the secondary coil.

After solving above equation, we get :

V₂ = 720 V

Hence, the output rms voltage of the secondary coil is 720 volts.

4 0

4 years ago

A boy at a football field practice kicked a 0.500-kg ball with a force of 100N. How fast will the ball move after reaching a dis

Tpy6a [65]

Answer:

v(7) = 52.915 m/s

Explanation:

First, find the value for acceleration.

F = ma

100 = .5 * a

a = 200 m/s²

Next find the velocity at x = 7 using kinematic equations.

v² = v₀² + 2a(Δx)

v² = (0)² + 2(200)(7)

v = $\sqrt{2800}$

v = 52.915 m/s

3 0

3 years ago

A child with a mass of 20 kg sits at a distance of 2 m from the pivot point of a seesaw. where should a 16-kg child sit to balan

Maksim231197 [3]

In the above problem, we need to find mass of the second child, so that the Center of Mass remains at the origin( pivot).

CM= m1r1+m2r2/m1+m2
0= 20*-2+16*r2/20+16
r2= 40/16
r2= +2.5 m

4 0

3 years ago