Answer
given,
Weight of the child = 110 N
length of the swing,L = 2 m
now, calculating the potential energy when the string is horizontal
Potential energy = m g h
now, h = L (1 - cos θ) where θ is the angle made by the string with the vertical.
PE = m g L (1 - cos θ)
when rope is horizontal θ = 90°
PE = 110 x 2 (1 - cos 90°)
PE = 220 J
now, calculating potential energy when string made 25° with horizontal
PE = m g L (1 - cos θ)
when rope is horizontal θ = 25°
PE = 110 x 2 (1 - cos 25°)
PE = 20.61 J
Answer:
The net magnetic flux through the rest of Earth's surface is 
Explanation:
Given that,
Magnetic field = 42 μT
Area 

We need to calculate the flux per unit area

We need to calculate the total earth's surface area



We need to calculate the rest of earth's area

Put the value into the formula


We need to calculate the net magnetic flux through the rest of Earth's surface


Hence, The net magnetic flux through the rest of Earth's surface is 
Force = mass x acceleration
113N = 25.2a
a = 4.48 m/s^2
Vf = Vi + at
Vf = 2.33 + 4.48(2) = 11.3 m/s
Answer with Explanation:
We are given that
a.Linear acceleration,a=0.1 g
Moment of inertia of solid sphere,
We know that

Using the formula




b.When a frictionless block were to slide down the incline at that angle then the motion of block will be linear .There is no rotation.
When the sphere is moving without rotation then, the linear speed of sphere will be larger.
When the linear speed is larger then, the linear acceleration will be larger.
Hence, the magnitude of acceleration will be more.
Answer:
A.
The balls stick and move together.
Explanation:
When a bodies undergo perfectly inelastic collision, the two bodies stick together after the collision and begins to move.
In this collision, kinetic energy is not conserved. For perfectly elastic collision, the two bodies conserve kinetic energy and begin to move apart.
Kinetic energy is not conserved because some of the energy gets converted into other forms of energy.