**Answer:**

No, the sound produced by screeching brakes is not a useful form of energy, because it does not contribute to stopping the car.

**Answer:**

Maximum torque on the wire is

**Explanation:**

It is given that,

Diameter of the wire, d = 11.1 cm = 0.111 m

Radius of wire, r = 0.0555 m

Magnetic field,

Current, I = 5 A

We need to find the maximum torque on the wire. Torque is given by :

**Torque is maximum when,**

or

**So, the maximum toque on the wire is . Hence, this is the required solution.**

**Answer:**

Chemical potential energy

**Explanation:**

Because you utilize the energy in ur body obtained from eating to throw the football. Thus chemical potential energy

Refer to the diagram below.

Let A = the starting point.

Let B = the destination.

Let travel east be positive, and travel west be negative.

Then the total travel is

8 - 3 + 13 = 18 km

Answer: 18 km

**Explanation:**

Escape velocity is the point at which the kinetic energy is equal to the gravitational potential energy.

KE = PE

½ mv² = mgh

½ mv² = m (GM/r²) (r)

½ mv² = GMm/r

½ v² = GM/r

v = √(2GM/r)

The escape velocity is independent of the mass of the spacecraft. So the escape velocity will be the same for both X and Y.