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.