. A person attempts to cross a river in a straight line by navigating a boat at 15m/s. If the river flows at 5.0m/s from his left to right, what would be the magnitude of the boat's resultant velocity? In what direction would the boat go, relative to the straight line across it?

The magnitude and the direction the boat go, relative to the straight line

across it is 15.81 m/s and 18⁰ respectively.

= √ ( 15² + 5² )

= √ ( 225  + 25 )

= √250

= 15.81 m/s

If boat makes angle θ with direction of flow of river

Tanθ = 15/5 = 3

θ = 72⁰ approx.

Angle with straight line across it = 90 - 72 = 18⁰

Read more about Magnitude here link

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is