A wave pulse travels along a horizontal string. As the pulse passes a pint on the string, the point moves vertically up and then back down again. How does the vertical speed of the point compare to the speed of the wave?

• the speed of the point equals the speed multiplied by the wavelength and divided by the string's length.
• the wave speed equals the point speed multiplies by the wavelength and divided by the string's length.
• the speed of the point is 2 times greater than the wave speed.
• the speed of the point could be neglected compared to the wave speed.
• the wave speed could be neglected compared to the speed of the point.
• the speeds could not be uniquely compared, because there is no fixed relationship between them.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

  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

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.