A charge of +0.009 Coulombs is separated by a distance 57 m from a charge of +0.061 Coulombs. What is the force between the charges in Newtons? The Coulomb force constant is 9x10⁹ in standard units.

a.1520 repulsive

b.1520 attractive

c.8.67e4 repulsive

d.4.94e6 repulsive

e.8.67e4 attractive

A ships captain notices that the ship goes from the top of a wave to the bottom and back up again once every 3 seconds. The captain also notices that the crests of the waves are about 19.8 m apart. What is the wave speed in meter per second ?

a.6.60

b.59.4

c.19.8

d.0.152

On a cold windy day when the outside air temperature is 10^o C and the wind chill factor is -10^o C, you feel colder than 10^o C because of:

Select one:

a.

conduction

b.the high specific heat of air

c.

convection

d.

radiation

You're in a park listening to a concert that's 99 m away. The music is faint, and you want the sound intensity to be a factor of 4 times higher. How far from the stage do you need to be?

a.198

b.49.5

c.70.2

d.24.8