A+6.00 μc point charge is moving at a constant 9.00 ×10^6m/s in the + y-direction, relative to a reference frame.
at the instant when the point charge is at the origin of this reference frame, what is the magnetic field b it produces at the following points?

a) x=0.500m, y=0, z=0
b) x=0, y=-0.500m, z=0
c) x=0, y=0, z=+0.500m
d) x=0, y=-0.500m, z=+0.500m

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration