A proton is moving at 2.20 km/s in the x direction. in a vector magnetic field B = 3.0x10^-5 T I - 2.1x10^-5 T j - 6.7x10^-5 T K.

a. 0.214 N
b. 2.36 x 10^-20 N
c. 7.40 x 10^-21 N
d. 2.47 x 10 ^-20 N

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2. how much is the spring compressed x from its natural length? 1) x = v0*sqrt(k/(mg)) 2) x=v0*sqrt(m/k) 3) x=v0*((mk)/g) 4) x=v0*sqrt(k/m) 5) x=v0*(m/kg) 6) x=v0*sqrt((mg)/k) 7) x=(v0)^2/(2g) 8) x=v0*(k/(mg)) 9) x=(v0)^2/(2m) 10) x=v0*((mg)/k)