The velocity vector v1 has a magnitude of 4.0 m/s and is directed along the +x-axis. the velocity vector v2 has a magnitude of 3.0 m/s. the sum of the two is v3, so that v3 = v1+v2. which of the following are true: a. the magnitude of v3 can be 7.0 m/s. b. the magnitude of v3 can be -5.0 m/s. c. the magnitude of v3 can be 3.0 m/s. d. the magnitude of v3 can be 0.0. e. the x-component of v3 can be 4.0 m/s. f. the magnitude of v3 can be 8.0 m/s

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

What are the north and south poles of a solenoid change with?

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g