Physics Answers

You use 8,000 joules of energy climbing a hill. The climb takes you 50 seconds. How much power did you exert?

Consider a soot particle of mass m_soot = 1.0 nanogram (=1.0 x 10^-9 g = 1.0 x 10^-12 kg), which corresponds to a diameter of a few microns. Some number of electrons have been added to give the particle a total charge q_soot, suppose the collector has a total charge of q_collector = 1.0 x 10^-6 C and is small enough to be treated as a point charge at the rim of the smokestack. (a) if the separation between the collector and the soot particle is r = 0.10 m, what is the value of q_soot so that the electric force exerted on the particle is equal to its weight? (b) How many electrons must be added to the soot particle?

A watervpump lifts water from a level 10 m below the ground. Water is pumped at a rate of 30kg/minute with negligible velocity and friction. Calculate the minimum horsepower the engine should have for this? Use g=9.8 m/s^2

Determine the curl of F which is (∇ × F ) at the point (2, 0, 3) given that

F = ze2xy i + 2xz cosy j+ (x + 2y)k

We have a horizontal spring with a mass attached oscillating with a maximum displacement of A on either side. At which intermediate displacement(s) the kinetic energy would equal the potential energy

A particle starts from rest and moves in a straight line with constant acceleration passing two points A and B, which are 100m apart in 15s. If the velocity of the particle at B is three times its velocity at A, find: (a) the velocity of the particle at A; (b) its acceleration; (c) the distance of A from the starting point.

Find the unit tangent vector, the unit normal vector, the curvature and the radius of curvature of the circle x= a cos theta, y= a sin theta, z=0 at point with parameter theta.

If a potential is given by ax^3+bx+c then what is the condition for equilibrium

A particle has charge -3.00 nC. (a) Find the magnitude

nd direction of the electric field due to this particle at a point

.250 m directly above it. (b) At what distance from this particle

pes its electric field have a magnitude of 12.0 N/C?

1. The electric force between two point charges with a magnitude of 800uC and 900uC is 15 N. How far apart are the two charges in cm?

2. A force of 500 N between two identical point charges is separated by a distance of 47m. Calculate the magnitude of the two point charges.