Physics Answers

A force 0f 100 N is directed north on a -20 µC point charge. What is the magnitude and direction of the electric field at this point?

A particle of mass m is constrained to move on

the boundary of an ellipse x^2 + y^2 = 2. Identify

the generalize.d coordinates of this system.

Benzene has a refractive index of 1.43. Suppose a light ray strikes its

surface at an angle of 40°, what is the directions of the reflected and the

refracted rays?

An electric charge q caused an electric potential of V = -218 V at point A 10.6 m from q. What is the electric charge q?

Rectangular plate has a voltage of +180V and another rectangular plate (parallel to

plate to the first plate) has a voltage of -5V. Determine the field strength at any point

between these two plates? The distance of separation of the plates is finite, say 8.6mm

A string is 7.63 m long with a mass of 8.56 g. The string is held taut with a tension of 457 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?

A wave is modeled with the function y(x,t) = (0.8m) cos((1rad/m)x − (0.62rad/s)t + π/3). Find the wave speed.

An insulated cup contains 330 g of water at 20 °C. A 100 g sample of an unknown material at 76 °C is added. The final temperature of the water and metal is 47 °C. 

Specific heat capacity of water = 4160 J/kg-°C

What is the specific heat capacity of the unknown material {_1} J/kg-°C

A body of mass 4 kg, projected at an angle of 65° from the ground with an initial velocity of 36 m/s, acceleration due to gravity is g = 9.81 m/s², determine:

a) time of flight 

b) maximum horizontal distance covered 

c) maximum vertical distance covered 

In a machine, an effort of 50 N lifted a load of 350 N. If effort lost due to friction at this load is 12.5 N. Find

a) Ideal Effort 

b) Mechanical Advantage 

c) Velocity Ratio