Physics Answers

What is the wavelength of EM radiation that ejects 2.00 -eV electrons from calcium metal, given that the binding energy is 2.71 eV? What type of EM radiation is this?

The temperature of 47 degree celsius was recorded as the highest temperature in Thailand in 52 years. What is the temperature in Kelvin

If you push against a stationary car, are you doing any work?

. A man lifts a box weighing 56N through a vertical height 1.3 m and then walks horizontally for 2.2 m at constant speed while holding the box. What is the work done by the student? *

The steel rail road track is 20 cm long at 10 degree celsius. How much longer is the track at 20 degree celsius? The coefficient of linear expansion of steel is 1.27x10-5 -K.

Dindy of mass 48 kg wears heels with an area of 2 cm² in contact with ground. Calculate the

pressure exerted by the girl on the ground.

A copper wire is 2.50 m long and has a diameter of 2.5 mm. How much current will it draw when connected to a 3.0 V source?

What is the mass of a lead sphere whose diameter is 0.50 m given density of steel is 7800 kg/m3 ?

A 0.25-kg mass at the end of a spring oscillates 2.2 times per second with an amplitude of 0.15 m. Determine (a) the speed when it passes the equilibrium point, (b) the speed when it is 0.10 m from equilibrium, (c) the total energy of the system, and (d) the equation describing the motion of the mass, assuming that at t=0, x was a maximum.

1.  Three charged particles are arranged in a line as shown in figure below. Charge A = -5 μC, charge B = +10 μC and charge C = -12 μC.  

a.  Calculate the net electrostatic force on particle A due to the other two charges.

b.  Calculate the net electrostatic force on particle B due to the other two charges.

c.   Calculate the net electrostatic force on particle C due to the other two charges