Four masses are suspended on weithless strings as shown below The tension T1 in the top string is
2 points
T1 = m1+m2+m3+m4
T1 =( m1+m2+m3+m4)g
T1 = m1*g
none of the above
Other:

The tension in the second from top string is *
2 points
T2 =( m1+m2+m3+m4)g
T2 =( m2+m3+m4)g
T2 =( m1+m2)g
T1 =( m1)g

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

What is the magnitude of the gravitational force acting on the earth due to the sun?

)consider two positively charged particles, one of charge q0 (particle 0) fixed at the origin, and another of charge q1 (particle 1) fixed on the y-axis at (0,d1,0). what is the net force f⃗ on particle 0 due to particle 1?