Which statement describes the forces acting on a pencil resting on a desk? A.
The force of gravity pushes up on the pencil, while the desk provides a balanced force pushing down.

B.
The force of gravity pushes down on the pencil, while the desk provides a balanced force pushing up.

C.
The force of gravity pushes up on the pencil, while the desk provides an unbalanced force pushing down.

D.
The force of gravity pushes down on the pencil, while the desk provides an unbalanced force pushing up.

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?

Need this now! do pilots live long

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass