q1 a 280 block on a 500 -long string swings in a

Question

Q1. A 280 block on a 50.0 -long string swings in a circle on a horizontal, frictionless table at 80.0.

What is the speed of the block?

What is the tension in the string?

Q2. Find the flux of the Earth's magnetic field of magnitude 6.00 10-5 T through a square loop of area 30.0 cm2

(a) when the field is vertical to the plane of loop,

(b) when the field makes a 60.0 angle with the normal to the plane of loop, and

(c) when the field makes a 90.0 angle with the normal to plane.