Name the structure marked by letter “A”  

What is the causative agent of syphilis?

Name this plane of section:  

The arms of a U-shaped tube have circular cross-sections. A lid that seals the wider arm requires a force of 45 N to remove it. The tube is filled with water and the narrow arm is fitted with a piston. If the maximum amount of force you can apply with your hand to the piston is 17 N, what is the minimum ratio of the diameters in the tube dbig/dnarrow in order for you to be able to pop out the lid?

The plot below shows a mass oscillating with Simple Harmonic Motion, following x = xm cos (ωt + φ). What are the period T and phase φ?

An object of mass 4 kg and volume 0.003 m3 is submerged in water (with density of 1000 kg/m3) and then released. What will be the initial acceleration of the object in m/s2? Assume downwards to be the positive direction.

What is a bond?

Consider a spherical planet of radius 3000 km where the gravitational acceleration on the surface is 4 m/s2. A satellite orbiting this planet has a period of 3 hours. What is the radius of the orbit of the satellite?

Name the organelle (marked “A”) and in detail describe its function in the cell (a short paragraph).

Two satellites are in circular orbits around the Earth. Satellite A orbits with three times the velocity of satellite B. What is the ratio of satellite B’s orbital radius to that of satellite A, rB/rA?