What type of wave requires a medium to transfer energy?

Radio

Mechanical

Electromagnetic

Light

Can a twig float on water?

What is the acceleration due to gravity of an object at the surface of mercury? (mercury's mass is 3.3 * 1023 kilograms, and its radius is 2,439,000 meters.) ?

a race car driver must average 203 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 199.0 km/h what average speed must be maintained for the last lap?

A light-year is about?

56 kg girl slides down the frictionless slip-n-slide at a constant speed of 35 m/s. What is the kinetic energy in Joules of the girl?

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?