Which of the following can occur by conduction?

a. transfer of heat from the sun

b. transfer of heat through air

c. transfer of heat through space

d. transfer of heat through a liquid

The time period from one moon to the next is called a?

A rocket takes off from Earth's surface, accelerating straight up at 31.2 m/s2. Calculate the normal force (in N) acting on an astronaut of mass 85.9 kg, including his space suit. (Assume the rocket's initial motion parallel to the y-direction.

The frequency of a wave is 560 Hz. What is it's period

When does a roller coaster have the most kinetic energy

What are the first organisims to live within a newly created patch of land

A gate in an irrigation canal is constructed in the form of a trapezoid 2 m wide at the bottom, 38 m wide at the top, and 2 m high. It is placed vertically in the canal so that the water just covers the gate.

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment